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25C-012 North Street Tofino NOI and stormwater Condos<~ `~--1 ~ ~ ~~ !. City ofNorthampton--Wetlands Application This form is required for all applications filed under the Northampton Wetlands Ordinance File with the Office of Planning and Development, 2I0 Main Street, Northampton, MA OI060 We ~°ecommend applicants consult with the Land Use and Conservation Planner (587-1263) before applying 1. Check what kind of permit you are requesting ^ Request for Determination of Applicability (WPA form 1) ® Notice of Intent (WPA form 3) ^ Abbreviated Notice of Resource Area Delineation (WPA form 4A) 2. Property Street Address: $ V i ~E'.tu ~-v ehue, a~ of No ~'-I~her'y~ ~~V~fy~.taf.. 3. Assessors' Map and Parcel: Z~G -~ 12 Second lot (if any) Map and Parcel(s): 25 G -~ ~~ Additional property 4. Check the items enclosed. Your application will not be accepted if any items are missing. .© The appropriate completed Massachusetts DEP application http://www.mass. gov/dep/water/approvals/wwforms.htm ® Completed versions of this Wetlands Application ® Nine (9) copies of the fully completed and collated application packages (forms, plans and attachments) © All plans folded (not rolled) and collated with each application packet ® For Notice of Intent applications only, submit the.following: ® Appropriate Notice of Intent Conservation Commission Fees http://www.northamptonma. eov/opd/uploads/IistW id~et/2533/opd%20fees.pdf ~ An abutters list of all property owners within at least 100 feet of the property line of your project. Abutters lists may be generated at www.NorthamptonMA.gov/opd (click on Database: Abutters, Permits and Historic). Computers are available at City Hall, Forbes and Lilly Libraries. ^ For Request for Determination applications, appropriate Request for Determination of Applicability Fees http://www.northa~tonma. Gov/opd/uploads/listW id~et/2533/opd%20fees.pdf ^ For Notice of Resource Area Delineation use Notice of Intent Fee http://www.northamptonma.~ov/opd/uploads/IistW idget/2533/opd%20fees.pdf 0 A #10 business envelope addressed to the applicant. 5. Provide an Existing Conditions Site Plan. Check the items shown on that plan. You may request a waiver from submittal requirements, with a reason for the waiver request. Q Boundary of entire lot and notation of lot area N~Pc ^ . Context of adjacent lots, if necessary to show extent of wetland/Riverfront Area 0. Numbered wetland flags NSA ^ Existing and potential vernal pools ® 50' AND 100' wetland buffer g 3g' b u~eY t~l~A ^ Mean Annual High Water line, for Riverfront Area permits ~/A ^ 100' inner riparian zone AND 200' outer riparian zone, for Riverfront Area permits ^ Existing structures, impervious surfaces (ie: pavement, gravel) and lawn areas 0 Edge of vegetation accurately measured or surveyed ~L7 Significant (8"+ Diameter Breast Height) trees within the limit of work area that are also within the 200' Riverfront Area, Bordering Vegetated Wetland, or 100' wetland buffer ~ 2' contours N/1~, ^ Elevations in feet (not meters), for projects within the floodplain ® Zoning setbacks ^ 1:20 scale, if possible ~ ~~ \ . ~~~ nd 6. If new work is proposed, provide a Proposed Site Plan. Check the items shown on that plan. You may request a waiver from submittal requirements, with a reason for the waiver request. ® Grading/proposed new contours ~ Hardscape (i.e.: footprint of house, driveway, walkways, terraces, etc...) ~ Any removal of vegetation and significant trees within the Riverfront Area, wetland and buffer ® Landscaping and plantings within the Riverfront Area, wetland and wetland buffer © Location of erosion control barrier © Limit of work line ~ Utility lines ® Stormwater Management Form (use DEP form www.mass.~ov/dep/brp/ww/wwforms.htm), if required N/A ^ Wildlife assessment if the site is in a habitat resource area based on NHESP maps, Northampton Potential and Certified Vernal Pools Map or otherwise required by the Actor Ordinance. 0 At the same scale as the Existing Conditions Site Plan N /~. ^ For new homes in the Riverfront Area only, documentation of the date the lot was recorded. 7. We have provided and requested information and believe and understand that (initial each item below): (~ Application deadline is one calendar month prior to a public hearing. If the application is incomplete or waivers are requested, however, the public hearing may be delayed; <' t~-- We will check for the date and time of our public hearing at www.NorthamptonMA.sov or in the Daily Hampshire Gazette Legal Ads section. Such notice is posted seven days prior to the public hearing; lye---- The Conservation Commission may request an alternatives analysis for work proposed within the buffer V zone of a wetland; The Conservation Commission and their representatives have permission to enter the property; ~v-- All documents and plans submitted are in the public domain and may be copied freely in any form; and ll The City will record Orders of Conditions and Order of Resource Area Delineations at the Hampshire ~ County Registry of Deeds. 8. PLEASE COMPLETE ONLY IF APPLYING FOR A NOTICE OF INTENT or ABBREVIATED NOTICE OF RESOURCE ARE DELINEATION: We certify under the pains and penalties of perjury, that PRIOR to filing this application all abutters were notified of this application pursuant to the requirements of M.G.L. c. 131 § 40. Notice must be made in writing by hand delivery or certified mail return receipt requested) to all abutters within 100 feet of the property line of the project location. ~o~ino ASSOC.ia~tS ~Znc. and ~~- Applicant (print or type):~e nr-k4~er~ ~iK.. ~nnoes~Tn~.. Applicant Signature: Address: ~I G~,yyLbu.S 1~la~.a. ~3 -~c+c~ ~z~! Applicant Phone: `L56 ° 3 Owner (print or type): Owner Signature: Address: Owner Phone: Date submitted: ~ ~ - I y " Dg The Northampton Conservation Commission generally meets on the 2"d and 4th Thursdays of each month in Hearing Room 181ocated on the 2"d floor of City Hall, 210 Main Street Page 2 of 2 ~~ ~ ~~ ~ _~ _ , ,- NOTICE OF INTENT NORTH STREET CONDOMINIUMS PROJECT NARRATIVE This Notice of Intent is being submitted to the Northampton Conservation Commission for the construction of a 25-unit townhouse condominium project, with associated roadway and stormwater management system, on property consisting of 2 parcels totaling approximately 5.6 acres, located'/2 mile from downtown. Existing Conditions The property is located off View Avenue, a private way off North Street owned by the applicant, and off the end of Northern Avenue. There is an intermittent stream that flows from the Industrial Park on the north, through a culvert under the new bike path. The stream is also fed by the storm drain system on Northern Avenue, which flows into the swale adjacent to the bike path. There are bordering vegetated wetlands associated with the intermittent stream. The property slopes gradually and drains toward the BVW. The wetland and areas of upland within the wetland have some significant native trees, but there are many invasive plant species in the area, including multi-flora rose, honeysuckle, and poison ivy. The adjacent uplands are also degraded by historic filling, masonry and other construction and road building debris. The property has an existing house near View Avenue, for which a demolition permit has already been obtained. The house is surrounded by lawn, with a low stone wall at the edge of a portion of the lawn, and a plantation of non-native Norway Spruces beyond the lawn. Proposed Work The proposed project consists of a duplex on Northern Avenue and 23 townhouse condominiums off North Street, for a total of 25 new dwelling units, with associated roadways, parking areas, driveways, sidewalks, utilities, landscaping and stormwater management system. There is approximately 2.2 acres of Bordering Vegetated Wetland. No alteration of any resource area is proposed, but a large portion of the project falls within the Buffer, Zone of the BVW. Five of the six buildings, each containing 2-6 units, fall within the 100-foot Buffer Zone. All buildings are outside the 35 foot wetland buffer. Roof run-off is infiltrated through the use of linear dry wells at the rear of units 1-2, 3-7, 8-13, and 22-25. Roof run-off from units 14-15, as well as some road run-off, is also treated in the infiltration trench behind units 14-15. All road run-off is pretreated before it enters a detention basin. Mechanisms to treat water quality include a rain garden/bio-retention basin, proprietary treatment chamber, and deep sump hooded catch basins. -_ ___T_here_ar_e_2_detention_basins_and_a_bio-retention_basin, each located within the 100-foot Buffer Zone. All grading, pipes and outfall structures are kept at least 12 feet from the BVW. Utilities will be installed to service the lots as follows: Sewer: All units are sewered by the City sewer system. Water: All units are serviced by the City water system. Electric, Telephone and Cable Systems: All units are served by underground services. Natural Gas: All units are served by underground gas service. No work is proposed that will enter or alter the 2.2 acre Bordering Vegetated Wetland resource areas. ~~~~ ~ ~ ~. _ _. Relationship to the Northampton Wetlands Protection Ordinance The North Street condominium project is a true infill project, providing an attractive residential option within easy walking distance of schools, jobs, retail establishments, restaurants and entertainment. Section 337-10(B) of the City Code states that "To encourage infill development, which is considered more sustainable under the principles of smart growth and generally has a smaller environmental footprint than development in outlying areas, in ...Urban Residential-B... Zoning Districts, the Conservation Commission hereby waives any of the § 337-10 performance standards that are over and above state law with the exception of the setback requirements in Table (1 ): Zoning District No-Encroachment Zone Urban 35 feet from wetlands; Residential-B 10 feet from wetlands may be allowed at the and Urban discretion of the Conservation Commission if Residential-C applicant provides extraordinary mitigation, replication, restoration or open space preservation measures The plans show all buildings at least 35 feet from the BVW. Grading, walls, yards, patios, and certain components of the stormwater management system are kept at least 12 feet from the BVW. To the best r/ of our knowledge, this is the first time a request has been made to reduce the No Encroachment Zone from 35 feet to 10 feet under this specific section of the new City Wetlands Ordinance. We are interested in discussing with the Conservation Commission what mitigation or open space preservation measures would be appropriate to permit the proposed reduction. Bordering Vegetated Wetland Delineation Method The boundaries of the Bordering Vegetated Wetlands on site were flagged by Chuck Dauchy using wetland vegetation and soil indicators, and were accepted by the Northampton Conservation Commission with a positive determination issued August 24, 2007. A copy of the Determination is attached to this Notice of Intent. Mitigation of Potential Impacts to Resource Areas Erosion controls will consist of entrenched silt fencing, located no closer than 10' to the wetland buffer as shown on the plan. This will be the limit of work line. Erosion controls will remain in place until construction is complete and exposed soils have been successfully stabilized by vegetation. Wetland markers, clearly visible at 18 inches above grade, have been installed and will remain in place during construction. Afterward, they will be hammered flush with the ground and left in place permanently. Additional Information USGS Location Map WPA Form 3 -Notice of Intent Notification Sent to Abutters Abutters List for Map 25C, Parcels 12 and 17 Summary stormwater Report Determination of Applicability, Issued August 24, 2007 "Site Plan" by the Berkshire Design Group, dated Full stormwater Report 2 ;-, .~ ~1 ~° , Massachusetts~~epartment of Environmental Protection Provided by Mass°EP: Bureau of Resource Protection -Wetlands s e F e Ma SoE il Number WPA Form 3 -Notice of Intent Document Transaction Number Massachusetts Wetlands Protection /pct M.G.L. c. 131, §40 Northampton City/Town Important: A• General Information When filling out forms on the computer, use 1. Project Location (Note: electronic filers will click on button to locate p roject site): only the tab key to move your Northern Avenue Northampton 01060 cursor - do not use the return a. Street Address b. City/Town c. Zip Code key. Latitude and Longitude: r~ d. Latitude 25C 12&17 e. Longitude f. Assessors MaplPlat Number g. Parcel /Lot Number ,8/~, 2. Applicant: a. First Name b. Last Name Note: Tofino Associates, Inc. and Northern Avenue Homes, Inc. Before c. Organization completing this 31 Campus Plaza Road form consult your local d. Street Address Conservation Hadley MA 01035 Commission e. City/Town f. State g. Zip Code regarding any municipal bylaw (413) 256-0321 (413) 256-0130 or ordinance. h. Phone Number i. Fax Number j. Email Address 3. Property owner (required if different from applicant): ^ Check if more than one owner a. First Name b. Last Name c. Organization d. Street Address e. City/Town f. State g. Zip Code h. Phone Number i. Fax Number j. Email address 4. Representative (if any): a. First Name b. Last Name c. Company d. Street Address e. City/Town f. State g. Zip Code h. Phone Number i. Fax Number j: Email address 5. Total WPA Fee Paid (from NOI Wetland Fee Transmittal Form): $5,250 $2,612.50 $2,637.50 + $100.00 local fee a. Total Fee Paid b. State Fee Paid c. City/Town Fee Paid wpaform3.doc • rev. 02/21/08 ~ Page 1 of 8 ' ~ ., r- , (~~~ l ~ Massachusetts~uepartment of Environmental Protection P~o~iaea byMassoEP: Bureau of Resource Protection -Wetlands MaSSoEP Fiie Number WPA Form 3 -Notice of Intent Document Transaction Number Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Northampton City/Town A. General Information (continued) 6. General Project Description: The proposed project consists of a duplex on Northern Avenue and 23 townhouse condominiums off North Street, for a total of 25 new dwelling units, with associated stormwater management, site, utility and road work. A portion of the project falls within the Buffer Zone of BVW. No alteration of any resource area is proposed. 7a. Project Type Checklist: 1. ^ Single Family Home 3. ^ Limited Project Driveway Crossing 5. ^ Dock/Pier 7. ^ Coastal Engineering Structure 9: ^ Transportation 2. ® Residential Subdivision 4. ^ Commercial/Industrial 6. ^ Utilities 8. ^ Agriculture (e.g., cranberries, forestry) 10. ^ Other 7b. Is any portion of the proposed activity eligible to be treated as a limited project subject to 310 CMR 10.24 (coastal) or 310 CMR 10.53 (inland)? 1. ^ Yes ® No If yes, describe which limited project applies to this project: 2. Limited Project 8. Property recorded at the Registry of Deeds for: Hampshire a. County b. Certificate # (if registered land) Book 8428, Page 219 Book 8829, Page 341 c. Book and Page d. Book and Page B. Buffer Zone & Resource Area Impacts (temporalry & permanent) 1. ® Buffer Zone Only -Check if the project is located only in the Buffer Zone of a Bordering Vegetated Wetland, Inland Bank, or Coastal Resource Area. 2. ^ Inland Resource Areas (see 310 CMR 10.54-10.58; if not applicable, go to Section 6.3, Coastal Resource Areas). Check all that apply below. Attach narrative and any supporting documentation describing how the project will meet all performance standards for each of the resource areas altered, including standards requiring consideration of alternative project design or location. For all projects affecting other Resource Area Resource Areas, please attach a a. ^ Bank narrative explaining how b. ^ Bordering Vegetated the resource Wetland area was delineated. c. ^ Land Under Waterbodies and Waterways wpaform3.doc • rev. 02/21/08 Size of Proposed Alteration 1. linear feet 1. square feet 1. linear feet 3. cubic yards dredged Proposed Replacement (if any_j 2. linear feet 2. square feet 2. linear feet Page 2 of 8 .v ~'~ !~~ Massachusetts uepartment of Environmental Protection =° Provided by MassoEP: , Bureau of Resource Protection -Wetlands E N MassD P File umber WPA Form 3 -Notice of Intent Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 DocumentTrarisaction Number Northampton City/Town B. Buffer Zone & Resource Area Impacts (tempora ry & permanent) (cont'd) Resource Area Size of Proposed Alteration Proposed Replacement (if anyj d. ^ Bordering Land Subject to Flooding 1. square feet 2. square feet 3. cubic feet of flood storage lost 4. cubic feet replaced e. ^ Isolated Land Subject to Flooding 1. square feet 2. cubic feet of flood storage lost 3. cubic feet replaced f. ^ Riverfront Area 1. Name of Waterway (if available) 2. Width of Riverfront Area (check one): ^ 25 ft. -Designated Densely Developed Areas only ^ 100 ft. -New agricultural projects only ^ 200 ft. -All other projects s. Total area of Riverfront Area on the site of the proposed project: 4. Proposed alteration of the Riverfront Area: square feet a. total square feet b. square feet within 100 ft. c. square feet between 100 ft. and 200 ft. s. Has an alternatives analysis been done and is it attached to this NOI? ^ Yes ^ `No s. Was the lot where the activity is proposed created prior to August 1, 1996? ^ Yes ^ No Online Users: Include your document transaction number (provided on your receipt page) with all supplementary information you submit to the Department. 3. ^ Coastal Resource Areas: (See 310 CMR 10.25-10.35) Check all that apply below. Attach narrative and supporting documentation describing how the project will meet all performance standards for each of the resource areas altered, including standards requiring consideration of alternative project design or location. Resource Area Size of Proposed Alteration Proposed Replacement (if anvj a. ^ Designated Port Areas Indicate size under Land Under the Ocean, below b. ^ Land Under the Ocean 1. square feet c. ^ Barrier Beach d. ^ Coastal Beaches e. ^ Coastal Dunes wpaform3.doc • rev. 02/21/08 2. cubic yards dredged Indicate size under Coastal Beaches and/or Coastal Dunes below 1, square feet 2. cubic yards beach nourishment 1. square feet 2. cubic yards dune nourishment Page 3 of 8 !i ~ 4 ~ i Massachusetts'uepartment of Environmental Protection ergvided by MassoEe: Bureau of Resource Protection -Wetlands Mass~EP Fiie Number WPA Form 3 -Notice of Intent Document Transaction Number Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Northampton City/Town B. Buffer Zone & Resource Area Impacts (temporary & permanent) (cont'd) Size of Proposed Alteration Proposed Replacement (if any f. ^ Coastal Banks 1. linear feet g. ^ Rocky Intertidal Shores 1. square feet h. ^ Salt Marshes 1. square feet 2. sq ft restoration, rehab., creation i. ^ Land Under Salt Ponds 1. square feet 2. cubic yards dredged j. ^ Land Containing Shellfish 1. square feet k. ^ Fish Runs Indicate size under Coastal Banks, inland Bank, Land Under the Ocean, and/or inland Land Under Waterbodies and Waterways, above 1. cubic yards dredged I. ^ Land Subject to Coastal Storm Flowage 1. square feet 4. ^ Restoration/Enhancement If the project is for the purpose of restoring or enhancing a wetland resource area in addition to the square footage that has been entered in Section B.2.b or B.3.h above, please enter the additional amount here. a. square feet of BVW b. square feet of Salt Marsh C. Other Applicable Standards and Requirements Streamlined Massachusetts Endangered Species Act/Wetlands Protection Act Review 1. Is any portion of the proposed project located in Estimated Habitat of Rare Wildlife as indicated on the most recent Estimated Habitat Map of State-Listed Rare Wetland Wildlife published by the Natural Heritage and Endangered Species Program (NHESP)? To view habitat maps, see the Massachusetts Natural Heritage Atlas or go to http://www.mass.aov/dfwele/dfw/nhesp/nhregmap.htm. a. ^ Yes ® No If yes, include proof of mailing or hand delivery of NOI to: Natural Heritage and Endangered Species Program Division of Fisheries and Wildlife 2008 (MassGIS) Route 135, North Drive b. Date of map Westborough, MA 01581 If yes, the project is also subject to Massachusetts Endangered Species Act (MESA) review (321 CMR 10.18). To qualify for a streamlined, 30-day, MESA/Wetlands Protection Act review, please complete Section C.1.C, and include requested materials with this Notice of Intent (NOI); OR complete Section C.1 .d, if applicable. If MESA supplemental information is not included with the NOI, by completing Section 7 of this form, the NHESP will require a separate MESA filing which may take up to 90 days to review (unless noted exceptions in Section 2 apply, see below). wpaform3.doc • rev. 02/21/08 Page 4 of 8 ~~ ,° Massachusetts uepartment of Environmental Protection Provided by MassDEP: Bureau of Resource Protection -Wetlands Mass~EF Fiie Number WPA Form 3 -Notice of Intent Document Transaction Number Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Northampton City/Town C. Other Applicable Standards and Requirements (cont'd) 1. c. Submit Supplemental Information for Endangered Species Review 1. ^ Percentage/acreage of property to be altered: (a) within wetland Resource Area percentage/acreage (b) outside Resource Area percentage/acreage 2. ^ Assessor's Map or right-of-way plan of site a. ^ Project plans for entire project site, including wetland resource areas and areas outside of wetlands jurisdiction, showing existing and proposed conditions, existing and proposed tree/vegetation clearing line, and clearly demarcated limits of work ** (a) ^ Project description (including description of impacts outside of wetland resource area & buffer zone) (b) ^ Photographs representative of the site (c) ^ MESA filing fee (fee information available at: http://www.mass.gov/dfwele/dfw/nhesp/nhenvmesa.htm) Make check payable to "Natural Heritage & Endangered Species Fund" and mail to NHESP at above address Projects altering 70 or more acres of land, also submit: (d) ^ Vegetation cover type map of site (e) ^ Project plans showing Priority & Estimated Habitat boundaries d. OR Check One of the Following 1. ^ Project is exempt from MESA review. Attach applicant letter indicating which MESA exemption applies. (See 321 CMR 10.14, http://www.mass.gov/dfwele/dfw/nhesp/nhenvexemptions.htm; the NOI must still be sent to NHESP if the project is within estimated habitat pursuant to 310 CMR 10.37 and 10.59.) 2. ^ Separate MESA review ongoing. a. NHESP Tracking Number b. Date submitted to NHESP s. ^ Separate MESA review completed. Include copy of NHESP "no Take" determination or valid Conservation & Management Permit with approved plan. Some projects not in Estimated Habitat may be located in Priority Habitat, and require NHESP review (see www.nhesp.ora regulatory review tab). Priority Habitat includes habitat for state- listed plants and strictly upland species not protected by the Wetlands Protection Act. ** MESA projects may not be segmented (321 CMR 10.16). The applicant must disclose full development plans even if such plans are not required as part of the Notice of Intent process. wpaform3.doc • rev. 02/21/08 Page 5 of 8 ~ C- ~ ~~~ _.. Massachusetts ~epartmen# of Environmental Protection ,Provided by MassDEP Bureau of Resource Protection -Wetlands MaSSoEe Fi,e Number WPA Form 3 -Notice of Intent .Document Transaction Number Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Northampton City/Town C. Other Applicable Standards and Requirements (cont'd) 2. For coastal projects only, is any portion of the proposed project located below the mean high water line or in a fish run? a. ® Not applicable -project is in inland resource area only b. ^ Yes ^ No If yes, include proof of mailing or hand delivery of NOI to either: South Shore - Cohasset to Rhode North Shore -Hull to New Hampshire: Island, and the Cape & Islands: Division of Marine Fisheries - Division of Marine Fisheries - North Shore Office Southeast Marine Fisheries Station Attn: Environmental Reviewer Attn: Environmental Reviewer 30 Emerson Avenue 838 South Rodney French Blvd. Gloucester, MA 01930 New Bedford, MA 02744 Also if yes, the project may require a Chapter 91 license. For coastal towns in the Northeast Region, please contact MassDEP's Boston Office. For coastal towns in the Southeast Region, please contact MassDEP's Southeast Regional Office. 3. Is any portion of the proposed project within an Area of Critical Environmental Concern (ACEC)? online Users: a. ^ Yes ® No If yes, provide name of ACEC (see instructions to WPA Form 3 or MassDEP Include your Website for ACEC locations). Note: electronic filers click on Website. document transaction b. ACEC number (provided on 4. Is any portion of the proposed project within an area designated as an Outstanding Resource Water your receipt (ORW) as designated in the Massachusetts Surface Water Quality Standards, 314 CMR 4.00? page) with all supplementary a. ^ Yes ® No information you submit to the 5. Is any portion of the site subject to a Wetlands Restriction Order under the Inland Wetlands department. Restriction Act (M.G.L. c. 131, § 40A) or the Coastal Wetlands Restriction Act (M.G.L. c. 130, § 105)? a. ^ Yes ® No 6. Is this project subject to provisions of the MassDEP Stormwater Management Standards? a. ® Yes. Attach a copy of the Stormwater Report as required by the Stormwater Management Standards per 310 CMR 10.05(6)(k)-(q) and check if: 1. ^ Applying for Low Impact Development (LID) site design credits (as described in Stormwater Management Handbook Vol. 2, Chapter 3) 2. ^ A portion of the site constitutes redevelopment s. ^ Proprietary BMPs are included in the Stormwater Management System. b. ^ No. Check why the project is exempt: 1. ^ Single-family house 2. ^ Emergency road repair 3. ^ Small Residential Subdivision (less than or equal to 4single-family houses or less than or equal to 4 units in multi-family housing project) with no discharge to Critical Areas. wpaform3.doc • rev. 02/21/08 Page 6 of 8 ~~; ~-~ Massachusetts'~epartment of Environmental Protection Bureau of Resource Protection -Wetlands WPA Form 3 -Notice of Intent Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Provided by MassDEP: MassDEP File Number Document Transaction Number Northampton City/Town D. Additional Information Applicants must include the following with this Notice of Intent (NOI). See instructions for details. Online Users: Attach the document transaction number (provided on your receipt page) for any of the following information you submit to the Department. 1. ® USGS or other map of the area (along with a narrative description, if necessary) containing sufficient information for the Conservation Commission and the Department to locate the site. (Electronic filers may omit this item.) 2. ® Plans identifying the location of proposed activities (including activities proposed to serve as a Bordering Vegetated Wetland [BVW] replication area or other mitigating measure) relative to the boundaries of each affected resource area. a. ® Identify the method for BVW and other resource area boundary delineations (MassDEP BVW Field Data Form(s), Determination of Applicability, Order of Resource Area Delineation, etc.), and attach documentation of the methodology. a. ® List the titles and dates for all plans and other materials submitted with this NOI. Notice of Intent Plans for North Street Condominiums, sheets L1-5, EC a. Plan Title The Berkshire Design Group Mark Darnold b. Prepared By c. Signed and Stamped by November 11, 2008 varies d. Final Revision Date e. Scale f. Additional Plan or Document Title g. Date s. ^ If there is more than one property owner, please attach a list of these property owners not listed on this form. s. ^ Attach proof of mailing for Natural Heritage and Endangered Species Program, if needed. 7. ^ Attach proof of mailing for Massachusetts Division of Marine Fisheries, if needed. s. ® Attach NOI Wetland Fee Transmittal Form s. ® Attach Stormwater Report, if needed. E. Fees 1. ^ Fee Exempt: No filing fee shall be assessed for projects of any city, town, county, or district of the Commonwealth, federally recognized Indian tribe housing authority, municipal housing authority, or the Massachusetts Bay Transportation Authority. Applicants must submit the following information (in addition to pages 1 and 2 of the NOI Wetland Fee Transmittal Form) to confirm fee payment: 5083 11-10-2008 2. Municipal Check Number 5077 4. State Check Number Northern Avenue Homes, Inc. 6. Payor name on check: First Name wpaform3.doc • rev. 02/21/08 Page 7 of 8 3. Check date 11-10-2008 5. Check date 7. Payor name on check: Last Name ry ~~.,... I/-~.. l Massachusetts,oepartment of Environmental Protection Provided by MassDEP: BUreaU Of ReSOUrCe PrOteCtlOn -Wetlands MassDEP File Number WPA Form 3 -Notice of Intent Document Transaction Number Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Northampton City/Town F. Signatures and Submittal Requirements hereby certify under the penalties of perjury that the foregoing Notice of Intent and accompanying plans, documents, and supporting data are true and complete to the best of my knowledge. I understand that the Conservation Commission will place notification of this Notice in a local newspaper at the expense of the applicant in accordance with the wetlands regulations, 310 CMR 10.05(5)(a). I further certify under penalties of perjury that all abutters were notified of this application, pursuant to the requirements of M.G.L. c. 131, § 40. Notice must be made by Certificate of Mailing or in writing by hand delivery or certified mail (return receipt requested) to all abutters within 100 feet of the property line of the project location. C 11-13-2008 1. Signatu f Applicant 2. Date 3. Signature of Property Owner (if different) 4. Date 5. Signature of Representative (if any) 6. Date For Conservation Commission: Two copies of the completed Notice of Intent (Form 3), including supporting plans and documents, two copies of the NOI Wetland Fee Transmittal Form, and the city/town fee payment, to the Conservation Commission by certified mail or hand delivery. For MassDEP: One copy of the completed Notice of Intent (Form 3), including supporting plans and documents, one copy of the NOI Wetland Fee Transmittal Form, and a copy of the state fee payment to the MassDEP Regional Office (see Instructions) by certified mail or hand delivery. Other: If the applicant has checked the "yes" box in any part of Section C, Item 3, above, refer to that section and the Instructions for additional submittal requirements. The original and copies must be sent simultaneously. Failure by the applicant to send copies in a timely manner may result in dismissal of the Notice of Intent. wpaform3.doc • rev. 02/21/08 Page 8 of 8 b G Massachusetts~~'~artment of Environmental Protnon Bureau of Resource Protection -Wetlands Program Checklist for Stormwater Report A. Introduction Important: A Stormwater Report must be submitted with the Notice of Intent permit application to document When filling out compliance with the Stormwater Management Standards. The following checklist is NOT a substitute for forms on the the Stormwater Re ort which should rovide.more substantive and detailed information but is offered . computer, use p ( p ) only the tab key here as a tool to help the applicant organize their Stormwater Management documentation for their to move your Report and for the reviewer to assess this information in a consistent format. As noted in the Checklist, cursor-do not the Stormwater Report must contain the engineering computations and supporting information set forth in use the return Volume 3 of the Massachusetts Stormwater Handbook. The Stormwater Re ort must be re ared and key. p p P certified by a Registered Professional Engineer (RPE) licensed in the Commonwealth. r~5 The Stormwater Report must include: • The Stormwater Checklist completed and stamped by a Registered Professional Engineer (see ~ page 2) that certifies that the Stormwater Report contains all required submittals. This Checklist is to be used as the cover for the completed Stormwater Report. • Applicant/Project Name • Project Address • Name of Firm and Registered Professional Engineer that prepared the Report • Long-Term Pollution Prevention Plan required by Standards 4-6 • Construction Period Pollution Prevention and Erosion and Sedimentation Control Plan required by Standard 8Z • Operation and Maintenance Plan required by Standard 9 In addition to all plans and supporting information, the Stormwater Report must include a brief narrative describing stormwater management practices, including environmentally sensitive site design and LID techniques, along with a diagram depicting runoff through the proposed BMP treatment train. Plans are required to show existing and proposed conditions, identify all wetland resource areas, NRCS soil types, critical areas, Land Uses with Higher Potential Pollutant Loads (LUHPPL), and any areas on the site where infiltration rate is greater than 2.4 inches per hour. The Plans shall identify the drainage areas for both existing and proposed conditions at a scale that enables verification of supporting calculations. As noted in the Checklist, the Stormwater Management Report shall document compliance with each of the Stormwater Management Standards as provided in the Massachusetts Stormwater Hahdbook. The soils evaluation and calculations shall be done using the methodologies set forth in Volume 3 of the Massachusetts Stormwater Handbook. To ensure that the Stormwater Report is complete, applicants are required to fill in the Stormwater Report Checklist by checking the box to indicate that the specified information has been included in the Stormwater Report. If any of the information specified in the checklist has not been submitted, the applicant must provide an explanation. The completed Stormwater Report Checklist and. Certification must be submitted with the Stormwater Report. ' The Stormwater Report may also include the Illicit Discharge Compliance Statement required by Standard 10. If not included in the Stormwater Report, the Illicit Discharge Compliance Statement must be submitted prior to the discharge of stormwater runoff to the post-construction best management practices. z For some complex projects, it may not be possible to include the Construction Period Erosion and Sedimentation Cdntrol Plan in the Stormwater Report. In that event, the issuing authority has the discretion to issue an Order of Conditions that approves the project and includes a condition requiring the proponent to submit the Construction Period Erosion and Sedimentation Control Plan before commencing any land disturbance activity on the site. Kohl NA swchecklist.doc • 04/01/08 ~ Stormwater Report Checklist • Page 1 of 8 c ,~ . ~--' Bureau of Res~;;e Protection - Wetlart~~:~Prc~gram ~ ,~ <: ~ ~ ~~ Ch~~k~i~t fc~r ~to~rx~~nrat~r ~e~a~~t B. Stormwater Checklist and ~Certiffcation The following checklist is intended to serve as a guide for applicants as to the elements that ordinarily need to be addressed in a complete Stormwater Report. The checklist is also intended to provide conservation commissions and other reviewing authorities with a summary of the components necessary for a comprehensive Stormwater Report that addresses the ten Stormwater Standards- Note: Because stormwater requirements vary from project to project, it is possible that a complete Stormwater Repor# may not include information on some of the subjects specified in the Checklist. If it is determined that a specific item does not apply to the project under review, please note that the item is not applicable (N.A.) and provide the reasons for that determination. A complete checklist must. include the Certification setforth below signed by the Registered Professional Engirieerwho prepared the Stormwater Report. Registered Professional Engineer's Certification I have r:.eviewed the Stormwater Report, including thesoil evaluation, computations, Long-term Pollution Prevention Plan, the Gonstruetion Period Erosion and Sedimentation Control Plan {if included), the Long- term Post-Consftvction Operation and Maintenance Klan, the Illicit Discharge Compliance Statement (if included) and the piahs showing the storrnwater management system, and have determined that they have been pre.pa~ed in accordance with the requirements of the Stormv/ater Management Standards as further elaborated by the IVlassachusetts Stormwater Handbook. I have also determined that the information presented in the Sforrnwater Ctlecklist is accurate and that the information presented in the Stormwater Re ort accurate! . refl is nditio sat site as f the date of t~iis ermit a lication p ~-- ~~ ~e. fD~s~ o~ ~l`~~ ~~o~~.ec~~2. PP Registered Professional Engineer Block and Sigr)ature ~~~~H ol:'1d~~9c~ o~ MARK G~, 8. rn.. o DARhOtD ~. ,~ CIYIL ltito. 32459 Sig,. atuie and Date ~.._._.. ~heck'lisf P'co.Je~f~Type::ls.th.e application for new development, redevelopment; or a. mix of new and redeveicprnent? ~ New development ^ Redevelopment ^ Mix. of New Development and Redevelopment 1. Koh( NA swchecklist • 04/01!08 Stormwater Report Checklist • Page 2 of 8 >~ . Massachusetts ~'~artment of Environmental Prot melon ` Bureau of Resource Protection -Wetlands Program \ Checklist for Stormwater Report Checklist (continued) LID Measures: Stormwater Standards require LID measures to be considered. Document what environmentally sensitive design and LID Techniques were considered during the planning and design of the project: ® No disturbance to any Wetland Resource Areas ^ Site Design Practices (e.g. clustered development, reduced frontage setbacks) ^ Reduced Impervious Area (Redevelopment Only) ® Minimizing disturbance to existing trees and shrubs ^ LID Site Design Credit Requested: ^ Credit 1 ^ Credit 2 ^ Credit 3 ® Use of "country drainage" versus curb and gutter conveyance and pipe ® Bioretention Cells (includes Rain Gardens) ^ Constructed Stormwater Wetlands (includes Gravel Wetlands designs) ^ Treebox Filter ® Water Quality Swale ® Grass Channel ^ Green Roof ^ Other (describe): Standard 1: No New Untreated Discharges ® No new untreated discharges ® Outlets have been designed so there is no erosion or scour to wetlands and waters of the Commonwealth ® Supporting calculations specified in Volume 3 of the Massachusetts Stormwater Handbook included. Kohl NA swchecklist.doc • 04/01/08 Stormwater Report Checklist • Page 3 of 8 ., ~- MassaGhusetts~ ~;partment of Environmental .Proti ~on '" Bureau of Resource Protection -Wetlands Program Checklist for stormwater Report Checklist (continued) Standard 2: Peak Rate Attenuation ^ Standard 2 waiver requested because the project is located in land subject to coastal storm flowage and stormwater discharge is to a wetland subject to coastal flooding. ^ Evaluation provided to determine whether off-site flooding increases during the 100-year 24-hour storm. ® Calculations provided to show that post-development peak discharge rates do not exceed pre- development rates for the 2-year and 10-year 24-hour storms. If evaluation shows that off-site flooding increases during the 100-year 24-hour storm, calculations are also provided to show that post-development peak discharge rates do not exceed pre-development rates for the 100-year 24- hourstorm. Standard 3: Recharge ® Soil Analysis provided. ® Required Recharge Volume calculation provided. ^ Required Recharge volume reduced through use of the LID site Design Credits. ® Sizing the infiltration, BMPs is based on the following method: Check the method used. ® Static ^ Simple Dynamic ^ Dynamic Field ^ Runoff from all impervious areas at the site discharging to the infiltration BMP. ^ Runoff from all impervious areas at the site is not discharging. to the infiltration BMP and calculations are provided showing that the drainage area contributing runoff to the infiltration BMPs is sufficient to generate the required recharge volume. ® Recharge BMPs have been sized to infiltrate the Required Recharge Volume for its respective drainage area. ~ Recharge BMPs have been sized to infiltrate the Required Recharge Volume only to the maximum extent practicable for the following reason: ® Site is comprised solely of C and D soils and/or bedrock at the land surface ^ M.G.L. c. 21 E sites pursuant to 310 CMR 40.0000 ^ Solid Waste Landfill pursuant to 310, CMR 19.000 ® Project is otherwise subject to stormwater Management Standards only to the maximum extent practicable. ® Calculations showing that the infiltration BMPs will drain in 72 hours are provided.. ^ Property includes a M.G.L. c. 21 E site or a solid waste landfill and a mounding analysis is included. 80% TSS removal is required prior to discharge to infiltration BMP if Dynamic Field method is used. Kohl NA swchecklist.doc • 04/01/08 stormwater Report Checklist • Page 4 of 8 °•: o Massachusetts(~;partment of Environmental Protl ~on Bureau of Resource Protection -Wetlands Program ' er Re ort Checklist for Stormwat p Checklist (continued) Standard 3: Recharge (continued) ^ The infiltration BMP is used to attenuate peak flows during storms greater than or equal to the 10- year 24-hour storm and separation to seasonal high groundwater is less than 4 feet and a mounding analysis is provided. ^ Documentation is provided showing that infiltration BMPs do not adversely impact nearby wetland resource areas. Standard 4: Water Quality The Long-Term Pollution Prevention Plan typically includes the following: • Good housekeeping practices; • Provisions for storing materials and waste products inside or under cover; • Vehicle washing controls; • Requirements for routine inspections and maintenance of stormwater BMPs; • Spill prevention and response plans; • Provisions for maintenance of lawns, gardens, and other landscaped areas; • Requirements for storage and use of fertilizers, herbicides, and pesticides; • Pet waste management provisions; • Provisions for operation and management of septic systems; • Provisions for solid waste management; • Snow disposal and plowing plans relative to Wetland Resource Areas; • Winter Road Salt and/or Sand Use and Storage restrictions; • Street sweeping schedules; • Provisions for prevention of illicit discharges to the stormwater management system; • Documentation that stormwater BMPs are designed to provide for shutdown and containment in the event of a spill or discharges to or near critical areas or from LUHPPL; • Training for staff or personnel involved with implementing Long-Term Pollution Prevention Plan; • List of Emergency contacts for implementing Long-Term Pollution Prevention Plan. ® A Long-Term Pollution Prevention Plan is attached to stormwater Report and is included as an attachment to the Wetlands Notice of Intent. ^ Treatment BMPs subject to the 4.4%TSS removal pretreatment requirement and the one inch rule for calculating the water quality volume are included, and discharge: ^ is within the Zone II or Interim Wellhead Protection Area ^ is near or to other critical areas ^ is within soils with a rapid infiltration rate (greater than 2.4 inches per hour) ^ involves runoff from land uses with higher potential- pollutant loads. ^ The Required Water Quality Volume is reduced through use of the LID site Design Credits. ® Calculations documenting that the treatment train meets the 80%TSS removal requirement and, if applicable, the 44%TSS removal pretreatment requirement, are provided. Kohi NA swchecklist.doc • 04/01/08 stormwater Report Checklist • Page 5 of 8 .: ~. Massachusetts~~Partment of Environmental Protl ion Bureau of Resource Protection -Wetlands Program Checklist for Stormwater Report Checklist (continued) Standard 4: Water Quality (continued) ® The BMP is sized (and calculations provided) based on: ® The'/2" or 1" Water Quality Volume or ^ The equivalent flow rate associated with the Water Quality Volume and documentation is provided showing that the BMP treats the required water quality volume. ® The applicant proposes to use proprietary BMPs, and documentation supporting use of proprietary BMP and proposed TSS removal rate is provided. This documentation may be in the form of the propriety BMP checklist found in Volume 2, Chapter 4 of the Massachusetts Stormwater Handbook and submitting copies of the TARP Report, STEP Report, and/or other third party studies verifying performance of the proprietary BMPs. ^ A TMDL exists that indicates a need to reduce pollutants other than TSS and documentation showing that the BMPs selected are consistent with the TMDL is provided. Standard 5: Land Uses With Higher Potential Pollutant Loads (LUHPPLs) IVot Applicable - Proposed project site is not expected to yield high potential pollutant loads. ^ The NPDES Multi-Sector General Permit covers the land use and the Stormwater Pollution Prevention Plan (SWPPP) has been included with the Stormwater Report. ^ The NPDES Multi-Sector General Permit covers the land use and the SWPPP will be submitted prior to the discharge of Stormwater to the post-construction Stormwater BMPs. ^ The NPDES Multi-Sector General Permit does not cover the land use. ^ LUHPPLs are located at the site and industry specific source control and pollution prevention measures have been proposed to reduce or eliminate the exposure of LUHPPLs to rain, snow, snow melt and runoff, and been included in the long term Pollution Prevention Plan. ^ All exposure has been eliminated. ^ All exposure has not been eliminated and all BMPs selected-are on MassDEP LUHPPL list. ^ The LUHPPL has the potential to generate runoff with moderate to higher concentrations of oil and grease (e.g. all parking lots with >1000 vehicle trips per day) and the treatment train includes an oil grit separator, a filtering bioretention area, a sand filter or equivalent. Standard 6: Critical Areas Not Applicable -The project site does not discharge to a critical area. ^ The discharge is near or to a critical area and the treatment train includes only BMPs that MassDEP has approved for stormwater discharges to or near that particular class of critical area. ^ Critical areas and BMPs are identified in the Stormwater Report. Kohf NA swchecklist.doc • 04/01/08 Stormwater Report Checklist • Page 6 of 8 IVlassachusetts~ ~partment of Environmental Prot ion Bureau of Resource Protection -Wetlands Program Checklist for Stormwater Report Checklist (continued) Standard 7: Redevelopments and Other Projects Subject to the Standards only to the maximum extent practicable ® The project is subject to the Stormwater Management Standards only to the maximum Extent Practicable as a:site with only "Hydrologic Group C" Soils ^ Limited Project ^ Small Residential Projects: 5-9 single family houses or 5-9 units in amulti-family development provided there is no discharge that may potentially affect a critical area. ^ Small Residential Projects: 2-4 single family houses or 2-4 units in amulti-family development with a discharge to a critical area ^ Marina and/or boatyard provided the hull painting, service and maintenance areas are protected from exposure to rain, snow, snow melt and runoff ^ Bike Path and/or Foot Path ^ Redevelopment Project ^ Redevelopment portion of mix of new and redevelopment. ® Certain standards are not fully met (Standard No. 1, 8, 9, and 10 must always be fully met) and an explanation of why these standards are not met is contained in the Stormwater Report. ^ The project involves redevelopment and a description of all measures that have been taken to improve existing conditions is provided in the Stormwater Report. The redevelopment checklist found in Volume 2 Chapter 3 of the Massachusetts Stormwater Handbook may be used to document that the proposed stormwater management system (a) complies with Standards 2, 3 and the pretreatment and structural BMP requirements of Standards 4-6 to the maximum extent practicable and (b) improves existing conditions. Standard 8: Construction Period Pollution Prevention and Erosion and Sedimentation Control . A Construction Period Pollution Prevention and Erosion and Sedimentation Control Plan must include. the following information: • Narrative; • Construction Period Operation and Maintenance Plan; • Names of Persons or Entity Responsible for Plan Compliance; • Construction Period Pollution Prevention Measures; • Erosion and Sedimentation Control Plan Drawings; • Detail drawings and specifications for erosion control BMPs, including sizing calculations; • Vegetation Planning; • Site Development Plan; • Construction Sequencing Plan; • Sequencing of Erosion and Sedimentation Controls; • Operation and Maintenance of Erosion and Sedimentation Controls; • Inspection Schedule; • Maintenance Schedule; • Inspection and Maintenance Log Form. ® AConstruction-Period Pollution Prevention and Erosion and Sedimentation. Control Plan containing. the information set forth above has been included iri the Stormwater Report. Kohl NA swchecklist.doc • 04/01/08 Stormwater Report Checklist • Page 7 of 8 °~ ~; Massachusettsiipartment of Environmental Prot ion ~ Bureau of Resource Protection -Wetlands Program Checklist for Stormwater Report Checklist (continued) Standard 8: Construction Period Pollution Prevention and Erosion and Sedimentation Control (continued) ^ The project is highly complex and information is included in the Stormwater Report that explains why it is not possible to submit the Construction Period Pollution Prevention and Erosion and Sedimentation Control Plan with the application. A Construction Period Pollution Prevention and Erosion and Sedimentation Control has not been included in the Stormwater Report but will be submitted before land disturbance begins. ^ The project is not covered by a NPDES Construction General Permit. ® The project is covered by a NPDES Construction General Permit and a copy of the DRAFT SWPPP is in the Stormwater Report. ^ The project is covered by a NPDES Construction General Permit but no SWPPP been submitted. The SWPPP will be submitted BEFORE land disturbance begins. Standard 9: Operation and Maintenance Plan ® The Post Construction Operation and Maintenance Plan is included in the Stormwater Report and includes the following information: ® Name of the stormwater management system owners; ® Party responsible for operation and maintenance; ® Schedule for implementation of routine and non-routine maintenance tasks; ^ Plan showing the location of all stormwater BMPs maintenance access areas; ^ Description and delineation of public safety features; ^ Estimated operation and maintenance budget; and ® Operation and Maintenance Log Form. ^ The responsible party is not the owner of the parcel where the BMP is located and the Stormwater Report includes the following submissions: ^ A copy of the legal instrument (deed, homeowner's association, utility trust or other legal ehtity) that establishes the terms of and legal responsibility for the operation and maintenance of the project site stormwater BMPs; ^ A plan and easement deed that allows site access for the legal entity to operate and maintain BMP functions. Standard 10: Prohibition of Illicit Discharges ^ The Long-Term Pollution Prevention Plan includes measures to prevent illicit discharges; An Illicit Discharge Compliance Statement is attached; ~ NO Illicit Discharge Compliance Statement is attached but will be submitted prior to the discharge of any stormwater to post-construction BMPs. Kohl NA swchecklist.doc • 04/01/08 Stormwater Report Checklist • Page 8 of 8 ;_ ~`. ~'J t> North Street Condominiums Northern Avenue & North Street Northampton, Massachusetts Impervious Surface Study Apri128, 2009 _-. _ . >~ ;. ~: sir,. ~' , ;~~ ~,{ ~. ;~,. :: ~ i. =', C .l. -rJ.n r;~r;: icy -_ _ 6' .~... e {~ +'w f s _ e j rw ~i ,m'.J i .~ ; __ J - Stormwater Drainage Report for Northern Avenue Housing Northampton, MA Prepared by: The Berkshire Design Group ,Inc . 4 Allen Place, Northampton, Massachusetts 01060 November 11, 2008 Prepared for: Tofino Associates, Inc. 31 Campus Plaza Road Hadley, MA 01035 t ~~J ~~ ~ ~ Northern Avenue ~~.~ ~-~~ November 11, 2008 Northampton, Massachusetts Stormwater Drainage Report Table of Contents Introduction Site Terrain and Soils Existing Conditions Proposed Conditions Calculations and Design Stormwater Standards Summary References Fi ures Figure 1 Pre- Development Drainage Area Map Figure 2 Post Development Drainage Area Map Figure 3 USDA Soils Map Appendices 2 2 3 3 5 6 9 9 Appendix A Pre- and Post Development Hydrologic Calculations Appendix B Soil Test Pit Information Appendix C TSS Removal Summary and Calculations Appendix D Standard 3 Recharge Calculations Appendix E Proposed Stormwater Management System Operation &Maintenance Plan Appendix F Long Term Pollution Prevention Plan Appendix G Stormwater Pollution Prevention and Erosion Control Plan The Berkshire Design Group, Inc. Page 1 . ~r, ~_-\ Northern Avenue ~. i ~_- Northampton, Massachusetts I. Introduction ~~\ --" November 11, 2008 II. Storrnwater Drainage Report The following report presents an analysis of the stormwater management system for the proposed development of 25 housing units located off of Northern Avenue in zoning district URB in Northampton, Massachusetts. The proposed development includes 25 new housing units and associated parking areas, driveways, and sidewalks, utilities, landscape features and storrnwater management system. The total site area is approximately 6 acres of which approximately 3.4 will be disturbed by construction activities. The impervious area on site will increase due to the new development and the stormwater management system has been designed to minimize proposed peak flows to reduce or match existing flows off the site. Mechanisms to reduce runoff and treat water quality include a rain garden, a proprietary treatment chamber, infiltration trench, dry wells, deep sump hooded catch basins, and 2 detention basins. Site Terrain and Soils The project site is comprised of gradual sloping terrain, which generally drains toward the wetlands on the west part of the site. The USDA Soil Survey of Hampshire County, Massachusetts, Central Part report classifies the site soils as (see attached soil map): • (Ra) Raynham Silt Loam Hydrologic Group: C Flood Risk: None Depth to Water Table: 0.5'-2.0' Depth to Bedrock: >60" • (Au) Amostown-Windsor Silty Substratum Hydrologic Group: C Flood Risk: None Depth to Water Table: 1.5'-3.0' Depth to Bedrock: >60" • (ITd) Udorthents Smooth Soil formed by cutting or filling developed area. Reference pedon not given. Assumed Hydrologic Group: C The Berkshire Design Group, Inc. Page 2 z> '~ ~ ~, Northern Avenue ~ , ~ - November 11, 2008 Northampton, Massachusetts Stormwater Drainage Report A series of test pits were conducted on site to determine subsurface conditions. The purpose of the test pits was to evaluate the site for the existence of ledge, the ability of the site to support stormwater drainage components, and for groundwater information. In general, the test pits confirmed the USDA Soil Survey findings for the site as ground water is generally very high throughout the site, thereby reducing the potential areas where infiltration would be feasible. The test pit logs are attached in Appendix B. III. Existing Conditions The existing site includes one drainage area: E-1. The existing drainage area boundary is depicted on the Pre-Development Drainage Area Plan (Figure 1). The overall curve number (CN) in existing conditions is, 74. The control point to determine peak flow in existing conditions is the stream located on the property line west of the site shown on Figure 1 as E-CP. The following is a brief description of the drainage area: E-1 E-1 is approximately 7.75 acres in size and contains existing houses, pavement, grass, wooded areas, and a large wetland area on the west part of the site. Runoff flows overland in a southwestern direction through the wetlands and to the stream located southwest of the site. IV. Proposed Conditions The stormwater management system in proposed conditions has been designed to treat and reduce runoff on site. The proposed site contains eight drainage areas: P-1, P-2, P-3, P-4, P-5, P-6, P-7 and P-8 (Figure 2) and the overall curve number (CN) in proposed conditions is 80. The control point to determine peak flow in proposed conditions is the stream located on the property line located west of the site shown on Figure 2 as P-CP. The following is a brief description of each drainage area: P-1 P-1 is approximately 4.99 acres in size and contains the northwestern area of the site consisting of all of the wetland area, grass and wooded areas, and new roof and pavement. The drainage follows a similar pattern as in existing conditions. It flows overland in a southwestern direction through the wetlands and to the stream located southwest of the site. The runoff from the back of the new roof areas located within P-1 are directed to dry wells where the water is infiltrated into the ground. These dry wells are designed to be very shallow (approximately one foot in depth) due to high groundwater throughout the site. The dry wells are designed o with an overflow outlet that allows roof water to sheet flow across the land toward the wetlands as it does in existing conditions. The new driveway and front roof The Berkshire Design Group, Inc. Page 3 Northern Avenue (, -~ November 11, 2008 Northampton, Massachusetts Stormwater Drainage Report areas of units 1 and 2 will flow in a similar pattern as the pavement and grass area does in existing conditions. P-2 P-2 is approximately 0.24 acres in size and is located in the eastern portion of the site. It contains a portion of the roof from unit 14 and 15 in which runoff flows through roof leaders into the infiltration trench which overflows into a catch basin within the area. This area also contains a small portion of new pavement, grass, and trees. Excluding the roof, all other runoff from this area is directed into a catch basin which flows into a water quality basin then to a detention basin (DB#2) located on the west part of the site. P-3 P-3 is approximately 0.65 acres in size and is located in the northeastern part of the site. It contains new pavement and roof areas, grass, and a detention basin. Runoff from this area is directed to a water quality Swale which flows into a water catch basin followed by a detention/infiltration basin (DB#1) that discharges approximately 100 ft to the south. P-4 P-4 is approximately 0.34 acres in size in the east part of the site. It contains a portion of the new roof and pavement area, and grass and wooded areas. Runoff flows into a catch basin which directs the water to the infiltration trench noted is area P-2. The runoff follows the same pattern as area P-2 once within the trench. P-5 P-5 is approximately 0.19 acres in size and is located toward the center of the developed portion of the site. It contains mostly new pavement and roof areas and a small portion is grass and wooded area. Runoff flows into a catch basin where it is directed to a water quality basin and detention basin (DB#2) which discharges approximately 40ft from the wetland, allowing adequate overland flow to occur. P-6 P-6 is approximately 0.54 acres in size and is located on the south portion of the site. It contains a portion of the roof areas from units 16-21, new pavement, and grassed areas. The runoff is directed to a grass swale which flows into a catch basin. The catch basin flows through a proprietary stormwater treatment chamber that discharges into a detention basin (DB#2). P-7 P-7 is approximately 0.27 acres in size and is located on the southwestern portion of the site. It contains approximately mostly new roof and paved areas and only a small portion of the area is grass. The runoff flows southwest to a proprietary treatment chamber which discharges into a detention basin (DB#2). The Berkshire Design Group, Inc. Page 4 o Northern Avenue ~\ .~,i November 11, 2008 Northampton, Massachusetts V. Stormwater Drainage Report P-8 P-8 is approximately 0.53 acres in size and is located on the southwestern portion of the site. It contains a portion of the roof areas from units 22-25, new paved area, grass, and a detention basin (DB#2) and water quality basin. The paved area flows through a pre treatment system consisting of a stone diaphragm and grassed area which discharges into the water quality basin (rain garden) which overflows into the detention basin. The remaining area of P-8 sheet flows into the detention basin. Calculations and Design Drainage calculations were performed on Hydrocad Stormwater Modeling System version 8.0 using Soil Conservation Service (SCS) TR-20 methodology. The SCS method is based on rainfall observations, which were used to develop the Intensity-Duration-Frequency relationship, or IDF curve. The mass curve is a dimensionless distribution of rainfall over time, which indicates the fraction of the rainfall event that occurs at a given time within a 24-hour precipitation event. This synthetic distribution develops peak rates for storms of varying duration and intensities. The SCS distribution provides a cumulative rainfall at any point in time and allows volume dependent routing runoff calculations to occur. These calculations are included in the appendices. The watershed boundaries for calculation purposes are divided according to the proposed site grading and the natural limits of the drainage areas. The curve numbers (CNs) and times of concentration for the existing and proposed subcatchment areas are based on the soil type and the existing and proposed cover conditions at the site. The soil hydrologic group assumed for the site is noted in Figure 3. Watershed subcatchment areas, runoff coefficients and watercourse slopes are based on survey information. Calculations were performed for the 2-, 10-, and 100-year frequency storms under existing and proposed conditions. The results of the calculations are presented in Table 1 on the following page. Appendix A presents the Hydrocad calculations. Flow Rates & Water Quantity In the post development conditions the runoff from the proposed site will be routed to 2 open detention basins located along west part of the developed site. The proposed detention basins will attenuate peak flows in the proposed conditions through the use of outlet control structures. Stormwater will be discharged to the wetland that receives runoff in existing conditions. Although there are 5 infiltration systems are proposed (1 detention/infiltration basin, 4 dry wells and 1 infiltration trench) these were not included in the hydrocad The Berkshire Design Group, Inc. Page 5 ~, ~~ Northern Avenue _ ~- November 11.2008 Northampton, Massachusetts Stormwater Drainage Report calculations in order to provide a more conservative runoff quantity. Table 1 on the following page presents the comparison of flow rates and water quantity at both existing and proposed control points. Table 1 Peak Flow and Volume Summary 2-Year Storm 10-Year Storm 100-Year Storm Condition & Point of 3.00" 4.50" 6.50" Analysis Peak Flow Volume Peak Flow Volume Peak Flow Volume Rate(cfs) (acre-ft) Rate(efs (acre-ft) Rate(cfs) (acre-ft Existin ~ - Controll'e. -1.6f, 0.~6; Ir1.9 1.?~? ?U.?~ ?.3?0 "~Proposcd - - ~ ~ '.Coutr•oll't. ~` -1.62 ~ l).; ~3 ~1(l.~i 1.~~7 ~ I RZO ~'` _ ?.6~J~ >~. ~~vames in parentheses refer to HydroCad model and calculations. VI. MADEP Stormwater Standards Compliance The following section details how the project will meet DEP Stormwater Management Policy's ten Stormwater management standards. Standard 1 -Untreated Stormwater The proposed Stormwater system is designed to treat the new point source discharge prior to flowing to the resource area. All new outlets are outfitted with flared ends and rip rap to prevent any erosion from occumng in the area. See Appendix C for TSS removal summary. Standard 2 -Post-Development Peak Dischar e Rates The Stormwater system is designed so that post-development peak discharge rates do not exceed pre-development peak discharge rates leaving the site. In order to reduce runoff rates in proposed conditions 2 detention basins with outlet control structures are proposed. Note that although 5 infiltration systems are proposed, no exhilaration was included in the runoff calculations in order to maintain a more conservative peak discharge rate. Refer to Table 1 Peak Flow and Volume Summary and Appendix A for HydroCAD calculations. Standard 3 - Recharge to Groundwater Recharge to groundwater is designed to infiltrate to the maximum extent practicable in proposed conditions. The entire site consists of hydrologic group "C" soils and there is very high groundwater throughout most of the site (see Appendix B for test pit logs) which caused limitations for infiltration on many areas of the site because the separation of 2 feet~from groundwater could not be The Berkshire Design Group, Inc. Page 6 ~\ ` ,l ~ I Northern Avenue _ November 11, 2008 Northampton, Massachusetts Stormwater Drainage Report met. Where possible, infiltration is proposed: half of the areas of the roof from units 1-15 and 22-25 and a portion of the pavement located toward the center of the development are directed to dry wells and an infiltration trench sized to accommodate these areas. The upper detention/infiltrationbasm (DB#1) has been designed also hold and infiltrate the required recharge volume for its respective drainage area (see Appendix D for recharge calculations). Due to restrictions of the site terrain and soil conditions, not all of the impervious area could be directed to an infiltration system therefore a115 of the infiltration systems proposed are designed to hold at least twice the required recharge volume and still drawdown within 72 hours in order to meet Standard 3 to the maximum extent practicable (see Appendix D for recharge calculations). Standard 4 -Water OualitX The proposed stormwater management system has been designed to remove the average annual Total Suspended Solids (TSS) load in excess of 80% for the proposed site conditions (see Appendix C for calculations). There are 4 separate treatment chains proposed: Treatment Train 1(total of 85%TSS removed) The first treatment chain contains the impervious areas within P-3. The runoff is directed into a water quality swale to a catch basin which discharges into detention/infiltrationbasm (DB#1) which has been designed to hold the required water quality volume for its respective area which achieves a total TSS removal rate of approximately 85%. Note that the water quality swale was not included in the calculations of total TSS removal in Appendix C to maintain a more conservative removal rate. Treatment Train 2(total of 93%TSS removed) The second treatment chain contains the impervious areas from P-2, P-4, and P-5. The runoff is directed into a catch basins followed by a water quality basin (rain garden) which achieves a total TSS removal rate of approximately 93%. The water quality basin has been designed to hold a larger volume of water (738cf) than the water quality volume required (713cf) for the impervious area directed to it. Treatment Train 3(total of 90%TSS removed) The second treatment chain contains the paved impervious areas from P-8. The runoff is through a pretreatment system consisting of a stone diaphragm and grassed area which discharges into a water quality basin (rain garden) which achieves a total TSS removal rate of approximately 90%. The water quality basin has been designed to hold a larger volume of water (738cf) than the water quality volume required (713cf) for the impervious area directed to it. ` The Berkshire Design Group, Inc. Page 7 e ~ ~~ ~~~ Northern Avenue t _,~ ` ' November 11.2008 Northampton, Massachusetts stormwater Drainage Report Treatment Train 4(total of 83%TSS removed) The third treatment chain contains the impervious areas from P-6 and P-7. The runoff is directed into catch basins and then to a proprietary treatment chamber (Stormceptor STC 900*) which achieves a total TSS removal rate of approximately 83%. *Note: The stormwater treatment chamber has been sized based on MASTEP test evaluations. The attached table in appendix C displays TSS removal rates for systems based on the impervious area directed to the system. See attached Stormceptor sizing chart for impervious areas directed to the stormwater treatment chamber. In addition to removal of TSS, a Long Term Pollution Prevention Plan has been created to maintain a clean site and ensure that all BMPs are functioning to their maximum potential. See Appendix F for Long Term Pollution Prevention Plan. Standard 5 -Higher Potential Pollutant Loads The proposed project is not expected to yield high potential pollutant loads. Standard 6 - Protection of Critical Areas The project site does not discharge to critical areas as defined in MA DEP stormwater Policy Handbook. Standard 7 -Redevelopment Pro; ects The redevelopment of previously developed site standard is not applicable for this project. Standard 8 - Erosion/Sediment Control Erosion and sediment controls have been incorporated into the project design to prevent erosion, control sediments, and stabilized exposed soils during construction and land disturbance. See Appendix G for Construction Period Pollution Prevention and Erosion Sedimentation Control. Standard 9 - Operation/Maintenance Plan An Operation and Maintenance Plan for the proposed project is included in Appendix E. It includes general controls for construction and long term maintenance of the stormwater management system. Standard 10 -Prohibition of Illicit Discharges No Illicit Discharge Compliance Statement is included with this report however one will be submitted prior to the discharge of any stormwater to post- construction BMPs. The Berkshire Design Group, Inc. Page 8 ~~ ~~ Northern Avenue ' '` November 11, 2008 Northampton, Massachusetts Stormwater Drainage Report VII. Summary The impervious area from existing to proposed conditions will increase by approximately 51,000 sf from the new roadway and housing units. The proposed stormwater management system is designed to maintain or reduce the peak flow rates in proposed conditions for the 2-, 10-, and 100-year storm frequencies. Special care has been taken to treat runoff with a series of best management practices to ensure water quality and annual TSS removal rates in excess of 80%. These methods include deep sump hooded catch basins, a bioretention basin, a detention/infiltrationbasfn, and a stormwater treatment chamber. VIII. References United States Deparhnent of Agriculture. 1998. Soil Survey of Hampshire County (Central Part), Massachusetts. The Berkshire Design Group, Inc. Page 9 `, r Q >o r o T /y~.~ H ~ O o z ~ o D ,y D = ~ y A K ..7 ,J.., •v A ~ ~ ~ , IIII . W A • •.rrw . > T Q ~cMw„~tiss e C •J' • < .'•. >~ ,n •' 76.,78 ~,Y•:.:.:~ nm .,, ` z _.. ... r.. U ~_% N D- .' ~fr! on c• ~m • .1, ~ Y~ p.~q f '/ ' ~~~N i :7.79. ~,v ~ ~ to •F ;~ ________~r'l; i. ; ~ :. _. t I19.19'~ •, /. .•r• 7•, .' . 1F.•, /S'NOR N tAtENUE CONOOMINIUTA j ~ ~~.• ` I F?. ..i :: .:. OOK'b0s7, PAGE 179 '/,. • '•.~• h l.: ~: ~ '' PLIN BOOK 187. PAGE 150 4~ , i:.;. l::;~' i ... $ • .ti. y 1 .~.~ o .: 1. • ,. .__. .. _m~ ~~'; : • . -4- .1... ;~ -,ri~~1 r ..-~, off.., '; .:ybr/ ~ ;' ,~~~ ~z: ... P/'' /r: .V. ~ D ' _ i - au I no A~ ~ ~ 1. fj. , F~,~, ~1-I.. ~ N ~ 1~::'A u' ~ ..... ' , I` I {1 ^yJ ~ / '..J ..,.. ~•' I~:~::~ '4.Y: 'b '~P ~ NO. K ~• ~~ -c f_-:;r M~; A eaoK,o, cE Joo ~ • ; ~. • aR .:..<:; _ ~~ ~. .... _ ... ~. ,°....... 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Design Pre-Development Drainage Area Map Group, Inc. 4AllenPlace Northampton, Massachusetts 01060 NORTHERN AVENUE HOUSING Date: Scale: (413) 582-7000 FAX (413) 582-7005 NORTHAMPTON MASSACHUSETTS 11111/08 1"=100' ' %% 5 SJ7,'71" qy • ' :/ 99.76' •s ~~ 78.90' r., -L ~ J'. i:a~ v~l 'al~ Nfi1 SS F tF€~ ,~ ' '- 1': :......~.;.. , ~ .f: :fit: '>'~~ s _ ~- _ 1 is ~ ~ f ~~;~ - 90.,7• ^ ~ ~ I :.:::H:: - . 08 ` N~w~• .. ----4 S 5J7777" w ~~I 111 ~f ~ . . ~. ^ 8 R ~~ N> K -„7'~' y ~1~1~~'~~~~~ Y~~~"~~~~. 1i ^I '~IIAt"1~11~, via "n§E: l ::;.'~~.,:~: ~. k y~=$ 9<~' ~I 9 sag C>tE^ i 9 m 'q Icm. ~I gY*~g8a% ug ~7'~1 a'~., .A^ R1 is „s_g4y r ~. ! 'no. ., •. , ~ i ! ' i. ~' r.. y o ~ ~: ,.Y/ •.1. 1 ..:......::, s ., ;.JO. ~; .., t ~ ~ . I 1 , :_._ > 'c° m' R Q~9 *o in m~ u . 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':j ~ .%~:.. •M~• L.j •. ~ MFk °Gpf 19Y, VAGa_ 150 5;11 b• -. a rt:. ~~ I r ' .. . . --~ , .. -~i;, `t ~<~;_ ~ ~' - '~ ~ ~ 1111111 ' ~~ St Y ; , I ~' ' , ~ I ,:,': •.: ., m ~ i :: ~ ;q ,. ,,. _ r. ......... -;: ~ ~.2 !_ rE:` • I ti w b s -~~x - ~.~~_n ~ ~ a ,x €= O1 " ~~ - ~5~ x ~~ ~ ~ s• 1111~l~~1 1111 . : 11111 ~~~'~ > ~v~~ ,. ~ -~ g Y io_ i ~'4°j' $ i • t The Berkshire Design Group, Inc. 4 Allen Place Northampton, Massachusetts 01060 (413) 582-7000 • FAX (413) 582-7005 . r - ~ ~ ~~• - l ~N~ ~ ~ Zo ' , _ I ~ ~ u 1- rte ^_^O ~ ~ ~?~Q ~ ~' ~ ~ ~ ° w > i c o ~ t ~ 4 ~ J :: I~^C o, Qi ~a - ~ ~ m ~ , . ~~ - - - ~ ~ ~ I*I . ~ ~ .c, ri ~, ~ ' , ~~' . ~ ~~ - . - .~ ~ N ,:. _~~ r ~ ~ : rn ~~w ; ; t ' r .. - N- ---:~.. ill/~ 1-1A ~~ I ,~ ~2 ~~~~im ors .~ r ..:.: ~ ~Ia. .I.. iii~pnup G n3~t ~; . ~ : ~ ~ ~ ~ r= a ., t { ~ ; .I..... o.y <;~ m~° , ~,~ I,, ~ _ `~ ~,: `` r ~~n i I .I ~~M~ I~ ~ f : l ~~~,. I~~. <<L9; ~ it I + I YR+yu • k~ o i C ,. r i 1. , . _ -.~ -__ -._. KJ4.. _. .... - _... .... . ... _.-_.-.-.--_.__ _- _ NO!?TJ-I THE€7' 5 - .............. ................................ _........~......... ~ w __.-............_. 56 W'iE ._: .F do hog I~ __/,~j ,. L ;~ 3 Figure Title: Berkshire Reference: Figure Number: Design USDA SOUS Map Group Inc. , 4 Allen Place Northampton, Massachusetts 01060 NORTHERN AVENUE HOUSING D t S l (413) 582-7000 • FAX (413) 582-7005 NORTHAMPTON MASSACHUSETTS a e: 11/11/08 ca e: 1"=300' ~--~ ~~~ Massachusetts J ~ ~ epartment of Environmental Protection Bureau of Resource Protection -Wetlands. WPA, Form 2 - Determination. of Applicability Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Important: When filling out forms.on the computer, use only the tab key to move your cursor - do not use the return key. ran rahen A. General Information From: Northampton Conservation Commission To: Applicant Northern Avenue Homes, Inc and Tofino Associates 31 Campus Plaza Road Mailing Address Hadley MA 01035 City/Town State Zip Code Property Owner (if different from applicant): Douglas Kohl Name 31 Campus Plaza Road Mailing Address Hadley MA 01035 City/Town State Zip Code 1: Title and Date. (or Revised Date if applicable) of Final Plans and Other Documents: "Topographic" Plan of Land in Northampton, Massachusetts prepared fon August 20, 2007 Northern Avenue Homes, Inc. ~ Date -~ Title Title 2. Date Request Filed: June 20, 2007 B. Determination Date Date Pursuant to the authority of M.G.L. c. 131`, § 40, the Conservation Commission considered your Request for Determination of Applicability, with its supporting documentation, and made the following Determination. Project Description (if applicable): Resource Area Delineation Project Location: Northern Avenue Street Address 25C Assessors Map/Plat Number wpaform2.doc • Determination of Applicability •'rev. 1016/04 Northampton City/Town 12 & 17 Parcel/Lot Number Page 1 of 5 .c ,,~ I~ ~~ Massachusetts Department of Environmental Protection Bureau of Resource Protection -Wetlands ~' WPA Form 2 -Determination of Applicability Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 B. Determination (cont.) The following Determination(s) is/are applicable to the proposed site and/or project relative to the Wetlands Protection Act and regulations: Positive Determination Note: No work within the jurisdiction of the Wetlands Protection Act may proceed until a final Order of Conditions (issued following submittal of a Notice of Intent or Abbreviated Notice of Intent) or Order of Resource Area Delineation (issued following submittal of Simplified Review ANRAD) has been received from the issuing authority (i.e., Conservation Commission or the Department of Environmental Protection). ^ 1. The area described on the referenced plan(s) is an area subject to protection under the Act. Removing, filling, dredging, or altering of the area requires the filing of a Notice of Intent. ® 2a. The boundary delineations of the following resource areas described on the referenced plan(s) are confirmed as accurate. Therefore, the resource area boundaries confirmed in this Determination are binding as to all decisions rendered pursuant to the Wetlands Protection Act and its regulations regarding such boundaries for as long as this Determination is valid. The intermitteaccurate. Vernal pools have beennidentif d within the afeea sh wpl as wetla.ndseand conflrmed as have not been delineated. ^ 2b. The boundaries of resource areas listed below are not confirmed by this Determination, regardless of whether such boundaries are contained on the plans attached to this Determination or to the Request for Determination. ^ 3. The work described on referenced plan(s) and document(s) is within an area subject to protection under the Act and will remove, fill, dredge, or alter that area. Therefore, said work requires the filing of a Notice of Intent. . ^ 4. The work described on referenced plan(s) acid document(s) is within the Buffer Zone and will alter an Area subject to protection under the Act. Therefore, said work requires the filing of a Notice of Intent or ANRAD Simplified Review (if work is limited to the Buffer Zone). ® 5. The area and/or work described on referenced plan(s) and document(s) is subject to review and approval~by: Cit of Northam ton Name of Municipality Pursuant to the following municipal wetland ordinance or bylaw: Chapter 33.7 of the Code of Northam ton Wetlands Ordinance Ordinances Name rev. 10/6104 Page 2 of 5 Q /~1 /~\\ 1 I ~t Massachusetts Department of Environmental Protection Bureau of Resource Protection -Wetlands ` ~WPA Form 2 -Determination of Applicability Massachusetts Wetlands Protection Act M.G.L. c. 131, X40 t~. uetermination (cont.`) ^ 6. The following area and/or work, if any, is subject to a municipal ordinance or bylaw but not subject to the Massachusetts Wetlands Protection Act: ^ 7. If a Notice of Intent is filed for the work in the Riverfront Area described on referenced plan(s) and document(s), which includes all or part of the work described in the Request, the applicant must consider the following alternatives. (Refer to the wetland regulations at 10.58(4)c. for more information about the scope of alternatives requirements): ^ Alternatives limited to the lot on which the project is located. ^ ~ Alternatives limited to the lot on which the project is located, the subdivided lots, and any adjacent lots formerly or presently owned by the same owner. ~ ^ Alternatives limited to the original parcel on which the project is located, the subdivided parcels, any adjacent parcels, and any other land which can reasonably be obtained within the municipality. . ^ Alternatives. extend to any sites which can reasonably be obtained within the appropriate region.of the~state. - Negative Determination Note: No further action under the Wetlands Protection Act is required by the applicant. However, if the Department is requested to issue a Superseding Determination of Applicability, work may not proceed on this project unless~the Department fails to act on such request within 35 days of the date the .,,1 request is post-marked for certified mail or hand delivered to the Department. Work may then proceed at the owner's risk only upon notice to the Department and to the Conservation Commission. Requirements for requests for Superseding Determinations are listed at the end of this document. ^ 1. The area described in the Request is not an area subject to protection under the Act or the Buffer Zone. ^ 2. The work described in the Request is within an area subject to protection under the Act, but-will not remove, fill, dredge, or alter that area. Therefore, said work does not require the filing of a Notice of Intent. ^ 3. The work described in the Request is within the Buffer Zone, as defined in the regulations, but will not alter an Area subject to protection under the Act. Therefore, said work does not require the filing of a Notice of Intent, subject to the following conditions (if any). ^ 4. The work described in the Request is not within an Area subject to protection under the Act (including the Buffer Zone). Therefore, said work does not require the filing of a Notice of Interit, unless and until said work alters an Area subject to protection under the Act. wpaform2.doc • Determination of Applicability • rev. 10/6/04 Page 3 of 5 '4 ~.. ~ ~i ~~~ Massachusetts~u~.partment of Environmental Protection Bureau of Resource Protection -Wetlands WPA Form 2 -Determination of Applicability Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 ts. uetermination (cont.) ^ 5. The area described in the Request is subject to protection under the Act. Since the work described therein meets the requirements for the following exemption, as specified in the Act and the regulations, no Notice of Intent is required: Exempt Activity (site applicable statuatory/regulatory provisions) ^ 6. The area and/or work described in the Request is not subject to review and approval by: Name of Municipality Pursuant to a municipal wetlands ordinance or bylaw. i Name ~ Ordinance or Bylaw Citation C. Authorization This Determination is issued to the applicant and delivered as follows: ~ by hand delivery on ~~1~ a~ 2aa7 Date ^ by certified mail, return receipt requested on Date This Determination is valid for three years from the date of issuance (except Determinations for Vegetation Management Plans which are valid for the duration of the Plan). This Determination does not relieve the applicant from complying with all~~other applicable federal, state, or local statutes, ordinances, bylaws, or regulations. This Determination must be signed by a majority of the Conservation Commission. A copy must be sent to the appropriate DEP Regional Office (see http://www.mass.aov/dea/about/region findvour htm) and the property owner (if different from the applicant). ~~~ a3 , aao7 Date wpaform2.doc • Determination of Applicability • rev. 10/6/04 Page 4 of 5 ~~ ~~ ~ ~~~ Massachusetts Department of Environmental Protection Bureau of Resource Protection -Wetlands Program Checklist for Stormwater Report A. Introduction Important: When A Stormwater Report must be submitted with the Notice of Intent permit application to document filling out forms compliance with the Stormwater Management Standards. The following checklist is NOT a substitute for on the computer, the Stormwater Re ort which should rovide more substantive and detailed information but is offered use only the tab P ( p ) key to move your here as a tool to help the applicant organize their Stormwater Management documentation for their cursor - do not Report and for the reviewer to assess this information in a consistent format. As .noted in the Checklist, use the return the Stormwater Report must contain the engineering computations and supporting information set forth in key' Volume 3 of the Massachusetts Stormwater Handbook. The Stormwater Report must be prepared and ,~,~~ certified by a Registered Professional Engineer (RPE) licensed in the Commonwealth. ~~-~I The Stormwater Report must include: • The Stormwater Checklist completed and stamped by a Registered Professional Engineer (see page 2) that certifies that the Stormwater Report contains all required submittals.' This Checklist is to be used as the cover for the completed Stormwater Report. • Applicant/Project Name • Project Address • Name of Firm and Registered Professional Engineer that prepared the Report • Long-Term Pollution Prevention Plan required by Standards 4-6 • Construction Period Pollution Prevention and Erosion_ and Sedimentatiori `Control Plan required by Standard 82 , • Operation and Maintenance Plan required by Standard 9 In addition to all plans and supporting information, the Stormwater Report must include a brief narrative describing stormwater management practices, including environmentally sensitive site design and LID techniques, along with a diagram depicting runoff through the proposed BMP treatment train. Plans are required to show existing and proposed conditions, identify all wetland resource areas, NRCS soil types, critical areas, Land Uses with Higher Potential Pollutant Loads (LUHPPL), and any areas on the site . where infiltration rate is greater than 2.4 inches per hour. The Plans shall identify the drainage areas for both existing and proposed conditions at a scale that enables verification of supporting calculations. ~ As noted in the Checklist, the Stormwater Management Report shall document compliance with each of ~ the Stormwater Management Standards as provided in the Massachusetts Stormwater Handbook. The soils evaluation and calculations shall be done using the methodologies set forth in Volume 3 of the Massachusetts Stormwater Handbook. U To ensure that the Stormwater Report is complete, applicants are required to fill in the Stormwater Report U Checklist by cheeking.the box to indicate that the specified information has Been included in the ~~ Stormwater Report ;If any of the Information specified in the checklist has not been submitted, the - l" applicant must provide arl.explaliatlon: fie completed Stormwater Report Checklist and Certification (~ must be submitted with the Stormwater Report. O O O 'J 'The Stormwater Report may also include the Illicit Discharge Compliance Statement required by Standard 10. If not included in U the Stormwater Report, the Illicit Discharge Compliance Statement must be submitted prior to the discharge of stormwater runoff to the post-construction best management practices. L.~ 2 For some complex projects, it may not be possible to include the Construction Period Erosion and Sedimentation Control Plan in the Stormwater Report. In that event, the issuing authority has the discretion to issue an Order of Conditions that approves the project and includes a condition requiring the proponent to submit the Construction Period Erosion and Sedimentation Control Plan J before commencing any land disturbance activity on the site. rJ J f~ \ Bureau of Resouri~ ratec#ion -Wetlands Program ~~i Checklist for Stormwater Report - B. Stormwater Checklist and Certification The following checklist is intended to serve as a guide for applicants as to the elements that ordinarily -need to be addressed in a complete Stormwater Report:. The checklist is also intended to provide conservation commissions and other reviewing authorities with a summary of the components neces ary for a comprehensive Stormwater Repoit that addresses the ten Stormwater Standards. Note: Because stormwater requirements-vary from project to project,, it is possible that a complete Stormwater Report may not include information on some of the subjects specified in the Checklist. If it is determined that a -specific item does not apply to the project ander review,. please note that the item is not applicable (tV:A.) and: provide-the reasons.for hat detecrnination. A complete~checklist must include•the Cerfificat'ion setfibrth below signed by the Registered Professional Engineer~who prepared the Stocmwafer Repori~ Registered Professional Engineer's Certification I have: reviewed the Stormwater Report; including .the soil evaluation, computations, Longterm Pollution Prevention Plart, the Construction Period Erosian and Sedimentation Control Plan (if included), the Long- term Post-Construe#ion Operation and Maintenance Plan, the; ltlicit Discharge Gomptiance Statement (if included) and the plans showing' the stornwater management: system, 'and have. determined that they 'haue been prepared in accordance-with the requirements of the Stormwater Management Standards as. .further elaborated bythe Massachusetts Stormwater'Nandbook. l have alS.o determined that the nfocmation:presented in tlie. Starrnwater Cltecklist~is accurate and that the> information presented in the 5torrnwater Report accurate! refl is c~nditio sat , site as f the date oft is permit application. Registered Professional Engrneer Block•and~Sigrlattare MAt~K B. oastr~o~-o bM~ ~a, 32459 Gheckl~st - Pcoject.Type: is .the application. for rt'ew development, redevelopment;. or a:mix of new and rectevelcprnent? ~ New developmelnt ^ Redevelopment ^ Mix. of New Development and Redevelopment 1. Kohl PIA swchecklist • 04/01!08 Stormwater Report Checklist • Page 2 of 8 /~ ^) r~ ~-~ ~~ ~~ n 0 ~~ C_~ n n ~~ 0 ~~ ~~ O O C~ O l__J -, '. J ~~~ Massachusetts~Department of Environmental Protection Bureau of Resource Protection -Wetlands Program - Checklist for Stormwater Report Checklist (continued) LID Measures: Stormwater Standards require LID measures to be considered. Document what environmentally sensitive design and LID Techniques were considered during the planning and design of the project: ®No disturbahce to any Wetland Resource Areas ^ Site Design Practices (e.g. clustered development, reduced frontage setbacks) ^ Reduced Impervious Area (Redevelopment Only) ® .Minimizing disturbance to existing trees and shrubs ^ LID Site Design Credit Requested: ^ Credit 1 ^ Credit 2 ^ Credit 3 ® Use of "country drainage" versus curb and gutter conveyance and pipe ® Bioretention Cells (includes Rain Gardens) ^ Constructed Stormwater Wetlands (includes Gravel Wetlands designs) ^ Treebox Filter ® Water Quality Swale ® Grass Channel ^ Green Roof ^ =Other (describe).: Standard 1: No New Untreated Discharges ® No new untreated discharges ® Outlets have been designed so there is no erosion or scour to wetlands and waters of the Commonwealth ® Supporting calculations specified in Volume 3 of the Massachusetts Stormwater Handbook included. 1. Kohl NA swchecklist • 04/01 /08 Stormwater Report Checklist • Page 3 of 8 ~.~ /~ Massachusetts DC ~artment of Environmental Protecrron Bureau of Resource Protection -Wetlands Program Checklist for Stormwater Report Checklist (continued) Standard 2: Peak Rate Attenuation ^ .Standard 2 waiver requested because the project is located in land subject to coastal storm flowage and stormwater discharge is to a wetland subject to coastal flooding. ^ Evaluation provided to determine whether off-site flooding increases during the 100-year 24-hour storm. ® Calculations provided to show that post-development peak discharge rates do not exceed pre- development rates for the 2-year and 10-year 24-hour storms. If evaluation shows that off-site flooding increases during the 100-year 24-hour storm, calculations are also provided to show that .post-development peak discharge rates do not exceed pre-development rates for the 100-year 24- hourstorm. Standard 3: Recharge ® Soil Analysis provided. ® Required Recharge Volume calculation provided. ^ Required Recharge volume reduced through use of the LID site Design Credits. ® Sizing the infiltration, BMPs is based on the following method: Check the method used. ® Static ^ Simple Dynamic ^ Dynamic Field' ^ Runoff from all impervious areas at the site discharging to the infiltration BMP. ^ Runoff from all impervious areas at the site is not discharging to the infiltration BMP and calculations are provided showing that the drainage area contributing runoff to the infiltration BMPs is sufficient to generate the required recharge volume. ® Recharge BMPs have been sized to infiltrate the Required Recharge Volume for its respective drainage area. ® :Recharge BMPs have been sized to infiltrate the Required Recharge Volume only to the maximum extent practicable for the following reason: `® Site is .comprised solely of C and D soils and/or bedrock at the land surface ^ M.G.L. c. 21 E sites pursuant to 310 CMR 40.0000 ^ Solid Waste Landfill pursuant to 310 CMR 19.000, ® Project is otherwise subject to Stormwater Management Standards only to the maximum extent practicable. ® Calculations showing that the infiltration BMPs will drain in 72 hours are provided. ^ Property includes a M.G.L. c. 21 E site or a solid waste landfill and a mounding analysis is included. 80% TSS removal is required prior to discharge to infiltration BMP if Dynamic Field method is used. NA swchecklist • 04/01 /08 Stormwater Report Checklist • Page 4 of 8 ~~ C~> n ~~ 0 ~~~ (~~ Massachusetts vepartment of Environmental Protection Bureau of Resource Protection -Wetlands Program Checklist for Stormwater Report ~ ~ Checklist (continued) n ~ Standard 3: Recharge (continued) ^ The infiltration BMP is used to attenuate peak flows during storms greater than or equal to the 10- (~ year 24-hour storm and separation to seasonal high groundwater is less than 4 feet and a mounding ~ analysis is provided. ~-~ ^ Documentation is provided showing that infiltration BMPs do not adversely impact nearby wetland resource areas. Standard 4: Water Quality ~ The Long-Term Pollution Prevention Plan typically includes the following: ~~ • Good housekeeping practices; Provisions for storing materials and waste products inside or under cover; ~ Vehicle washing. controls; ~ Requirements for routine inspections and maintenance of stormwater BMPs; • Spill prevention and response plans; ~~ Provisions for maintenance of lawns, gardens, and other landscaped areas; ~~ Requirements for storage and use of fertilizers, herbicides, and pesticides; ~ • Pet waste management provisions; Provisions for operation and management of septic systems; ~ Provisions for solid waste management; O Snow disposal and plowing plans relative to Wetland Resource Areas; • Winter Road Salt and/or Sand Use and Storage restrictions; ~} Street sweeping schedules; ~ Provisions for prevention of illicit discharges to the stormwater management system;. • Documentation that Stormwater BMPs are designed to provide for shutdown and containment in the 0 event of a spill or discharges to or near critical areas or from LUHPPL; ~ Training for staff or personnel involved with implementing Long-Term Pollution Prevention Plan; • List of Emergency contacts for implementing Long-Term Pollution Prevention Plan. ® A Long-Term Pollution Prevention Plan is attached to Stormwater Report and is included as an attachment to the Wetlands Notice of Intent. ~.~ ^ Treatment:BMPs subject to the 44%TSS removal pretreatment requirement and the one inch rule for O calculating the water quality volume are included, and discharge: ~~ ^ is.vvithin the Zone II or Interim`Wellhead Protectiori Area ~ ^ is near or to other critical areas 0 ~ ^ is within soils with a rapid. infiltration rate (greater than 2.4 inches per hour) (~ ^ involves runoff from land uses with higher potential pollutant loads. ~ ~ ^ The Required Water Quality Volume is reduced through use of the LID site Design Credits. ~ ® Calculations documenting that the treatment train meets the 80%TSS removal requirement and, if U applicable, the 44% TSS removal pretreatment requirement, are provided. CJ U U ~-% 1. Kohl NA swchecklist • 04/01/08 Stormwater Report Checklist • Page 5 of 8 ~. _) ,/ Massachusetts C~~partment of Environmental Prote ~~on Bureau of Resource Protection -Wetlands Program Checklist for Storm rater Report- Checklist (continued) Standard 4: Water Quality (continued) ® The BMP is sized (and calculations provided) based on: ® The'h" or 1"Water Quality Volume or ^ The equivalent flow rate associated with the Water Quality Volume and documentation is provided showing that the BMP treats the required water quality volume. ® The applicant proposes to use proprietary BMPs, and documentation supporting use of proprietary BMP and proposed TSS removal rate is provided. This documentation maybe in the form of the propriety BMP checklist found in Volume 2, Chapter 4 of the Massachusetts Stormwater Handbook and submitting copies of the TARP Report, STEP Report, and/or other third party studies verifying performance of the proprietary BMPs. ^ A TMDL exists that indicates a need to reduce pollutants other than TSS and documentation showing that the BMPs selected are consistent with the TMDL is provided. Standard 5: Land Uses With Higher Potential Pollutant Loads {LUHPPLs) Not Applicable - Proposed project site is not expected to yield high potential pollutant loads. ^ The NPDES Multi-Sector General.Permit covers the land use and the Stormwater Pollution Prevention Plan (SWPPP) has been included with the Stormwater Report. ^ The NPDES Multi-Sector General Permit covers the land use and the SWPPP will be submitted prior to the discharge of stormwater to the post-construction stormwater BMPs. ^ The NPDES Multi-Sector General Permit does not cover the land use. ^ LUHPPLs are located at the site and industry specific source control and pollution prevention measures have been proposed to reduce or eliminate the exposure of LUHPPLs to rain, snow, snow melt and runoff, and been included in the -long term Pollution Prevention Plan. ^ All exposure has been eliminated. ^ All exposure has not been eliminated and all BMPs selected are on MassDEP LUHPPL list. ^ The LUHPPL has the potential to generate runoff with moderate to higher concentrations of oil and grease (e:g. all parking lots with >1000 :vehicle trips per day) and the treatment train includes an oil grit separator; a filtering bioretention area; asand-filter.or equivalent. Standard 6: Critical Areas Not Applicable -The project site does not discharge to a critical area. ^ The discharge is near or to a critical area and the treatment train includes only BMPs that MassDEP has approved for stormwater discharges to or near that particular class of critical area. ^ Critical areas and BMPs are identified in the Stormwater Report. 1. Kohl NA swchecklist • 04/01/08 Stormwater Report Checklist • Page 6 of 8 C-~ _-) n n ~~ n ~~ ~) Massachusetts Department of Environmental Protection Bureau of Resource Protection -Wetlands Program Checklist for Stormwater Report Checklist (continued) Standard 7: Redevelopments and Other Projects Subject to the Standards only to the maximum extent practicable ® The project is subject to the Stormwater Management Standards only to the maximum Extent Practicable as a:site with only "Hydrologic Group C" Soils ^ Limited'Project ^ Small Residential Projects: 5-9 single family houses or~5-9 units in amulti-family development provided there is no discharge that may potentially affect a critical area. ^ Small Residential Projects: 2-4 single family houses or 2-4 units in amulti-family development with a discharge to a critical area ^ Marina and/or boatyard provided the hull painting, service and maintenance areas are protected from exposure to rain, snow, snow melt and runoff ^ Bike Path and/or Foot Path ~~ 0 0 0 0 ~~ ~~ ~~ O O 0 U ~~ j r"1 ^ Redevelopment Project ^ Redevelopment portion of mix of new and redevelopment. ~, ® Certain standards are not fully met (Standard No. 1, 8, 9, and 10 must always be fully met) and an explanation of why these standards are not met is contained in the Stormwater Report. ^ The project involves redevelopment.and adescription of all measures that have been taken to improve existing conditions is provided in the Stormwater Report. The redevelopment checklist found in Volume 2. Chapter 3 of the Massachusetts Stormwater Handbook may be used to document that the proposed stormwater management system (a) complies with Standards 2, 3 and the pretreatment and structural BMP requirements of Standards 4-6 to the maximum extent practicable and (b) improves existing conditions. Standard 8: Construction Period Pollution Prevention and Erosion and Sedimentation Control A Construction Period Pollution Prevention and Erosion and Sedimentation Control Plan must include the following information: • Narrative; • Construction Period Operation and Maintenance Plan; Names of Persons or Entity Responsible for Plan Compliance; • Construction Period Pollution Prevention Measures; • Ecosiorrand Sedimentation Control Plan Drawings; • Detail drawings and specifications for erosion control BMPs, including sizing calculations; • Vegetation Planning; • Site Development Plan; • Construction Sequencing Plan; • Sequencing of Erosion and Sedimentation Controls; • Operation and Maintenance of Erosion and Sedimentation Controls; • Inspection Schedule; • Maintenance Schedule; • Inspection and Maintenance Log Form. ® A Construction Period Pollution Prevention and Erosion and Sedimentation Control Plan containing the information set forth above has been included in the Stormwater Report. 1. Kohl NA swchecklist • 04/01/08 Stormwater Report Checklist • Page 7 of 8 ~~ Massachusetts G ~artment of Environmental Protec, ~on Bureau of Resource Protection -Wetlands Program Checklist for. Stormwater Report Checklist (continued) Standard 8: Construction Period Pollution Prevention and Erosion and Sedimentation Control (continued) ^ The project is highly complex and information is included in the Stormwater Report that explains why it is not possible to submit the Construction Period Pollution Prevention and Erosion and Sedimentation Control Plan with the application. A Construction Period Pollution Prevention and Erosion and Sedimentation Control has not been included in the Stormwater Report but will be submitted before land disturbance begins. ^ The project is not covered by a NPDES Construction General Permit. ® The project is covered by a NPDES Construction General Permit and a copy of the DRAFT SWPPP is in the Stormwater Report. ^ The project'is covered by a NPDES Construction General Permit but no SWPPP been submitted. The SWPPP will be submitted BEFORE land disturbance begins. Standard 9: Operation and Maintenance Plan ® The Post Construction Operation and Maintenance Plan is included in the Stormwater Report and includes the following information: ® Name of the stormwater management system owners; ® Party responsible for operation and maintenance; ® Schedule for implementation of routine and non-routine maintenance tasks; ^ Plan showing the location of all stormwater BMPs maintenance access areas; ^ Description and delineation of public safety features; ^ Estimated operation and maintenance budget; and ® Operation and Maintenance Log Form. ^ The responsible party is not the owner of the parcel where the BMP is located and the Stormwater Report includes the following submissions: ^ A copy of the legal instrument-(deed, homeowner's association,. utility trust or other legal entity) that establishes the terms of and legal responsibility for the operation and maintenance of the project site stormwater BMPs; ^ A plan and easement deed that allows site access for the legal entity to operate and maintain BMP functions. Standard 10: Prohibition of Illicit Discharges ^ The Long-Term Pollution Prevention Plan includes measures to prevent illicit discharges; ^ An Illicit Discharge Compliance Statement is attached; ® NO Illicit Discharge Compliance Statement is attached but will be submitted prior to the discharge of any stormwater to post-construction BMPs. 1. Kohl NA swchecklist • 04/01 /08 Stormwater Report Checklist • Page 8 of 8 \ / // Northern Avenue November 11, 2008 Northampton, Massachusetts Stormwater Drainage Report I. Introduction The following report presents an analysis of the stormwater management system for the proposed development of 25 housing units located off of Northern Avenue in zoning district URB in Northampton, Massachusetts. The proposed development includes 25 new housing units and associated parking areas, driveways, and sidewalks, utilities, landscape features and stormwater management system. The total site area is approximately 6 acres of which approximately 3.4 will be disturbed by construction activities. The impervious area on site will increase due to the new development and the stormwater management system has been designed to minimize proposed peak flows ~to reduce or match existing flows off the site. Mechanisms to reduce runoff and treat water quality include a rain garden, a proprietary treatment chamber, infiltration trench, dry wells, deep sump hooded catch basins, and 2 detention basins. II. Site Terrain and Soils The project site is comprised of gradual sloping terrain, which generally drains toward the wetlands on the west part of the site. The USDA Soil Survey of Hampshire County, Massachusetts, Central Part report classifies the site soils as (see attached soil map): • (Ra) Raynham Silt Loam Hydrologic Group: C Flood Risk: None Depth to Water Table: 0.5'-2.0' Depth to Bedrock: >60" • (Au) Amostown-Windsor Silty Substratum Hydrologic Group: C Flood Risk: None Depth to Water Table: 1.5'-3.0' Depth to Bedrock: >60" • (Ud) Udorthents Smooth Soil formed by cutting or filling developed area. Reference pedon not given. Assumed Hydrologic Group: C The Berkshire Design Group, Inc. Page 2 ~~ ~~ Northern Avenue I~lovember 11, 2008 Northampton, Massachusetts Stormwater Drainage Report A series of test pits were conducted on site to determine subsurface conditions. The purpose of the test pits was to evaluate the site for the existence of ledge, the ability of the site to support stormwater drainage components, and for groundwater information. In general, the test pits confirmed the USDA Soil Survey findings for the site as ground water is generally very high throughout the site, thereby reducing the potential areas where infiltration would be feasible. The test pit logs are attached in Appendix B. III. Existing Conditions The existing site includes one drainage area: E-1. The existing drainage area boundary is depicted on the Pre-Development Drainage Area Plan (Figure 1). The overall curve number (CN) in existing conditions is 74. The control point to determine peak flow in existing conditions is the stream located on the property line west of the site shown on Figure 1 as E-CP. The following is a brief description of the drainage area: O E-1 O E-1 is approximately 7.75 acres in size and contains existing houses, pavement, O grass, wooded areas, and a large wetland area on the west part of the site. Runoff flows overland in a southwestern direction through the wetlands and to the stream O located southwest of the site. U O IV. Proposed Conditions O The stormwater management system in proposed conditions has been designed to (~ treat and reduce runoff on site. The proposed site contains eight drainage areas: O P-l, P-2, P-3, P-4, P-5, P-6, P-7 and P-8 (Figure 2) and the overall curve number (CN) in proposed conditions is 80. The control point to determine peak flow in O proposed conditions is the stream located on the property line located west of the O site shown on Figure 2 as P-CP. The following is a brief description of each O drainage.~area: P-1 P-1 is approximately 4.99 acres in size and contains the northwestern area of the site consisting of all of the wetland area, grass and wooded areas, and new roof and pavement. The drainage follows a similar pattern as in existing conditions. It flows overland in a southwestern direction through the wetlands and to the stream located southwest of the site. The runoff from the back of the new roof areas located within P-1 are directed to dry wells where the water is infiltrated into the ground. These dry wells are designed to be very shallow (approximately one foot in depth) due to high groundwater throughout the site. The dry wells are designed with an overflow outlet that allows roof water to sheet flow across the land toward the wetlands as it does in existing conditions. The new driveway and front roof The Berkshire Design Group, Inc. Page3 /.i i l ~ ~ _ ./ Northern Avenue November 11, 2008 Northampton, Massachusetts Stormwater Drainage Report areas of units 1 and. 2 will flow in a similar pattern as the pavement and grass area does in existing conditions. P-2 P-2 is approximately 0.24 acres in size and is located in the eastern portion of the site. It contains a portion of the roof from unit 14 and 15 in which runoff flows through roof leaders into the infiltration trench which overflows into a catch basin within the area. This area also contains a small portion of new pavement, grass, and trees. Excluding the roof, all other runoff from this area is directed into a catch basin which flows into a water quality basin then to a detention basin (DB#2) located on the west part of the site. P-3 P-3 is approximately 0.65 acres in size and is located in the northeastern part of the site: It contains new pavement and roof areas, grass, and a detention basin. Runoff from this area is directed to a water quality swale which flows into a water catch basin followed by a detentionlinfiltration basin (DB#1) that discharges approximately 100 ft to the south. P-4 P-4 is approximately 0.34 acres in size in the east part of the site. It contains a portion of the new roof and pavement area, and grass and wooded areas. Runoff flows into a catch basin which directs the water to the infiltration trench noted is area P-2. The runoff follows the same pattern as area P-2 once within the trench. P-5 P-5 is approximately-0.19 acres in size and is located toward the center of the developed portion of the site. It contains mostly new pavement and roof areas and a small portion is grass and wooded area. Runoff flows into a catch basin where it is directed to a water quality basin and detention basin (DB#2) which discharges approximately 40ft from the wetland, allowing adequate overland flow to occur. P-6 P-6 is approximately 0.54 acres in size and is located on the south portion of the site. Itcontains a portion of the roof :areas from units 16-21, new pavement; and grassed areas. The runoff is directed to a grass swale which flows into a catch basin. The catch basin flows through a proprietary stormwater treatment chamber that discharges into a detention basin (DB#2). P-7 P-7 is approximately 0.27 acres in size and is located on the southwestern portion of the site. It contains approximately mostly new roof and paved areas and only a small portion of the area is grass. The runoff flows southwest to a proprietary treatment chamber which discharges into a detention basin (DB#2). The Berkshire Design Group, Inc. Page 4 ~) ~1 Northern Avenue November 11, 2008 Northampton, Massachusetts Stormwater Drainage Report P-8 P-8 is approximately 0.53 acres in size and is located on the southwestern portion of the site. It contains a portion of the roof areas from units 22-25, new paved area, grass, and a detention basin (DB#2) and water quality basin. The paved area flows through a pre treatment system consisting of a stone diaphragm and grassed area which discharges into the water quality basin (rain garden) which overflows into the detention basin. The remaining area of P-8 sheet flows into the detention basin. V. Calculations and Design Drainage calculations were performed on Hydrocad Stormwater Modeling System version 8.0 using Soil Conservation Service (SCS) TR-20 methodology. The SCS method is based on rainfall observations, which were used to develop the Intensity-Duration-Frequency relationship, or IDF curve. The mass curve is a dimensionless distribution of rainfall over time, which indicates the fraction of the'. rainfall event that occurs at a given time within a 24-hour precipitation event. This synthetic distribution develops peak rates for storms of varying duration and intensities. The SCS distribution provides a cumulative rainfall at any point in time and allows volume dependent routing runoff calculations to occur. These calculations are included in the appendices. The watershed boundaries for calculation purposes are divided according to the proposed site grading and the natural limits of the drainage areas. The curve numbers (CNs) and times of concentration for the existing and proposed subcatchment areas are based on the soil type and the existing and proposed cover conditions at the site. The soil hydrologic group assumed for the site is noted in Figure 3. Watershed subcatchment areas, runoff coefficients and watercourse slopes are based on survey information. Calculations were performed for the 2-, 10-, and 100-year frequency storms under `ex'isting-and proposed conditions. The results of the calculations are presented in Table 1.on the following page. Appendix A presents 'the Hydrocad calculations. Flow Rates & Water Quantity In the post development conditions the runoff from the proposed site will be routed to 2 open detention basins located along west part of the developed site. The proposed detention basins will attenuate peak flows in the proposed conditions through the use of outlet control structures. Stormwater will be discharged to the wetland that receives runoff in existing conditions. Although there are 6 infiltration systems are proposed (1 detention/infiltration basin, 4 dry wells and 1 infiltration trench) these were not included in the hydrocad The Berkshire Design Group, Inc. Page 5 Northern Avenue - November i 1, 2008 Northampton, Massachusetts Stormwater Drainage Report calculations in order to provide a more conservative runoff quantity. Table 1 on the following page presents the comparison of flow rates and water quantity at both existing and proposed control points. Table 1 Peak Flow and Volume Summary Condition & Point of Analysis 2-Year Storm 3.00" 10-Year Storm 4.50" 100-Year Storm 6.50" Peak Flow Volume Peak Flow Volume Peak Flow Volume Rate(cfs) (acre-ft) Rate(cfs) (acre-ft) Rate(cfs) (acre-ft) pa. x:t y ` gym:. 't.d ~ ~ < 51111 ~ ~~~ . '"~.~'.,4• a~? "ilY%'~n9 E,~r"r'i~"rk~xlS t ~c~'~~ ~t,''`~~~;~tr 4F., ~E~S ~ '~akP ?s ~' i~~i,('f Pmt: 'ZS ~r ~.~~it'~' i ye ~~, ~~, ~~'~.fa~• to \r w %~ ~ } 4b' '~T 1 t i ~ i ~ ' {ra~i$,~x&`'%~'~~a~~,ai ~~, ~ ~ /F 7k1~ '4 L4 5 ifi~ xrw,s~'~ r,' ~e ~~~¢¢ ~ { rth~ ~~'C , ..pp , ;~x 1 1S E '~ t1{. r p ~'~~~~ , u ' ` ./ t 1 Y 7~ q •*~ .~~j~ i 's{ f' f,~+ CC r ~e~U~~"`5F` ~~~~~~ ~~Sf~ S ~ ~ y . F ~ k } U5 r Z 4kA 1 a° Yn,P F i ~r ~. ~ 't ,1, ,~ '`~~~~a-'~`e N'UIE'~'hln ,~' '~ ~ ' ~ , ~ c k rt. ~ Y X 7 1C.C. f ~"' '~tj 7~{ ~ ~s ~`;~ss '~~ ' ~ e ~k d ST:~ ~k !t'}1Y Y; ~~~~~~~: e ~ ~ X ' : ~ ~ l.y~,,+~ }3 F ~ '+W' j'~M r vs~.4 ~crfi ~ ' f Nix ~e4;r 11,~x~„~ k L' 4' ~ cf ~'~ ~~:/t~~'i~~l'"L>~~~R~!'.1.~6'~~~1 ,~ t~ .y G ~"~ i u ~ ~ !t 4ti~tS1 4 vu~~ ~S'Si { t~ 41 f.~=likCTb~At`~'~.~ ti ~:YY ~....~~ ~~{ Yn taN~ACCEi11~r i` ff ~ ~fi fi cka 41 I 4~\ v3p~~' { j~{ F~Nq'~YRE'/i"~~lC "'~' } .u ~i ~-~'~ 'A4~y~~~~,~ ~\~~,~ ~. 4a Y ..I?}"n~Lxh; ~[a ~~~'1w .vii' . .. + .Id ' S1 G '. 4 a ~~ fl *Names in parentheses refer to HydroCad model and calculations. VI. MADEP Stormwater Standards Compliance The following section details how the project will meet DEP Stormwater Management Policy's ten stormwater management standards. Standard 1 -Untreated Stormwater The proposed Stormwater system is designed to treat the new point source discharge prior to flowing to the resource area. All new outlets are outfitted with flared ends and rip rap to prevent any erosion from occurring in the area. See Appendix C for TSS removal summary. Standard 2 -Post-Development Peak Dischar eg_ Rates The stormwater system is designed so .that post-development peak discharge rates do not exceed pre-development peak discharge rates leaving the site. In order to reduce runoff rates in proposed conditions 2 detention basins with outlet control structures are proposed. Note that: although 6 infiltration systems are proposed, no enfiltration was included in the runoff calculations in order to maintain a more conservative peak discharge rate. Refer to Table 1 Peak Flow and Volume Summary and Appendix A for HydroCAD calculations. Standard 3 -Recharge to Groundwater Recharge to groundwater is designed to infiltrate to the maximum extent practicable in proposed conditions. The entire site consists of hydrologic group "C" soils and there is very high groundwater throughout most of the site (see Appendix B for test pit logs). The soil conditions caused limitations for infiltration on many areas of the site because the separation of 2 feet from The Berkshire Design Group, Inc. Page 6 ~, I Northern Avenue Novem-her 11, 2008 Northampton, Massachusetts Stormwater Drainage Report groundwater could not be met. Where possible, infiltration is proposed: half of the areas of the roof from units 1-15 and 22-25 and a portion of the pavement located toward the center of the development are directed to dry wells and an infiltration trench sized to accommodate these areas. The upper detention/infiltration basin (DB#1) has been designed also hold and infiltrate the required recharge volume for its respective drainage area (see Appendix D for recharge calculations). Due to restrictions of the site terrain and soil conditions, not all of the impervious area could be directed to an infiltration system, therefore all 6 of the infiltration systems proposed are designed to hold at least twice the required recharge volume and still drawdown within 72 hours in order to meet Standard 3 to the maximum extent practicable (see Appendix D for recharge calculations). (~ Standard 4 -Water Quality ~~ The proposed stormwater management system has been designed to remove the average annual Total Suspended Solids (TSS) load in excess of 80% for the proposed site conditions (see Appendix C for calculations). There are 4 separate ~ treatment chains proposed: ~~ Treatment Train 1(total of 85% TSS removed) _ ~ ~ The first treatment chain contains the impervious areas within P-3. The runoff is directed into a water quality swale to a catch basin which discharges into (~ detention/infiltration basin (DB#1) which has been designed to hold the required ~ water quality volume for its respective area which achieves a total TSS removal ~~ rate of approximately 85%. Note that the water quality swale was not included in the calculations of total TSS removal in Appendix C to maintain a more ~ conservative removal rate. O Treatment Train 2(total of 93%TSS removed) ~ The second treatment chain contains the impervious areas from P-2, P-4, and P-5. The runoff is directed into a catch basins followed by a water quality basin (rain ~ garden) which achieves a total TSS removal rate of approximately 93%. The ~ water quality basin has been designed to hold a larger volume of water (738cf) ~ than the water quality volume required (713cf) for the impervious area directed to it. J Treatment Train 3(total of 90% TSS removed) ' The second treatment chain contains the paved impervious areas from P-8. The ~_~ ~` ~ runoff is through a pretreatment system consisting of a stone diaphragm and - grassed area which discharges into a water quality basin (rain garden) which ~ achieves a total TSS removal rate of approximately 90%. The water quality basin J has been designed to hold a larger volume of water (738cf) than the water quality ~~ volume required (713cf) for the impervious area directed to it. L,~ :,`~ The Berkshire Design Group, Inc. Page 7 '._~ %~ /, _. ~ Northern Avenue November 11, 2008 Northampton, Massachusetts ~ Stormwater Drainage Report Treatment Train 4(total of 83%TSS removed) The third treatment chain contains the impervious areas from P-6 and P-7. The runoff is directed into catch basins and then to a proprietary treatment chamber (Stormceptor STC 900*) which achieves a total TSS removal rate of approximately 83%. *1Vote: The stormwater treatment chamber has been sized based on MASTEP test evaluations. The attached table in appendix C displays TSS removal rates for systems based on the impervious area directed to the system. See attached Stormceptor sizing chart for impervious areas directed to the stormwater treatment chamber. In addition to removal of TSS, a Long Term Pollution Prevention Plan has been created to maintain a clean site and ensure that all BMPs are functioning to their maximum potential. See Appendix F for Long Term Pollution Prevention Plan. Standard 5 - Higher Potential Pollutant Loads The proposed project is not expected to yield high potential pollutant loads. Standard 6 -Protection of Critical Areas The project site does not discharge to critical areas as defined in MA DEP 5tormwater Policy Handbook. Standard 7 -Redevelopment Projects The redevelopment of previously developed site standard is not applicable for this project. Standard 8 - Erosion/Sediment Control Erosion and sediment controls have been incorporated into the project design to prevent erosion, control sediments, and stabilized exposed soils during construction and land. disturbance.. See Appendix G for Construction Period Pollution Prevention and Erosion Sedimentation Control. Standard 9 - Ogeration/1Vlantenance Plan An Operation and Maintenance Plan for the proposed project is included in Appendix E. It includes general controls for construction and long term maintenance of the stormwater management system. Standard 10 -Prohibition of Illicit Discharges No Illicit Discharge Compliance Statement is included with this report however one will be submitted prior to the discharge of any stormwater to post- construction BMPs. The Berkshire Design Group, Inc. Page 8 ~~) ~~ Northern Avenue November 1 L, 2008 Northampton, Massachusetts VII. Summary Stormwater Drainage Report The impervious area from existing to proposed conditions will increase by approximately 51,000 sf from the new roadway and housing units. The proposed stormwater management system is designed to maintain or reduce the peak flow rates in proposed conditions for the 2-, 10-, and 100-year storm frequencies. Special care has been taken to treat runoff with a series of best management practices to ensure water quality and annual TSS removal rates in excess of 80%. These methods include deep sump hooded catch basins; a bioretention basin, a detention/infiltrationbasfn, and a stormwater treatment chamber. VIII. References United States Department of Agriculture. 1998. Soil Survey of Hampshire County (Central Part), Massachusetts. The Berkshire Design Group, Inc. Page 9 Northern Avenue ~~ ~ November 11, 2008 Northampton, Massachusetts Stormwater Drainage Report Appendix Fi ures The Berkshire Design Group, Inc. Appendix U r -1 i~ n ~~ ~~ ~`~~ gQQ !!~~ ---"- - - -~~~. •~ '~i~e .~. ---' 104QG' ~- ~ f ~ ~ ~r ;'~ ol,'~ ••i j' • F , ' ' ' ' V, f0 ~'~ ~/ ~ m ,i'~~~:• ~• is y .~i~ 1 '' .^~~,~ ~ ' wrGl-% '~ t~'~ ~ I~:-. , PLAN ~~ ~~, ..~-..--° >'° \ i_ ~ . I, ii. 'fi'r ., - ~ -: - rf ! c~~ _ - :-_ .- _ ;_ ". -';, ' r~~:2 1 _ 1 1, •~ ~. .. -. ,- -. =~~ .- • ~ - (~ ---- ---- --;-----" - , ~,','' ~ !~ is •©~:%~ - `\' ~~'_ _ ~ ' " ' !~ -'•-`110.89' ~.. ~::: U "~ . ~~ S ~ ~!! [ ~ ~ • '' ~~` ~~ ~~ ~ .fit: H ~t aa 9os7 . A 888 '~~~~ ~~i ~~ ~--r-~r~r- ,_~' ~~,~~ ii ~~ ~~' ~ q q~~i~~~R'J m ~' :•:'~• O C l ~~~ ~ ~D A ~I ~T~~~ ~~~ ~ ~~. ~m ~ ~ ~~ §~~ t ~~~ U <~ - ` ~~ P _ ~ J NtDE ~ s~ ~_/ ~~f r` j _:~ - tm-an +EIN1E CONDOIIAIIUJA }f2, PACE 179 ~ 187, PACE 150 ~i .~' r ~ S i ~K I K ~g > ~. ray P ~~ The Figure Title: 0 9nire G I Pre-Development Drainage Area Map roup, nc. 4AIIenPlace Norfhampton,Massachusetts01060 NORTHERN AVENUE HOUSING (413) 582-7000. • FAX (413) 582-7005 _ NORTHAMPTON __-, ____..., _.. MASSACNUSET_TS_ i~. Reference: Figure Number Date: Scale: _ 11/11/08 1=1A0'_.. __ ~'j Northern Avenue -- ' November 11, 2008 Northampton, Massachusetts Stormwater Drainage Report Appendix Appendix A -Pre- and Post Development Hydrologic Calculations The Berkshire Design Group, Inc. Appendix ~~ ._~ __ ~x - ^ East area t infiltratidaentr east area to Northea t Area tre h DB2 Existing onditions Central east area tf. r "'Bir ~~ ~~F. ,_<<., s ExFC'P , ;a.~-5~::;;,~ Detention asin #1 .~ South Area to D62 ~3 Control Point-Stream at ~ B ~'' ~. PL . ~ etention Basin #2 ' ' _ ~ South Central area to West Area DB2 ~ P ~,, P ...f~„r. ;` ;~.~ .. Control Point -Stream at PL South Central area to D62 ~'~~ fi ~ ,S ~ '` ~~a ~ Rea%,h , pn ~ ".~ -j,. .~~~ ~Lrn~k` ~~ 4aMVy~f I`~1 /., Northern Avenue Housing-Active Prepared by The Berkshire Design Group Page 2 HydroCAD® 8.00 s/n 000752 ©2006 HydroCAD Software Solutions LLC 11/12/2008 Area Listing (selected nodes) Area (acres) CN Description (subcatsl 5.581 70 Woods, Good, HSG C (E-1,P-1,P-3,P-4,P-5,P-6) 3.482 74 >75% Grass cover, Good, HSG C (E-1, P-1, P-2, P-4, P-5, P-6, P-6, P-7, P-8) 4.416 78 Wetlands (E-1,P-1) 0.257 79 50-75% Grass cover, Fair, HSG C (P-3) 0.135 98 Imp. Bldgs, Pavement (E-1) 1.299 98 Paved parking & roofs (P-1,P-2,P-3,P-4,P-5,P-6,P-7,P-8) 0.290 100 Det Basin (P-3,P-8) 0.034 100 Rain Garden (P-8) 15.496 (~ n ~~~ ~-~ ~ - l~ ~ Northern Avenue Housing-Active Type 1112-4-hr 2-Year Rainfall=2.95" ~~ Prepared by The Berkshire Design Group Page 3 ~--~ HydroCAD® 8.00 s/n 000752 ©2006 HydroCAD Software Solutions LLC 11/12/2008 ~~ Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points (~ Runoff by SCS TR-20 method, UH=SCS ~ Reach routing by Stor-Ind+Trans method -Pond routing by Stor-Ind method ~ Subcatchment E-1: Existing Conditions Runoff Area=337,494 sf Runoff Depth>0.87" ~ Flow Length=570' Tc=23.1 min CN=74 Runoff=4.66 cfs 0.563 of ~ Subcatchment P-1: West Area n n ~-~ Subcatchment P-2: Central east area O Subcatchment P-3: Northeast Area Runoff Area=218,209 sf Runoff Depth>0.98" Flow Length=351' Tc=19.8 min CN=76 Runoff=3.68 cfs 0.408 of Runoff Area=8,669 sf. Runoff Depth>0.98" Tc=5.0 min CN=76 Runoff=0.22 cfs 0.016 of Runoff Area=26,786 sf Runoff Depth>1.85" Flow Length=330' Tc=1,0.0 min CN=89 Runoff=1.15 cfs 0.095 of O Subcatchment P-4: East area to infiltration trench Runoff Area=15,343 sf Runoff Depth>1.27" 0 Flow Length X180' l"c=6.4 min CN=81 Runoff=0.51 cfs 0.037 of Subcatchment P-5: Central east area to DB2 Runoff Area=9,113 sf Runoff Depth>1.54" ~ Flow Length=176' Tc=6.3 min CN=85 Runoff=0.37 cfs 0.027 of ~ Subcatchment P-6: South Area to DB2 Runoff Area=22,259 sf Runoff Depth>1.15" ~ Flow Length=285' Tc=3.9 min CN=79 Runoff=0.71 cfs 0.049 of 0 Subcatchment P-7: South Central area to DB2 Runoff Area=11,711 sf Runoff Depth>2.20" Flow Length=133' Tc=8.8 min CN=93 Runoff=0.61 cfs 0.049 of 0 (~ Subcatchment P-8: South Central area to DB2 ~ Reach E-CP: Control Point-Stream at PL O. ~ Reach P-CP: Control Point -Stream at PL 0 l~ 0 Pond DB1: Detention Basin #1 ~ Pond' DB2: Detention Basin #2 ,J U ~J -,, u ~~ ~, Runoff Area=25,404 sf Runoff Depth>2.02" Tc=5.0 min CN=91 Runoff=1.37 cfs 0..098 of Inflow=4.66 cfs 0.563 of Outflow=4.66 cfs 0.563 of Inflow=4.62 cfs 0.733 of Outflow=4.62 cfs 0.733 of Peak Elev=93.23' Storage=1,850 cf Inflow=1.15 cfs 0.095 of Outflow=0.40 cfs 0.069 of Peak Elev=90.40' Storage=5,173 cf Inflow=3.69 cfs 0.277 of Outflow=0.77 cfs 0.256 of Total Runoff Area .15.496 ac Runoff Volume -1.342 of Average Runoff Depth -1.04" 88.65% Pervious Area =13.736 ac 11.35% Impervious Area =1.759 ac ~~ ~~ ~. i~ ~-~~ Northern Avenue Housing-Active Type 1!124-hr2-Year Rainfall=2.95" Prepared by The Berkshire Design Group Page 4 HydroCAD~ 8.00 s/n 000752 ©2006 HydroCAD Software Solutions LLC 11 /12/2008 Subcatchment E-1: Existing Conditions Runoff = 4.66 cfs @ 12.36 hrs, Volume= 0.563 af, Depth> 0.87" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type 111 24-hr 2-Year Rainfall=2.95" Area (sf) CN Description 96,180 78 Wetlands 92,521 74 >75% Grass cover, Good, HSG C 5,881 98 Imp. Bldgs, Pavement 142,912 70 Woods, Good, HSG C 337,494 74 Weighted Average 331,613 Pervious Area 5,881 Impervious Area Tc Length Slope .Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.7 60 0.0200 0.15 Sheet Flow, Grass: Short n= 0.150 P2= 3.00" 4.8 280 0.0375 0.97 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 11.6 230 0.0174 0.33 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 23.1 570 Total Subcatchment P-1: West Area Runoff = 3.68 cfs @ 12.30 hrs, Volume= 0.408 af, Depth> 0.98" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 2-Year Rainfall=2.95" Area (sfl CN Description :96,180 78 Wetlands _23;51:4.. 74 >75% Grass cover, Good, HSG C i 3,949 98 Paved. parking & roofs 84,566 70 Woods, Good, HSG C 218,209 76 Weighted Average 204,260 Pervious Area 13,949 Impervious Area n n ~~ r "~ O n n ~~ n O O O n O O O O O 0 O 0 O O O O O O O ~~ ~~ U O O ~~ ~ _~ Northern Avenue Housing-Active Type 11124-hr 2-Year-. Rainfall=2.95" Prepared by The Berkshire Design Group Page 5 HydroCAD~ 8.00 s/n 000752 ©2006 HydroCAD Software Solutions LLC 11 /12/2008 Tc Length Slope Velocity Capacity Description Amin) (feet) (ft/ft) (ft/sec) (cfs)' 8.4 89 0.0250 0.18 Sheet Flow, Grass: Short n= 0.150 P2= 3.00" 1.5 62 0.0200 0.71 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 9.9 200 0.0180 0.34 -~ Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 19.8 351 Total Subcatchment P-2: Central east area Runoff = 0.22 cfs ~ 12.09 hrs, Volume= 0.016 af, Depth> 0.98" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 2-Year Rainfall=2.95" Area (sfl CN Description 7,924 74 >75% Grass cover, Good, HSG C 745 98 Paved parking & roofs 8,669 76 Weighted Average 7,924 Pervious Area 745 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment P-3: Northeast Area Runoff = 1.15 cfs @ 12.14 hrs, Volume= 0.095 af, Depth> 1.85" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type 111 24-hr 2-Year Rainfall=2.95" Area. (sf) CN . Description 11,211 79 50=75% Grass cover, Fair, HSG C 4,511 100 Det Basin 9,302 98 Paved parking & roofs 1,762 70 Woods, Good, HSG C 26,786 89 Weighted Average 12,973 Pervious Area 13,813 Impervious Area O ~ I~ _// \ .._1 Northern Avenue Housing-Active _ Type 111 24-hr 2-Year. Rainfall=2.95" Prepared by The Berkshire Design Group Page 6 HydroCAD~ 8.00 s/n 000752 ©2006 HydroCAD Software Solutions LLC .11/12/2008 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.6 100 0.0300 0.19 Sheet Flow, Grass: Short n= 0.150 P2= 3.00" 1.4 230 0.0330 2.72 Shallow Concentrated Flow, Grassed Waterwav Kv=15.0 fps 10.0 330 Total Subcatchment P-4: East area to infiltration trench Runoff = 0.51 cfs Qa 12.10 hrs, Volume= 0.037 af, Depth> 1.27" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 2-Year Rainfall=2.95" Area (sfl CN Description 3,068 74 >75% Grass cover, Good, HSG C 5,529 98 Paved parking & roofs 6,746 70 Woods, Good, HSG C 15,343 81 Weighted Average 9,814 Pervious Area 5,529 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.8 100 0.0800 0.29 Sheet Flow, Grass: Short n= 0.150 P2= 3.00" 0.2 20 0.0180 2.01 Shallow Concentrated Flow, Grassed Waterway Kv=15.0 fps 0.4 60 0.0167 2.62 Shallow Concentrated Flow, Paved Kv= 20.3 fps 6.4 180 Total Subcatchment P-5: Central east area to DB2 Runoff° = 0.37 cfs @ 12.10 hrs, Volume= 0.027 af, Depth> 1.54" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 2-Year Rainfall=2.95" Area (sf) CN Description 2,758 74 >75% Grass cover, Good, HSG C 4,623 98 Paved parking & roofs. 1,732 70 Woods, Good, HSG C 9,113 85 Weighted Average 4,490 Pervious Area 4,623 Impervious Area (O ,> O Northern Avenue Housing-Active _ Type 111 24-hr 2-Year Rainfall=2.95" O Prepared by The Berkshire Design Group ~ Page 7 n HydroCAD® 8.00 s/n 000752 ©2006 HydroCAD Software Solutions LLC ~ 11/12/2008 O Tc Length Slope Velocity Capacity Description O (min) (feet) (ft/ft) (ft/sec) (cfs) O 5.8 100 0.0800 0.29 Sheet Flow, Grass: Short n= 0.150 P2= 3.00" O 0.1 10 0.0167 1.94 Shallow Concentrated Flow, O Grassed Waterway Kv= 15.0 fps . O 0.4 66 0.0167 2.62 Shallow Concentrated Flow, Paved Kv= 20.3 fps O 6.3 176 Total Subcatchment P-6: South Area to DB2 O Runoff = 0.71 cfs t7a 12.07 hrs, Volume= 0.049 af, Depth> 1.15" O O Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs " Type III 24-hr 2-Year Rainfall=2.95 O O Area (sf) CN Description 10,347 74 >75% Grass cover, Good, HSG C O 5,500 98 Paved parking & roofs . ~~ 1,024 74 >75% Grass cover, Good, HSG C 5,388 70 Woods, Good, HSG C ~ 22,259 79 Weighted Average O 16,759 Pervious. Area O 5,500 Impervious Area '~ Tc Length Slope Velocity Capacity-Description O (min) (feet) (ft/ft) (ft/sec) (cfs) O 0.9 80 0.0330 1.56 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.00" O 1.5 20 0.1000 0.23 Sheet Flow, (~ Grass: Short n= 0.150 P2= 3.00" O 1.5 185 0.0200 2.12 Shallow Concentrated Flow, Grassed Waterway Kv=15.0 fps O 3.9 285 Total Subcatchment P-7: South Central area to DB2 Runoff = 0.61 cfs @ 12.12 hrs; Volume= 0.049 af, Depth> 2.20" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 2-Year Rainfall=2.95" Area (sfl CN Description 2,278 74 >75% Grass cover, Good, HSG C 9,433 98 Paved parking & roofs 11,711 93 Weighted Average 2,278 Pervious Area 9,433 Impervious Area 1/ / Northern Avenue Housing-Active Type 11124-hr 2-Year Rainfall=2.95" Prepared by The Berkshire Design Group Page 8 HydroCAD® 8.00 s/n 000752 ©2006 HydroCAD Software Solutions LLC 11 /12/2008 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.6 100 0.0300 0.19 Sheet Flow, Grass: Short n= 0.150 P2= 3.00" 0.2 33 0.0250 3.21 Shallow Concentrated Flow, Paved Kv= 20.3 fos 8.8 133 Total Subcatchment P-8: South Central area to DB2 Runoff = 1.37 cfs ~ 12.07 hrs, Volume= 0.098 af, Depth> 2.02" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III.24-hr 2-Year Rainfall=2.95" Area (sfl CN Description 8,246 74 >75% Grass cover, Good, HSG C 7,521 98 Paved parking & roofs 8,135 100 Det Basin 1,502 100 Rain Garden 25,404 91 Weighted Average 8,246 Pervious Area 17,158 Impervious Area Tc Length Slope Velocity Capacity Description (min) {feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Reach E-CP: Control Point-Stream at PL Inflow Area = 7.748 ac, Inflow Depth > 0.87" for 2-Year event Inflow = 4.66 cfs @ 12.36 hrs, Volume= 0.563 of Outflow = 4.66 cfs t7a 12,36 hrs, Volume= 0.563 af, Atten= 0%, Lag= 0.0 min Routing~by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Reach P-CP: Control Point -Stream at PL Inflow Area = 7.748 ac, Inflow Depth > 1.13" for 2-Year event Inflow = 4.62 cfs ~ 12.32 hrs, Volume= 0.733 of Outflow = 4.62 cfs ~ 12.32 hrs, Volume= 0.733 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs n r~' ~1 n ~ __- _ . ~:~ Northern Avenue Housing-Active Tpe 11124-hr 2-Year. Rainfall=2.95" ~~ Prepared by The Berkshire Design Group Page 9 (-1 HydroCAD® 8.00 s/n 000752 ©2006 HydroCAD Software Solutions LLC 11/12/2008 ~ Pond DB1: Detention Basin #1 n (~ Inflow Area = 0.615 ac, Inflow Depth > 1.85" for 2-Year event ~--~ Inflow = 1.15 cfs ~ 12.14 hrs, Volume= 0.095 of Outflow = 0.40 cfs ~ 12.50 hrs, Volume= 0.069 af, Atten= 66%, Lag= 21.2 min Primary = 0.40 cfs @ 12.50 hrs, Volume= 0.069.af ~ Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs ~~ Peak Elev= 93.23' ~ 12.50 hrs Surf.Area= 2,100 sf Storage= 1,850 cf Plug-Flow detention time= 172.3 min calculated for 0.068 of (72% of inflow) Center-of-Mass det. time= 83.1 min (900.2 - 817.1 ) ~ Volume Invert Avail.Storage Storage.Description ~-~ #1 92.20' 5,103 cf Custom Stage Data (Prismatic) Listed below (Recalc) ~ Elevation Surf.Area Inc.Store Cum.Store ~ (feet) (sq-ft) (cubic-feet) (cubic-feet) 92.20 1,553 0 0 ~ 92.80 1,824 1,013 1,013 93.00 1,953 378 1,391 ~ 94.00 2,602 2,278 3,668 94.50 3,136 1,435 5,103 rn ~ Device Routing Invert Outlet Devices 0 #1 Primary 94.25' 6.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20- 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 0 2.50 3.00 ~~ Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 O #2 Primary 92.10' 12.0" x 73.0' long Culvert CMP, projecting, no headwall, Ke= 0.900 ~~ Outlet Invert= 91.73' S= 0.0051 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean U #3 Device 2 92.80' 6.0" Vert. Orifice/Grate C= 0.600 O O Primary OutFlow :.Max=0.40 cfs @ 12.50 hrs HW=93.23' (Free Discharge) 1-Broad=Crested' Rectangular Weir. (Controls.0.00 cfs) ~ 2-Culvert . (Passes 0.40 cfs of 2:36 cfs potential flow) ~ L3-Orifice/Grate (Orifice Controls 0.40 cfs ~ 2.22 fps) ~ Pond DB2: Detention Basin #2 O r~ Inflow Area = 2.123 ac, Inflow Depth > 1.57" for 2-Year event ~ Inflow ~ = 3.69 cfs @ 12.09 hrs, Volume= 0.277 of ~- Outflow = 0.77 cfs @ 12.54 hrs, Volume= 0.256 af, Atten= 79%, Lag= 27.2 min ~ Primary = 0.77 cfs @ 12.54 hrs, Volume= 0.256 of v Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs ~,~ Peak Elev= 90.40' ~ 12.54 hrs Surf.Area= 4,437 sf Storage= 5,173 cf ~`~ Plug-Flow detention time=175.8 min calculated for 0.256 of (92% of inflow) `J 'J i / i \ __~ ` J Northern Avenue Housing-Active Type. 11124-hr2-Year Rainfall=2.95" Prepared by The Berkshire Design Group ~ Page 10 HydroCAD® 8.00 s/n 000752 ©2006 HydroCAD Software Solutions LLC 11/12/2008 Center-of-Mass det. time= 137.0 min (958.7 - 821.7 ) Volume Invert Avail.Storage Storage Description #1 89.00' 17,722 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store :(feet) (sq-ft) (cubic-feet) (cubic-feet) 89.00 3,003 0 0 90.00 3,981 3,492 3,492 91.00 5,124 4,553 8,045 :92.00 6,884 6,004 14,049 92.25 7,500 1,798 15,847 .92.50 7,500 1,875 17,722 Device Routing Invert Outlet Devices #1 Primary 88.90' 12.0" x 10.0' long Culvert CPP, square edge headwall, Ke= 0.500 Outlet Invert= 88.75' S= 0.0150 '/' Cc= 0.900 n= 0.012 #2 Device 1 89.00' 3.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 89.95' 7.0" Vert. Orifice/Grate C= 0.600 #4 Primary 92.20' 6.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 Primary OutFlow Max=0.77 cfs ~ 12.54 hrs ~HW=90.40' (Free Discharge) 1=Culvert (Passes 0.77 cfs of 3.78 cfs potential flow) ~2=OrificefGrate (Orifice Controls 0.27 cfs @ 5.43 fps) 3=Orifice/Grate (Orifice Controls 0.50 cfs @ 2.28 fps) .Broad-Crested Rectangular Weir (Controls 0.00 cfs) ~__1 n n CJ C n n ~~ 1 O 0 (~ 0 J U U (~ O 'O U .-, u ~`~ ;, Northern Avenue Housing-Active Type 11124-hr 10-Year Rainfall=4.45" Prepared by The Berkshire Design Group Page 11 HydroCAD® 8.00 s/n 000752 ©2006 HydroCAD Software Solutions LLC 11/12/2008 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method -Pond routing by,Stor-Ind method Subcatchment E-1: Existing Conditions Runoff Area=337,494 sf Runoff Depth>1.92" Flow Length=570' Tc=23.1 .min CN=74 Runoff=10.95 cfs 1.242 of Subcatchment P-1: West Area Runoff Area=218,209 sf Runoff Depth>2.08" Flow Length=351' Tc=19.8 min CN=76 Runoff=8.21 cfs 0.869 of Subcatchment P-2: Central east area Runoff Area=8,669 sf Runoff Depth>2.09" Tc=5.0 min CN=76 Runoff=0.49 cfs 0.035 of Subcatchment P-3: Northeast Area Runoff Area=26,786 sf Runoff Depth>3.24" Flow Length=330' Tc=10.0 min CN=89 Runoff=1.98 cfs 0.166 of Subcatchment P-4: East area to infiltration trench Runoff Area=15,343 sf Runoff Depth>2.50" Flow Length=180' Tc=6.4 min CN=81 Runoff=l.OO cfs 0.073 of Subcatchment P-5: Central east area to DB2 Runoff Area=9,113 sf Runoff Depth>2.86" Flow Length=176' Tc=6.3 min CN=85 Runoff=0:68 cfs 0.050 of Subcatchment P-6: South Area to DB2 Runoff Area=22,259 sf Runoff Depth>2.33" Flow Length=285' Tc=3.9 min CN=79 Runoff=1.47 cfs 0.099 of . Subcatchment P-7: South Central area to DB2 Runoff Area=11,711 sf Runoff Depth>3.65" Flow Length=133' Tc=8.8 min CN=93 Runoff=0.98 cfs 0.082 of Subcatchment P-8: South Central area to DB2 Runoff Area=25,404 sf Runoff Depth>3.45" Tc=5.0 min CN=91 Runoff=2.29 cfs 0.168 of Reach E-CP: Control Point-Stream at PL Inflow=10.95 cfs 1.242 of Outflow=10.95 cfs 1.242 of Reach:P-CP: Control Point-Stream at PL Inflow=10.45 cfs 1.477 of Outflow=10.45 cfs 1.477 of Pond DB1: Detention Basin #1 Peak Elev=93.70' Storage=2,913 cf Inflow=1.98 cfs 0.166 of Outflow=0.76 cfs 0.139 of Pond DB2: Detention Basin #2 ~ Peak Elev=91.19' Storage=9,037 cf Inflow=6.72 cfs 0.507 of Outflow=1.59 cfs 0.469 of Total Runoff Area .15.496 ac Runoff Volume = 2.784 of Average Runoff Depth = 2.16" 88.65% Pervious Area .13.736 ac 11.35% Impervious Area =1.759 ac / ~ l ~_1 ~_/ Northern Avenue Housing-Active Type 11124-hr 10-Year Rainfall=4.45" Prepared by The Berkshire Design Group Page 12 HydroCAD® 8.00 s/n 000752 ©2006 HydroCAD Software. Solutions LLC .11/12/2008 Subcatchment E-1: Existing Conditions Runoff = 10.95 cfs ~ 12.33 hrs, Volume= 1.242 af, Depth> 1.92" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Rainfall=4.45" Area (sf) CN Description 96,180 78 Wetlands 92,521 74 >75% Grass cover, Good, HSG C 5,881 98 Imp. Bldgs, Pavement 142,912 70 Woods, Good, HSG C 337,494 74 Weighted Average 331,613 Pervious Area 5,881 Impervious Area Tc Length Slope Velocity Capacity Description in) (feet) (ft/ft) (ftlsecl (cfs) 6.7 60 0.0200 0.15 Sheet Flow, Grass: Short n= 0.150 P2= 3.00" 4.8 280 0.0375 0.97 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 11.6 230 0.0174 0.33 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fqs 23.1 570 Total Subcatchment P-1: West Area Runoff = 8.21 cfs @ 12.28 hrs, Volume= 0,869 af, Depth> 2.08" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Rainfall=4.45" Area (sfl CN .Description 9.6;180 78 Wetlands 23;514 74 >75% Grass cover, Good, HSG C 13,949 98 Paved parking & roofs 84;566 70 Woods, Good, HSG C 218,209 76 Weighted Average 204,260 Pervious Area 13,949 Impervious Area -\' ~~ ~~ ~-~ ~ _ ~_~ Northern Avenue Housing-Active Type 111-24-hr 10-Year Rainfall=4.45" r-~ Prepared by The Berkshire Design Group Page 13 r_., HydroCAD® 8.00 s/n 000752 ©2006 HydroCAD S oftware Solutions LLC 11 /12/2008 r~ Tc Length Slope Velocity Capacity Description ~-~ (min) (feet) (ft/ft) (ft/sec) (cfs) 8.4 89 0.0250 0.18. Sheet Flow, ~^~ Grass: Short n= 0.150 P2= 3.00" (-) 1.5 62 0.0200 0.71 Shallow Concentrated Flow, n Woodland Kv= 5.0 fps 9:9 200 0.0180 0.34 Shallow Concentrated Flow, (_~ Forest w/Heavy Litter Kv= 2.5 fps ~~ 19.8 351 Total Subcatchment P-2: Central east area ~~ Runoff = 0.49 cfs ~ 12.08 hrs, Volume= 0.035 af, Depth> 2.09" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs O Type III 24-hr 10-Year Rainfall=4.45" ~ ~ Area (sf) CN Description ~-~ 7,924 74 >75% Grass cover, Good, HSG C O 745 98 Paved parking & roofs ~ 8,669 76 Weighted Average 7,924 Pervious Area O 745 Impervious Area O O Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) Q 5.0 --Direct Entry, O rJ Subcatchment P-3: Northeast Area O Runoff = 1.98 cfs @ 12.14 hrs, Volume= 0.166 af, Depth> 3.24" O Runoff.~by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs " Type'111 ~24-hr 10-Year Rainfall=4.45 ^~ ~ Area (sf) CN Description O 11,211 79 50-7b%° Grass cover, Fair, HSG C 4,511 100 Det Basin ~~ 9,302 98 Paved parking & roofs C~ 1,762 70 Woods, Good, HSG C 26,786 89 Weighted Average O 12,973 Pervious Area ~ 13,813 Impervious Area . ~J O L,~ r~~ !: ~ '~~.~ i '~ i a Northern Avenue Housing-Active Type 1!124-hr 10-Year Rainfall=4.45" Prepared by The Berkshire Design Group Page 14 HydroCAD® 8.00 s/n 000752 ©2006 HydroCAD Software Solutions LLC 11/12/2008 Tc Length Slope Velocity Capacity Description min) (feet) (ft/ft) (ft/sec) (cfs) 8.6 100 0.0300 0.19 Sheet Flow, Grass: Short n= 0.150 P2= 3.00" 1.4 230 0.0330 2.72 Shallow Concentrated Flow, Grassed Waterwav Kv= 15.0 fps 10.0 330 Total Subcatchment P-4: East area to infiltration trench Runoff = 1.00 cfs @~ 12.10 hrs, Volume= 0.073 af, Depth> 2.50" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type 111:24-hr 10-Year Rainfall=4.45" Area (sf) CN Description 3,068 74 >75% Grass cover, Good, HSG C 5,529 98 Paved parking & roofs 6,746 70 Woods, Good, HSG C 15,343 81 Weighted Average 9,814 Pervious Area 5,529 Impervious Area Tc Length Slope Velocity Capacity Description in) (feet) (ft/ft) (ft/sec) (cfs) 5.8 100 0.0800 0.29 Sheet Flow, Grass: Short n= 0.150 P2= 3.00" 0.2 20 0.0180 2.01 Shallow Concentrated Flow, Grassed Waterway Kv=15.0 fps 0.4 60 0.0167 2.62 Shallow Concentrated Flow, Paved Kv= 20.3 fos 6.4 180 Total Subcatchment P-5: Central east area to DB2 Runoff = 0.68 cfs @ 12.09 hrs, Volume= 0.050 af, Depth> 2.86" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type Ill 24-hr 10-Year Rainfall=4.45" Area (sf) CN Description 2,758 74 >75% Grass cover, Good, HSG C 4,623 98 Paved parking & roofs 7,732 70 Woods, Good, HSG C 9,113 85 Weighted Average 4,490 Pervious Area 4,623 Impervious Area (~ ( ~ ~~ Northern Avenue Housing-Active Type 11124-hr 10-Year Rainfall=4.45" ~_~ Prepared by The Berkshire Design Group Page 15 HydroCAD® 8.00 s/n 000752 ©2006 HydroCAD Software Solutions LLC 11/12/2008 (~ n (~ ~l~ r~ O n O l__~ O r~ ~~ J l~ J O 0 U ~~ (.~ ~_) ;J O O ,J U ~) .~j '~~ ~:J -~) Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.8 100 0.0800 0.29 Sheet Flow, Grass: Short n= 0.150 P2= 3.00" 0.1 10 0.0167 1.94 Shallow Concentrated Flow, Grassed Waterway Kv=15.0 fps 0.4 66 0.0167 2.62 Shallow Concentrated Flow, Paved Kv= 20.3 fps 6.3 176 Total Subcatchment P-6: South Area to DB2 Runoff = 1.47 cfs @ 12.06 hrs, Volume= 0.099 af, Depth> 2.33" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Rainfall=4.45" Area (sf) CN Description 10,347 74 >75% Grass cover, Good, HSG C 5,500 98 Paved parking & roofs 1,024 74 >75% Grass cover, Good, HSG C 5,388 70 Woods, Good, HSG C 22,259 79 Weighted Average 16,759 Pervious Area 5,500 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.9 80 0.0330 1.56 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.00" 1.5 20 0.1000 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 3.00" 1.5 185 0.0200 2.12 Shallow Concentrated Flow, Grassed Waterwav Kv= 15.0 fps 3.9 285 Total Subcatchrnent P-7: South Central area to DB2 Runoff = 0.98 cfs @ 12.12 hrs, Volume= 0.082 af, Depth> 3.65" Runoff by SCS TR-20 method, UH=SGS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Rainfall=4.45" Area (sf) CN Description 2,278 74 >75% Grass cover, Good, HSG C 9,433 98 Paved parking & roofs 11,711 93 Weighted Average 2,278 Pervious Area 9,433 Impervious Area . i`j / /.. / ~ `~ Northern Avenue Housing-Active Type 11124-hr 10-Year Rainfall=4.45" Prepared by The Berkshire Design Group - Page 1f HydroCAD® 8.00 s/n 000752 ©2006 HydroCAD Software Solutions LLC 1 1 /1 212008 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.6 100 0.0300 0.19 Sheet Flow, Grass: Short n= 0.150 P2= 3.00" 0.2 33 0.0250 3.21 Shallow Concentrated Flow, Paved Kv= 20.3 fqs 8.8 133 Total Subcatchment P-8: South Central area to DB2 Runoff = 2.29 cfs ~ 12.07 hrs, Volume= 0.168 af, Depth> 3.45" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Rainfall=4.45" Area lsf) CN Description 8,246 74 >75% Grass cover, Good, HSG C 7,521 98 Paved parking & roofs 8,135 100 Det Basin 1,502 100 Rain Garden 25,404 91 Weighted Average 8,246 ~ Pervious Area 17,158 Impervious Area Tc Length Slope Velocity Capacity Description (min) {feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Reach E-CP: Control Point-Stream at PL Inflow Area = 7.748 ac, Inflow Depth > 1.92" for 10-Year event Inflow = 10.95 cfs @ 12.33 hrs, Volume= 1.242 of Outflow = 10.95 cfs L7a 12.33 hrs, Volume= 1.242 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Reach P-CP: Control Point -Stream at PL Inflow Area = 7.748 ac, Inflow Depth > 2.29" for 10-Year event Inflow = 10.45 cfs @ 12.29 hrs, Volume= 1.477 of Outflow = 10.45 cfs @ 12.29 hrs, Volume= 1-.477 af, Atten= 0%, Lag= 0.0 min Routing by Stor-lnd+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs _ _ ___ _ __ _.. _ __ ~ ,~ ~^~ ~1 ~-~ - ~- ~~ _ Northern Avenue Housing-Active Type 11124-hr )0-Year Rainfall=4.45" ~--~ Prepared by The Berkshire Design Group Page 17 ' HydroCAD® 8.00 s/n 000752 ©2006 HydroCAD Software Solutions LLC 11/12/2008 Pond DB1: Detention Basin #1 Inflow Area = 0.615 ac, Inflow Depth > 3.24" for 10-Year event r~ Inflow = 1.98 cfs @ 12.14 hrs, Volume= 0.166 of n Outflow = 0.76 cfs @ 12.45 hrs, Volume= 0.139 af, Atten= 62%, Lag= 18.5 min Primary = 0.76 cfs @ 12.45 hrs, Volume= 0.139 of (~ Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 93.70' @ 12.45 hrs Surf.Area= 2,406 sf Storage= 2,913 cf O Plug-Flow detention time= 131.5 min calculated for 0.139 of (83% of inflow) r~ Center-of-Mass det. time= 66.0 min (867.3 - 801.3 ) O Volume Invert Avail.Storage Storage Description O #1 92.20' 5,103 cf Custom Stage Data (Prismatic) Listed below (Recalc) O Elevation Surf.Area Inc.Store Cum.Store O _ __ (feet) (sq-ft) (cubic-feet) (cubic-feet) O 92.20 1,553 0 0 O 92.80 1,824 1,013 1,013 93.00 1,953 378 1,391 ~; 94.00 2,602 2,278 3,668 O 94.50 3,136 1,435 5,103 O Device Routing Invert Outlet Devices O #1 Primary 94.25' 6.0' long x 1.0' breadth Broad-Crested Rectangular Weir ,-~ Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 (~ Coef. (English) 2.69 2:72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 O 3.30 3.31 3.32 #2 Primary 92.10' ~ 12.0" x 73.0' long Culvert CMP, projecting, no headwall, Ke= 0.900 ~~ Outlet Invert= 91.73' S= 0.0051 '/' Cc= 0.900 ~~ n= 0.011 Concrete pipe, straight & clean ~~~ #3 Device 2 92.80' 6.0" Vert. Orifice/Grate C= 0.600 ( _j Primary OutFlow Max=0.76 cfs.@ 12.45 hrs MW=93.70' (Free Discharge) (J 1.Broad-Crested Rectangular Weir : (Controls 0:00 cfs) 2-Culvert (Passes 0.76 cfs of.3.13 cfs potential flow) O t3=Orifice/Grate (Orifice Controls 0.76 cfs @ 3.88 fps) Pond DB2: Detention Basin #2 ~-~ Inflow Area = 2.123 ac, Inflow Depth > 2.86" for 10-Year event (~ Inflow 6.72 cfs @ 12.08 hrs, Volume= 0.507 of O Outflow = 1.59 cfs @ 12.50 hrs, Volume= 0.469 af, Atten= 76%, Lag= 24.8 min Primary = 1.59 cfs @ 12.50 hrs, Volume= 0.469 of O Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 91.19' @ 12.50 hrs Surf.Area= 5,454 sf Storage= 9,037 cf O ,~~ Plug-Flow detention time= 136.1 min calculated for 0.469 of (93% of inflow) ,~ j ~j Northern Avenue Housing-Active Type 11124-hr 10-Year Rainfall=4.45" Prepared by The Berkshire Design Group o Page 18 HydroCAD® 8.00 s/n 000752 ©2006 HydroCAD Software Solutions LLC 11./12/2008 Center-of-Mass det. time= 97.7 min (904.1 - 806.4 ) Volume Invert Avail.Storage Storage Description #1 89.00' 17,722 cf Custom Stage. Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 89.00 3,003 0 0 90.00 3,981 3,492 .3,492 91.00 5,124 4,553 8,045 92.00 6,884 6,004 14,049 92.25 7,500 1,798 15,847 92.50 7,500 1,875 17,722 Device Routing Invert Outlet Devices #1 Primary 88.90' 12.0" x 10.0' long Culvert CPP, square edge headwall, Ke= 0.500 Outlet Invert= 88.75' S= 0.0150'/` Cc= 0.900 n= 0.012 #2 Device 1 89.00' 3.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 89.95' 7.0" Vert. Orifice/Grate C= 0.600 #4 Primary 92.20' 6.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 Primary OutFlow Max=1.59 cfs ~ 12.50 hrs HW=91.19' (Free Discharge) 1.Culvert (Passes 1.59 cfs of 5.06 cfs potential flow) ~2=Orifice/Grate (Orifice Controls 0.34 cfs ~ 6.91 fps) 3_Orifice/Grate (Orifice Controls 1.25 cfs ~ 4.68 fps) .Broad-Crested Rectangular Weir (Controls 0.00 cfs) (~ ~1 (1 -) Northern Avenue Housing-Active Type 11124-hr 100-Year Rainfall=6.50" ~--~ Prepared by The Berkshire Design Group Page 19 HydroCAD~ 8.00 s/n 000752 ©2006 HydroCAD Software Solutions LLC 11/12/2008 r -) ~-~~ Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method -Pond routing by Stor-Ind method ~~ r-~ Subcatchment E-1: Existing Conditions Runoff Area=337,494 sf Runoff Depth>3.59" Flow Length=570' Tc=23.1 min CN=74 Runoff=20.77 cfs 2.320 of n Subcatchment P-1: West Area ~) Subcatchment P-2: Central east area C~ C~ ~ Subcatchment P-3: Northeast Area Runoff Area=218,209 sf Runoff Depth>3.80" Flow Length=351 ` Tc=19.8 min CN=76 Runoff=15.14 cfs 1.587 of Runoff Area=8,669 sf Runoff Depth>3.81" Tc=5.0 min CN=76 Runoff=0.89 cfs 0.063 of Runoff Area=26,786 sf Runoff Depth>5.21" Flow Length=330' Tc=10.0 min CN=89 Runoff=3.11 cfs 0.267 of ~ Subcatchment P-4: East area to infiltration trench Runoff Area=15,343 sf Runoff Depth>4.34" Flow Length=180' Tc=6.4 min CN=81 Runoff=1.72 cfs 0.127 of O Subcatchment P-5: Central east area to DB2 Runoff Area=9,113 sf Runoff Depth>4.77" O Flow Length=176' Tc=6.3 min CN=85 Runoff=1.11 cfs 0.083 of ~ Subcatchment P-6: South Area to DB2 Runoff Area=22,259 sf Runoff Depth>4.13" (~ Flow Length=285' Tc=3.9 min CN=79 Runoff=2.60 cfs 0.176 of ~ Subcatchment P-7: South Central area to DB2 Runoff Area=11,711 sf Runoff Depth>5.67" ~ ~ Flow Length=133' Tc=8.8 min CN=93 Runoff=1.49 cfs 0.127 of Subcatchment P-8: South Central area to DB2 ~ Reach E-CP: Control Point-Stream at PL O Reach P-CP: Control Point -Stream at PL ~~ ~J Pond DB1: Detention Basin #1 (`_~. J ~ Pond DB2: Detention Basin #2 ~~ ,J . J J Runoff Area=25,404 sf Runoff Depth>5.44" Tc=5.0 min CN=91 Runoff=3.52 cfs 0.265 of Inflow=20.77 cfs 2.320 of Outflow=20.77 cfs 2.320 of Inflow=18.20 cfs 2.609 of Outflow=18.20 cfs 2.609 of Peak Elev=94.25' Storage=4,363 cf Inflow=3.11 cfs 0.267 of Outflow=1.04 cfs 0.239 of Peak Elev=92.19' Storage=15,401 cf Inflow=10.99 cfs 0.841 of Outflow=2.21 cfs 0.783 of Total Runoff Area .15.496 ac Runoff Volume .5.015 of Average Runoff Depth .3.88" 88.65% Pervious Area .13.736 ac 11.35% Impervious Area =1.759 ac 1 ' ~ ' ~~ ~ ~ Northern Avenue Housing-Active Type 11124-hr 100-Year Rainfall=6.50" Prepared by The Berkshire Design Group Page 20 HydroCAD® 8.00 s/n 000752 ©2006 HydroCAD Software Solutions LLC 11/12/2008 Subcatchment E-1: Existing Conditions Runoff = 20.77 cfs ~ 12.32 hrs, Volume= 2.320 af, Depth> 3.59" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Rainfall=6.50" Area (sf) CN Description 96,180 78 Wetlands 92,521 74 >75% Grass cover, Good, HSG C 5,881 98 Imp. Bldgs, Pavement 142,912 70 Woods, .Good, HSG C 337,494 74 Weighted Average 331,613 Pervious Area 5,881 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet/ (ft/ft) (ft/sec) (cfs) 6.7 60 0.0200 0.15 Sheet Flow, Grass: Short n= 0.150 P2= 3.00" 4.8 280 0.0375 0.97 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 11.6 230 0.0174 0.33 Shallow Concentrated Flow, Forest wlHeavv Litter Kv= 2.5 fps 23.1 570 Total Subcatchment P-1: West Area Runoff = 15.14 cfs @ 12.27 hrs, Volume= 1.587 af, Depth> 3.80" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Rainfall=6.50" Area:fsf) CN Description 96,180 78 Wetlands 23;514 74 >75% Grass cover, Good, HSG C 13;949 98 .Paved parking & roofs ~" 84,5.66 70 Woods, Good, HSG C _ 218,209 76 Weighted Average 204,260 Pervious Area 13,949 Impervious Area ~l ~~ ~~ ~~ (-1 Northern Avenue Housing-Active _ Type 11124-hr 100-Year Rainfall=6.50" ~~ Prepared by The Berkshire Design Group Page 21 HydroCAD® 8.00 s/n 000752 ©2006 HydroCAD Software Solutions LLC 11 /12/2008 ;~~) n :~ r~~ ~~ n r7 !~~ ~) (~ O ~J r~ ~~ ~J CU ~~ iJ O Tc Length Slope Velocity Capacity Description min) (feet) (ft/ft) (ft/sec) (cfs) 8.4 89 0.0250 0.18 Sheet Flow, Grass: Short n= 0.150 P2= 3.00" 1.5 62 0.0200 0.71 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 9.9 200 0.0180 0.34 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 19.8 351 Total Subcatchment P-2: Central east area Runoff = 0.89 cfs ~ 12.08 hrs, Volume= 0.063 af, Depth> 3.81" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Rainfall=6.50" Area (sf) CN Description 7,924 74 >75% Grass cover, Good, HSG C 745 98 Paved parking & roofs 8,669 76 Weighted Average 7,924 Pervious Area 745 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment P-3: Northeast Area Runoff. = 3.11 cfs ~ 12.14 hrs, Volume= 0.267 af, Depth> 5.21" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III" 24=hr 100-Year Rainfall=6.50" ~_~ Area (sf) CN Description 11;211 79 50-75% Grass cover, Fair, HSG C 4,511 100 Det Basin (__~ 9,302 98 Paved parking & roofs 1,762 70 Woods, Good, HSG C J 26,786 89 Weighted Average U 12,973 Pervious Area rJ 13,813 Impervious Area r~ '~ j u `:~ ~~ l ~ ` J; Northern Avenue Housing-Active Type 11124-hr 100-Year Rainfall=6.50" Prepared by The Berkshire Design Group - Page 22 HydroCAD® 8.00 s/n 000752 ©2006 HydroCAD Software Solutions LLC 11/12/2008 Tc Length Slope Velocity Capacity Description inl (feet) fft/ft) (ft/sec) (cfs) 8.6 100 0.0300 0.19 Sheet Flow, Grass: Short n= 0.150 P2= 3.00" 1.4 230 0.0330 2.72 Shallow Concentrated Flow, Grassed Waterwav Kv=15..0 fps 10.0 330 Total Subcatchment P-4: East area to infiltration trench Runoff 1.72 cfs ~ 12.10 hrs, Volume= 0.127 af, Depth> 4.34" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Rainfall=6.50" Area (sf) CN Description 3,068 74 >75% Grass cover, Good, HSG C 5,529 98 Paved parking & roofs 6,746 70 Woods, Good, HSG C 15,343 81 Weighted Average 9,814 Pervious Area 5,529 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.8 100 0.0800 0.29 Sheet Flow, Grass: Short n= 0.150 P2= 3.00" 0.2 20 0.0180 2.01 Shallow Concentrated-Flow, Grassed Waterway Kv= 15.0 fps 0.4 60 0.0167 2.62 Shallow Concentrated Flow, Paved Kv= 20.3 fps 6.4 180 Total Subcatchment P-5: Central east area to DB2 Runoff 1.11 cfs @ 12.09 hrs; Volume= 0.083 af, Depth> 4.77" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type 11124-hr 100-Year Rainfall=6.50" Area (sf) CN Description 2,758 74 >75% Grass cover, Good, HSG C 4,623 98 Paved parking & roofs 1.;732 70 Woods, Good, HSG C 9,113 85 Weighted Average 4,490 Pervious Area 4,623 Impervious Area _ ~_. r ^~ ~-,, r -~ ~.:-~ Not#hern Avenue Housing-Active Type 11124-hr 100-Year. Rainfall=6.50" -- Prepared by The Berkshire Design Group Page 23 HydroCAD® 8.00 s/n 000752 ©2006 HydroCAD Software Solutions LLC 11/12/2008 ~) Tc Length Slope Velocity Capacity Description r~ (min) (feet) (ft/ft) (ft/sec) (cfs) (~~ 5.8 100 0.0800 0.29 Sheet Flow, Grass: Short n= 0.150 P2= 3.00" ~ 0.1 10 0.0167 1.94 Shallow Concentrated Flow, ~'~~ Grassed Waterway Kv=15.0 fps ~ 0.4 66 0.0167 2.62 Shallow Concentrated Flow, _- Paved Kv= 20.3 fps 6.3 176 Total r~ r-~ Subcatchment P-6: South Area to DB2 ~ Runoff = 2.60 cfs @ 12.06 hrs, Volume= 0.176 af, Depth> 4.13" r-~ Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00=24.00 hrs, dt= 0.05 hrs ~.~ Type III 24-hr 100-Year Rainfall=6.50" (~ Area (sf) CN Description ~ 10,347 74 >75% Grass cover, Good, HSG C 5,500 98 Paved parking & roofs O 1,024 74 >75% Grass cover, Good, HSG C 5,388 70 Woods, Good, HSG C ~ ~ 22,259 79 Weighted Average - 16,759 Pervious Area '~ 5,500 Impervious Area ~~ Tc Length Slope Velocity Capacity Description C~ -(min) (feet) (ft/ft) (ft/sec) (cfs) O 0.9 80 0.0330 1.56 Sheet Flow, r~ Smooth surfaces n= 0.011 P2= 3.00" `-J 1.5 20 0.1000 0.23 Sheet Flow, ~~~ Grass: Short n= 0.150 P2= 3.00" 1.5 185 0.0200 2.12 Shallow Concentrated Flow, Grassed Waterway Kv=15.0 fps J 3.9 285. Total U r~ Subcatchment P-7: South Central area to DB2 C) Runoff = 1:49 cfs ~ 12.12 hrs, Volume= 0.127 af, Depth> 5.67" r~ Runoff by SCS TR-20 method, UH=SCS, Time Span= 0:00-24.00 hrs, dt= 0.05 hrs '~~ ~ Type III 24-hr 100 -Year Rainfall=6.50" v Area (sf) CN . Description ~~ 2,278 74 >75% Grass cover, Good, HSG C 9,433 98 Paved parking & roofs ~~ 11,711 93 Weighted Average ~) 2,278 Pervious Area 9,433 Impervious Area ~~~ I/ / \ ~ ~ / Northern Avenue Housing-Active Type Ili 24-hr 100-Year Rainfall=6.50" Prepared by The Berkshire Design Group Page 24 HydroCAD® 8.00 s/n 000752 ©2006 HydroCAD Software Solutions LLC ~ 1 1 11 2/2008 Tc Length Slope Velocity Capacity Description in) (feet) (ftift) (ft/sec) (cfs) 8.6 100 0.0300 0.19 Sheet Flow, Grass: Short n= 0.150 P2= 3.00" 0.2 33 0.0250 3.21 Shallow Concentrated Flow, Paved Kv= 20.3 fas 8.8 133 Total Subcatchment P-8: South Central area to DB2 Runoff = 3.52 cfs @ 12.07 hrs, Volume= 0.265 af, Depth> 5.44" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Rainfall=6.50" Area (sf) CN Description 8,246 74 >75% Grass cover, Good, HSG C 7,521 98 Paved parking & roofs 8,135 100 Det Basin 1,502 100 Rain Garden 25,404 91 Weighted Average 8,246 Pervious Area 17,158 Impervious Area Tc Length Slope Velocity Capacity Description in) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Reach E-CP: Control Point-Stream at PL Inflow Area = 7.748 ac, Inflow Depth > 3.59" for 100-Year event Inflow = 20.77 cfs ~ 12.32 hrs, Volume= 2.320 of Outflow = 20.77 cfs @ 12.32 hrs, Volume= 2.320 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0:05 hrs Reach P-CP: Control Point -Stream at PL Inflow Area = 7.748 ac, Inflow Depth > 4.04" for 100-Year event Inflow = 18.20 cfs ~ 12.28 hrs, Volume= 2.609 of Outflow = 18.20 cfs ~ 12.28 hrs, Volume= 2.609 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs ~~ Northern Avenue Housing-Active Type 11124-hr 100-Year .Rainfall=6.50" Prepared by The Berkshire Design Group Page 25 HydroCAD® 8.00 s/n 000752 ©2006 HydroCAD Software Solutions LLC 11/12/2008 Pond DB1: Detention Basin #1 Inflow Area = 0.615 ac, Inflow Depth > 5.21" for 100-Year event Inflow = 3.11 cfs @ 12.14 hrs, Volume= 0.267 of Outflow = 1.04 cfs @ 12.49 hrs, Volume= 0.239 af, Atten= 66%, Lag= 21.1 min Primary = 1.04 cfs @ 12.49 hrs, Volume= 0.239 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 94.25' ~ 12.48 hrs Surf.Area= 2,873 sf Storage= 4,363 cf Plug-Flow detention time=112.6 min calculated for 0.239 of (90% of inflow) Center-of-Mass det. time= 63.1 min (851.5 - 788.4 ) ~, Volume Invert Avail.Storage Storage Description #1 92.20' 5,103 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store ____ (feet) (sq-ft) (cubic-feet) (cubic-feet) 92.20 1,553 0 0 92.80 1,824 1,013 1,013 93.00 1,953 378 1,391 94.00 2,602 2,278 3,668 94.50 3,136 1,435 5,103 Device Routing Invert Outlet Devices #1 Primary 94.25' 6.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80- 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 #2 Primary 92.10' 12.0" x 73.0' long Culvert CMP, projecting, no headwall, Ke= 0.900 Outlet Invert= 91.73' S= 0.0051 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean #3 Device 2 .92.80' 6.0" Vert. Orifice/Grate C= 0.600 Primary O.utFlow -Max=1:04 cfs @ 12.49 hrs HW=94.25' (Free Discharge) 1'=Broad-Crested Rectangular Weir (Weir Controls 0.00 cfs @ 0.14 fps) ~2-Culvert.: (Passes 1:04 cfs of 3.84 cfs potential flow) t--3=Orifice/Grate (Orifice Controls 1.04 cfs' @ 5.28 fps) Pond DB2: Detention Basin #2 Inflow Area = 2.123'ac,, Inflow Depth > 4.75" for 100-Year event Inflow ~ = 10.99 cfs ~ 12.08 hrs, Volume= 0.841 of Outflow = 2.21 cfs @ 12.52 hrs, Volume= 0.783 af, Atten= 80%, Lag= 26.6 min Primary = 2.21 cfs @ 12.52 hrs, Volume= 0.783 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 92.19' ~ 12.52 hrs Surf.Area= 7,352 sf Storage= 15,401 cf Plug-Flow detention time= 123.6 min calculated for 0.783 of (93% of inflow) / % ~ y :. ,.,1, Northern Avenue Housing-Active Type 11124-hr 100-Year. Rainfall=6.50" Prepared by The Berkshire Design Group Page 26 HydroCAD® 8.00 s/n 000752 ©2006 HydroCAD Software Solutions LLC 11 /12/2008 Center-of-Mass det. time= 87.4 min (880.9 - 793.5 ) Volume Invert Avail.Storage Storage Description #1 89.00' 17,722 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 89.00 3,003 0 0 90.00 3,981 3,492 3,492 91.00 5,124 4, 553 8, 045 92.00 6,884 6,004 14,049 92.25 7,500 1,798 15,847 92.50 7,500 1,875 17,722 Device Routing Invert Outlet Devices #1 Primary 88.90' 12.0" x 10.0' long Culvert CPP, square edge headwall, Ke= 0.500 Outlet Invert= 88.75' S= 0.0150'/' Cc= 0.900 n= 0.012 #2 Device 1 89.00' 3.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 89.95' 7.0" Vert. Orifice/Grate C= 0.600 #4 Primary 92.20' 6.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 Primary OutFlow Max=2.21 cfs ~a 12.52 hrs HW=92.19' (Free Discharge) 1=Culvert (Passes 2.21 cfs of 6.31 cfs potential flow) ~2=Orifice/Grate (Orifice Controls 0.41 cfs Qa 8.43 fps) 3=Orifice/Grate (Orifice Controls 1.80 cfs @ 6.72 fps) .Broad-Crested Rectangular Weir (Controls 0.00 cfs) ° `~ HYLA~~~-#~g ~~1 Hyla Ecological Services, Inc. - 210 Summer St. -Unit #2, Somerville, MA 02143 Phone: (978) 505-0923 -Fax: (978) 405-5035 www.hyla-ecological.com January, 20, 2009 Adam Cohen 351 Pleasant Street, PMB 222 Northampton, MA 01060 Dear Adam, On your behalf, I have prepared the following brief commentary on the Notice of Intent for construction of the North Street Condominiums development, proposed by Tofino Associates along North Street in Northampton, Massachusetts. I submit these comments to you with the intention that they be distributed to the Northampton Conservation Commission and included in the record of commentary of the Notice of Intent. My comments pertain to the latest revised plans for the project (Berkshire Design Group, Inc., January 16, 2009). I contend that the extensive buffer zone alterations proposed by Tofino Associates to a largely forested buffer zone adjacent to the Bordering Vegetated Wetlands, along Millyard-Brook, will inevitably result in the physical, chemical, and biological alteration of these wetlands. The proponent desires to work very close to the edge of wetlands, with intrusions apparently as close as 12 feet from the wetland edge. Cumulatively, by the proponents reckoning, the construction would directly alter 6,325 ft? of buffer zone between 35 and 10 feet from the wetland edge. The project would result in the destruction of the great .majority of natural vegetation, most of currently mature woods. Furthermore, in an effort to meet the stringent conditions set under.the newly revised Northampton Wetlands Protection Ordinance regarding any proposal to alter buffer zone within 35 feet of a wetland resource area, Tofino Associates proposes to disturb an additional several thousand square feet of buffer zone between 10 and 35 feet from the wetlands in the course of creating tiny "wetland replication" areas. Further, the proponent wants to directly disturb.a significant area of forested bordering vegetated. wetland through an "invasive species removal and native plantings" scheme. These actions are presumably meant to be "extraordinary" mitigation to compensate for the unprecedented buffer zone intrusions that are proposed. I argue here that this logic is ecologically fallacious: the applicant proposes to mitigate the impacts of buffer zone Page 1 of 6 disturbance by disturbing even more area of inner buffer zone and forested wetland itself. This mitigation effort will, in fact, only worsen the impacts to the wetlands bordering Millyard Brook. 1. The Proposed Buffer Zone Alterations Will Inevitably Alter the Adiacent Wetland Resource Areas in Many Ways The Massachusetts Wetland Protection Act seeks to prevent alterations to wetland resource areas within the Commonwealth. In doing so, the regulations use a very stringent definition of the word "alter" (310 CMR 10.04): Alter means to change the condition of any Area Subject to Protection Under M.G.L. c. 131, § 40. Examples of alterations include; but are not limited to, the following: (a) the changing ofpre-existing drainage characteristics, flushing characteristics, salinity distribution, sedimentation patterns, flow patterns . and flood retention areas; (b) the lowering of the water level or water table; (c) the destruction of vegetation; (d) the changing of water temperature, biochemical oxygen demand (BOD), and other physical, biological or chemical characteristics of the receiving water. The idea that the applicant can cut down mature woods torwithin 12 feet of the wetland. edge and have no effect on the physical, chemical, and biological characteristics of wetlands a mere long jump away is completely untenable. There is an abundance of scientific evidence demonstrating that the effects of removing natural vegetation, particularly forest cover, extend far into the remaining woodland from the newly-created edge. The following is a sampling of known "edge effects" that alter.ecological communities much beyond 12-feet from a disturbed area (e.g. an area of construction activities). Altered Physical Conditions: The shade of aclosed-canopy forest produces very different physical conditions at ground level than experienced in adjacent open areas. Open areas are windier and drier at ground level, have sharper temperature fluctuations, and much deeper frost lines than adjacent woods. Rain strikes the ground with greater erosive force in open areas. These differences do not end abruptly at the forest edge but are propagated well into the woods. Light levels near a forest edge return to normal (i.e. similar to forest interior) in only a few meters from the edge (e.g. <20 feet), but wind patterns, turbulence, and reduced humidity typically extend from 0.5 to several times the average height of canopy trees (e.g. »30 feet into the North Street Woods, Richard T.T.. Forman, Land Mosaics, 1995. Pp. 88-89). These altered physical conditions increase the penetration of_invasive plant seeds into'the forest, and stress forest interior adapted native forest floor plants. Page 2 of 6 ~~ -' Increased Tree Mortality Near the New Forest Edge: Changes in wind speed and turbulence near anewly-created forest edge increase the likelihood of tree mortality at some distance from the edge. Wind-throw of trees becomes more common, with effects continuing many yards into the adjacent forest..Quoting from an ecology textbook (R.J. Whittaker and J.M. Fernandez-Palacios. Island Bio_geography, Ecology, Evolution, and Conservation. 2001. P. 208): "We can say, however, that at the edge of anewly-fragmented woodland patch, increased desiccation, wind-damage (to trees), and tree-throw can each be significant... Wind-throw of dominant trees can result in changes in the vegetation structure, and allow recruitment of earlier succesional species (e.g. many invasive weedy species)." (Italics are mine.) In addition, the construction process itself is likely to damage trees near the new forest edge as roots are dug up and the soil around them compacted by machinery. In the proposed Tofino Associates development, the roots of the mature trees are likely to extend 25 feet or more from the trunks of the trees. Trees may thus be readily damaged or killed by construction even though their trunks are yards away. If these damaged trees fall, they propagate changes in the woods (light-levels, humidity, penetration by weedy seeds, etc.) further still into the adjacent wetlands. Increased Concentrations of Salt: Large quantities of salt are applied to roads, drive ways, and stairs and walkways around buildings in Massachusetts (17.6 tons per lane- kilometer of Mass: roadways -this and all references in this section from: N.E. Karraker. "Impacts of road deicing salts, on amphibians and their habitats". Urban Herpetolo~y. 2008. Pp. 211-223.) Salt is extremely soluble in water and is not extracted in any conventional stormwater treatment systems. The result is an"inevitable increase in the salinity in wetlands and water bodies near newly created roadways and houses. Changes in salinity are specifically regarded as an alteration under the Massachusetts Wetlands Protection Act (310. CMR 10.04, see definition above). I have measured the conductivity (an indirect measurement of salinity) of vernal pools and other.wetlands in approximately 60 areas of Westford, Massachusetts and found evidence of severe salt pollution in pools many yards from homes and roadways. Karraker (Ibid) reports studies noting that most salt impacts occur within 70-100 feet of roads. The ecological consequences of increased salinity have received: some degree of study and are summarized in Karraker (Ibid). In areas with significant de-icing salt impacts, plant species diversity has been shown to decrease, the abundance ofnon-native invasives, particularly purple loosestrife (Lytrhum salicaria) and Phragmites (Phragmites australis) has been shown to increase; and the salt negatively impacted aquatic invertebrates and the survival of frog and.salamander eggs. Increased Levels of Other Pollutants: People apply numerous toxic. substances to their lawns, sheds, and home exteriors. Some of these substances are water soluble and readily transported into adjacent wetlands by runoff or via infiltration into groundwater and then groundwater discharge into wetlands at low seasonal water levels. Other Page 3 of 6 ~~-" substances are readily adsorbed onto dust particles. Dust is to be found in abundance around newly disturbed house sites and the dust is blown many yards into nearby woodlands on the altered wind currents near the forest edge. As a result, wetlands located in close proximity to residential areas and with little intervening natural vegetated buffer are prone to elevated levels of contamination, regardless of the effectiveness of stormwater detention systems. Increased Abundance of Invasive Exotic Plant Species: One of the most insidious edge effects that propagate into surrounding.wetlands and woodlands from residential edges is the increased abundance of many invasive exotic species. I have already alluded to how changes in wind patterns, soil disturbance following construction, and the mortality of trees near newly-created forest edges facilitates invasion by exotic plant ,- species. R. Watkins et al. ("Effects of forest roads on understory plants in a managed hardwood landscape". Conservation Biolo~y 17(2): 411-419. 2003.) report findings that: "Exotic species were most prevalent within 15 in (SO feet) of roads, occurring infrequently in the interior forest." Allowing the proponent to build within 15 feet of the edge of the Millyard Brook wetlands will greatly encourage further invasion of this area by exotic plant species. Population Decreases in Wetland-Dependent Wildlife: Although a wetland as defined by law may end abruptly at a delineated boundary, this is not the case for the extent ofwetland-wildlife habitat. Many wetland-dependent species depend directly on surrounding upland habitats for their life cycles. Their populations may thus be destroyed by work in buffer zones and adjacent uplands even if the adjacent wetland is left intact. Windmiller et al., for example, documented the extirpation of a wood frog (Rana sylvatica) population and the decline of populations of three species of vernal pool-dependent amphibians after adjacent uplands were cleared for residential construction ("Breeding amphibian population declines following loss of upland forest habitat around vernal pools in Massachusetts." Urban Herpetolo~y 41-52.2008.). Such effects can extend far beyond the edge of the delineated. wetlands. 2. Allowing the Alteration of Additional Buffer Zone and Wetland Resource Areas Will Worsen the Effects of the Development -Not Improve the Wetland Resource Area . The Northampton Wetlands Protection Ordinance requires a strict condition of projects seeking to encroach closer than 50-foot from a wetland edge, permitting such encroachment only "where development includes mitigation that will improve the existing condition of the wetlands or adjacent upland area...". In permitted zoning districts, further encroachment closer than 35 feet from the wetland edge requires "extraordinary mitigation, replication, restoration, or open space preservation measures". Page 4 of 6 ~\ In an effort to meet these strict standards, Tofino Associates proposes creating several small "wetland replication areas" and additionally removing "invasive species" and planting native ones in a ca. 3,800 ft.2 area that intrudes into the wetland itself. This additional removal of forested buffer zone will only worsen the impacts upon the adjacent wetlands in all the ways described above. Even more trees will be removed and the cleared edge will be placed either at the very wetland edge or, indeed well into the wetland interior. Thus, further alterations of the chemical, physical, and biological characteristics of the Millyard Brook wetlands will occur deep into the wetlands themselves. Furthermore, the small, very narrow "wetland replication" areas will be of extremely dubious ecological value. They will do little or no good, other than allowing the proponent to claim that he has increased the area of wetlands. The tiny replication areas will be entirely "edge" habitat in an ecological sense, and certainly subject to intense colonization by exotic species. Wetland replication areas are notorious for failing to replicate existing wetland functions in any meaningful way. As Stephen Meyer, former M.I.T. professor and chair of the Sudbury, MA Conservation Gominission wrote: "A recent study suggests that fewer than half of all constructed wetlands actually function as wetlands, and that few. if any attain the full functionality of the original natural wetland (NAS, 2001)." (S. Meyer. and D. Konisky. "Community-based environmental protection: A status report and some new evidence". 2005. See: htttp://web.mit.edu/polisci/research/meyer/Outcomes AprilOS.pdf) The chances for ecological failure of very small replication areas (<2,000 ft.2) are particularly high given the nature of ecological edge effects. Finally, the intended removal of Norway spruce (Picea abies), anon-native species occurring in a dense mature stand in the Millyard Brook wetlands can, in nb way be construed as an improvement. Although these trees are not native, they provide complex habitat structure for wildlife, help birid the soil that enhances the erosion control and pollution attenuation functions. of the wetlands, and moderate climate and humidity levels in the wetlands. The removal of these trees will cause major direct impacts to the wetlands and adjacent buffer zone and will greatly facilitate the establishment of truly invasive exotic species: The tree removal will also greatly reduce and simplify existing wildlife habitat. The resident birds, mammals, and invertebrates care not one whit that these mature trees-are originally native to Europe; they exist and provide excellent habitat structure.. The intended use of.herbicides by the applicant to control Japanese knotweed (Polygonum cuspidatum) will moreover result in the pollution of the wetland with herbicides and their toxic surfactant agents. The commonly used herbicide glyphosate (Rodeo and Roundup) has been shown to be highly toxic to Page 5 of 6 \_~' amphibians, for example, in numerous papers by Rick Relyea and colleagues (see ' summary at: http://www.medicalnewstoday.com/articles/221.59.php). Japanese knotweed and multiflora rose (Rosa rraultaflora) are furthermore difficult to eradicate, even with herbicides. To do so will require significant doses of herbicide applied many times. In the end, such schemes are likely only to result in further degradation of the wetland system. How long will the applicant continue to remove exotic species and replace dead.shrubs and trees that are planted in the mitigation areas? Three years? Five? Ten? A single generation for native forest trees lasts decades. In such a time scale, any such heroic efforts will certainly have been abandoned and the seed bank of invasive species in the soil will still be healthy. The 1Vlillyard Brook wetland will have been reduced and degraded physically, chemically, 'and biologically by the construction of the proposed development. Deed restrictions and the exact location of no-build boundaries will have been long forgotten and yard waste, trash, and additional clearings will .have extended into the wetlarids and beyond the edge of the nearby lawns. This effect will be exacerbated by the minimal outdoor space provided for residential development of such high density. . Sadly, the citizens of Northampton will have lost a large chunk of increasingly rare urban greenspace in the name of "Smart Growth". I hope that these comments prove useful. I can assist you, if needed, in gathering additional reference sources to support the arguments made here. Sincerely, Bryan Windmiller, Ph.D. Wildlife and Wetland Ecologist Page 6 of 6 \ ~,I ~1 ~y..~ The project consists of 25 townhouse units on 5.6 acres of land, which includes 2.2 acres of wetlands. No work is proposed in the wetlands themselves. As part of the sustainability plan, which is now approved, the city wants to focus additional development in those sections of town that are already densely inhabited, including URB, the zoning district of this project. The name typically used for these kinds of developments is infill, and there are a lot of benefits to infill development, such as e Reducing the need for new development in outlying, more rural areas, conserving farmland and wildlife habitat e Providing more housing near places of employment • Reducing the time, money, energy, and air pollution associated with commuting and the use of single occupant automobiles e Increasing the viability of public transit by increasing the number of potential passengers • Increase the liveliness of downtown and the economic viability of the businesses within walkable distances To mitigate for the impacts within the buffer zone, we will clean up and use intensive plantings up to the no encroachment zone. One of the most important functions of the buffer zone in urban settings is its potential to provide wildlife habitat. However, it is currently quite degraded with trash and invasive plant species, which diminishes its wildlife habitat value. We propose to use native woody and herbaceous plantings between the yards and the wetlands for the dual purpose of providing for wildlife,. and keeping people out of the wetlands. We will plant native fruiting shrubs, such as high bush blueberry, winterberry, and cranberry bush viburnum, to provide high quality forage for a variety of animals. We will also include a variety of shrubs that have thorns or form thickets, to stop the spread of any yards towards the wetlands. We also plan a system of clear boundary markers labeled .with the phrase "Limit of Yard" so all owners are informed about the restriction on encroachment on an ongoing basis. .-•~ .~ ~ __ - 1. , r~ ~.• / / /~6 ~ I 1'!II / '~ I ('/; o~ ~ _ (\ . ~ 1) .' •" .,, s ~ ~ ~~? \ \ _... ~ r'~ 1111; ?~ ~o i I I 1\ ~' -- •• _ ~, •.~ ~ / • ~r-..,.. ... ~ 1 \\ J / F' 1 Ee. I t ,^`°"~°, -'. .. 's tea ~. -~ ° ~ ro I ~ .I• .. I n~M.nM"'' 1 .. ,.. 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C (p I -~ i a ~ ~ < " i~~ ~ n v, a .. ;, ~ ~~ ~ ~ ~~ i ~~.: - $ x N .. w ...... k `' f Hand L elivery ,,..;...: ; Nnrthaattl:rto.n Consezvataan t~:oanzni,ssion .. :..:; , ~ , . . City cal~~o~rtlaana~ptz7n 21.0 ]rlain Street, C'iC,y~ 11x11 Northampton, a1~9F1 01OCi0 lie: Nance of Intent Application [t..t:c~ r-•it~~ t~: Izc°t;o~-:~tio.t) t ~ DEP File #246-17625 North Street Condominiums Norkh Street and Northern Avenue Narthamptan, Massachusetts I.)eaa- C;omanissioners: t:)n behalf of tlae 111:alalicants, Nt:arthern Avenue 1-[games, Inc, a~aic~'1'olttao t1;soeiatc:s, laze, I..,l';C F;nvironmc>a~tal Consiafta.nts< Inc., (I,I:C) lags prepared this let.tez~ tca su1>Ialetaac;itc the Ncatici: oFlnt~nt. {N{:)I} :1i~plication t>z~i~~irzallJ~ . subrrutt:ed Ora Ntavembec l~, 21108. As ori~ixttzlly proposcij tli~:~l7itifdcf irzvcalved th.e coustrtrotion ot•tweuty ti,ti+e (25) t0avnhouse conc:laratirziun-z zanies rvit:h ass0ciate<.l al~priitc.n~rat;~s,' including; a raaclrvay .>ystez'rz, ptarlcinL, drivc,w<a.ys, utilities, storanrvaler naanagemeut areris, rand landtictijaaza~ Features an a S.~:a- acrc prgjcct site. I'ortion.s of the pz•0jeci aec;ttaxed urit:tz.irt tlae 1Q0-I'c>ot Bttt'{ca Zori:e'lci ~7iz-sage I:)Or'glc'1-zrar; Vc~eta.ted `~'c:tlands (tiV~t1"} ~tnd an Isolated Vtr~etaie.d ti~%etlaatd (1VVr') ~arate;t;tc.d tanner the iL~trss•uc:hc~snt~s l~t't~tiarads~.,(a'rotcsctiora ,~lt,•l {M.C,.T..., c. l 31, s. X10), its impl.en7entrz~ Regxtlulir.>rrs (3 "I c) {:'ArII2 '10.00); anchor the C.'.ity of N<>rthanaptc~:n l~ est~urr~s F,°crteeaiorr C?r-rlirzrntf°c~, C'hapCet• 3:>' {C?a clii;arzcr~.?, Slaccifically, tlae Iaroposed L.inrit caf ~4'~'csrlc, cosnl?ri5ed i3f`c-rztrenehcatl. sift {cncin~, u~as situated ula~n•adie:nr 01` tbe; 13tir~U b0tntda~ry, 10 E'cet' at its closest laoint (ser~e:ra locations}. Sincc; the ori~tinttl li.l.ing„ the sagape 0:f the, prg>jeei kris bet;aa tii~atiii:rt,tuttl.y z'c.duced in size, na.<.asr. notably 1:o inc:r~rts4 wetltzzzd .liaaf•1e:a-%0ne setbaclg , elirninate trr't> ua7its, eliraai.rai~tt. a cletcnii:an b~zsiat, reduce; the; size 0f il:re 1:>a:izxa~zry deCe:atti.can 1>asiaz; colati:rruc; ica inc;carl:aarate .i...osr~ Inil7tzct I)c~ c 1cal~iu'ciit '(1..,.11.)) dcsi~rt cc~zzcepis, aizrl redut;e t1tE aria>tztzt ol'ira>peavi0us surFaces r~ritltiaa the 1t)t)-1'001 Buller /ori4. I~urtlteraa~ore, proposed ntiti;;anon measures (i:nvasivi specie:5 txnatrol pro<rraatr <aaxcl z~c;placenzent of'e;xistii~L, Tarr rz arc;as rvifila native vegetation) liar-e beear sigzail'icantly au~rnc:ntcd to In•ovide a lcarzt;'••tc.ran raet btneiat to,the t~Vetlaad l:esotrrae (t.reas attgl assoc;iatccl l.~ui'Fer ~0_rae. 1'rt7je:et det4iils are depie~ted oat pl.azts ezatitlcd ".Nc~r•th S'rrt,}t~t C~rzcrrarnhaiwaras•." prep~za~ed la1' Tl'te 13crhslaire 1:7esirza C3roup, laac., dated Maa•clt S, 20(19 (,S'itt> l'larrs). `I'.Ite. fg>Ik7~riaa±7 pr0vi<lc•s a rlt;,>criptitnt al`tlac existin~~ si(e e,nufi('i't7n~; 1)rc~jeci deirtil,, azad anitigatin<~ rracasttres 1:rrt>pose~;d to protect and eatharrce the intca•eses angl vralucr~>[ ti~ka~sit~relatc~cl Wetlaatd.ll.esotu•cc :Areas cnunac:rated rr•itlaiu the alaave-rel:creatt;e<l stattute5. I,ta;C, lists 17aepared!Uats a`~piari l•}asecl t:n'a rt;vit~rr- a1'rnaterials stiE7anitted to t.lae. Conservtation C::OZmnzissi0n and a tot~ll ca~t'atizaeteen (19} si~'te:vis~its~ctati~rze haclr. t0 ~ugtast 23, 2007, iazclud'iug a c0rnprehensive \iernal 1'001 !rssessnaerat coxtdrzcted fz•0an ~1ai-c.la 18,'Lt108 tla.roug~la May 28, 20U&. i.c~« ~"~tvis~.tea°€~;s;s>ai~~a~r-~~tt~{~~~,~ inc. _.~~_<°.~,1;^r~> 3 ~r:3~arf,~*rat<t ~~or~~. ... .. Cxistir~g Site Cotlditiatis "I"he 5.(:rn acre p.rojc.ct. sit:c, cornpri.sed o{'t~vc.~ subject pai•cc`Is es located wi[laa:t~. a r:rxoclerately to l~eavily- dcveloped residential area of`Noriharn{Mori., MassaGlztrsetts. 'lrr genc;rttl, single••i~tntily and rrrulti-{an~tily clurellirrgs exist to Elie nortFt, east, south, arid. west of I:lre l7i~oject site. ~n existir.~g paved bike path located on a for•Ea1er (eleva.tcd) railroad lied occars directly north o1'tlac l~r~operty+. l~dditiortal.ly, c;o»7at7erc:ialiiridus{rittl Cievclopment is located. fiu-fher taortlr of the sulaject ]~arcc;ls. ".t.'lre sire affords fi•ontare al.or~g Nartl~err•t Avenue; (pablit;) to the trotKheast ata.d North Street Co Che sottthcast~>ia Vie7~r Averruc (pri~v~ttc:)1u~d a 40=t`t~ot l~i~~hi'-o{= V,ray (R01?,r). ltntaleci.iatcly adjacent to North. Sta•eet, the 4Q' w`ide .R.C.}1?4r coaatait>s a ~~ravel sur•1.'ace aatc:l titrteticrns as ar c:orrErrturt drive~a ay {bt• dwellings ro thL t~oztb_ ttnd south. Cur1•ently, an e;xisti.ng single-fanl:i.ly d~~-elling occurs on-site at #ltc; ter-tr~irnts r~l'1~'ie~~~ A~,~e;nttc, ~lsc> utilised as ~.~ shz~red cotnnron dr•is~e;~~,:i};. ~t"lrir ciwe]IiuL; is itaanaecliately srnxaunceecl lay rrtanicured la~x-n ccrr~ditions, ornamental shrubs, anti garden areas. 1i;.emainltzg utadevcltxl)ed. por•tion.s a1`tlac site a.rc cortalat`st;d c~1'i.'orested ~xrcd:l.an.cl (1.31/W), a.n lGrttr.:ti~restece ulalanrl, anc] successional rozrclitirins presetai tv:ifhi.tr }irevi.ously cli,sturbed. 4u~eas (e.g., tlxe IZC)W). l~o~~c~sled U~~land f=at•cste:d up.la.nd canditians occur within the nortltctlt, c~tili~al,:ard'souti7/southeastern portions of the: projtiet site, abutting the a{l7rCn]t;rillOned 1'3V~~r iln.d 1VW. •1`Jle',noCt:he=t7't l)Ortlon 011:}1e; ~`01'e51:E:d lll:)lil:llt] is dotninated by a n~tode:rai:ely cicnse. deciduous can.ol~y corrsi ti:ng o]'vtu•iirtts otikt> (Orrcrrcus spp.), ~1:n~.erican ehrt {titnrtr,cr am.ericurarr), and red tnaplc {flc•t°r r ut~rruri). "l'he slartrb ]aycr cbntrtins an•otvwoad {Vihrrrnrr rx r~ieralratcraaa.), ntultilk7ra rose (IZrzstr rrrtcttij'rrrzr), glassy buckthorn (li'Ircrriirrris•;ti°urx~;~tatcr),.laotrcysucklc, (.1 rrrricer~u~ stala.l, aapancse ~laarberr-y (:13er-trz>,ris tlrtzrrber•tii), attd burning bosh. (lauorx~~rrrars a/,utrrs). Grx7uradcover is benerally eorrlprised of szedlins~s .front t:l1e canopy and sl~:r-ui7 laye;r, ire adclitian to poison ivy (l'aticoctcrrrrtrcrrr r~urlir;csrrs). lt~ cnnta~ast, Ehe southern portion of'prc7ject site; is don7itiatec3_b~; a dense Not-tvcay spruce: (Pic•cuz rrbies) stance. As a result of the dense canopy, the shrub layer i.s genea•al.ly absent: i:o sparse. 1'oisc~.v. ivy, iraterrupt:ed 1'crn (t )srnun~la rtrrt-tarxirzrrrz), ar~d cinnrxa~ton .fern {C)satxurrc~a c;inniirxrrrnaen) occupy the groundcovc;r. - lrt ~zencral, an-site Copergrahrhy sulafly descends cotx~rrrds the wetland bounclc>nries. 1-(owever, in~rnedia.tely upgradient. o.{`wetland {Jar7 ~''s i-ti, :31-i~, a_32-a3, and <t;~-<t~~t, iopo~araph~r is dc.~ne.d by clisiinct brnakt; its slolae, evidence o{`historic Itllirtg. :Sru~crssiuauct C.:'urrrliticrrr_s Prey-iausly clisturbcd 5trc~easie,aal eouditrc:>rts orcar ct.ithu~ t11~;'~t'fcn•niet7tiorre:cl ~U" wide;12.t:)VJ, ru•cas surraurulnt;~ t.Ptca existing single-family d~vellitt~;, anc:] arc~ts iibtilt.itis}, t~!orfherr~ ;1ver~ue, <'urrer~tly, irtcividua] ~ixne:rican elna, Nrtrwa.y utal.~le (r9.r;crrlrlatararricte.~~), blacl, cl~errj+ (l'r~urarr,s sc~rcrtiizcr), artd black lcrcttst (IZobirrirr p.rezrtlrracur°irr) trc;cs are; sea[tere;cl. tlarout,houi i:l~c; ~lU' u-icle: Ct(1)~t% trt7d arc; nrost:ly ortcasccf. icy (crx ~;3•a.ptw (f~iti.s tcrlrr°rrscrz) and Asiatic 17itterswcet {C.;'c>tusn~rrs nrbiccrlrrltr) eaats:nl;lettte:rats. W.ralti.tt. at7cl ittatnetliftte].y sttrrout.tceittg the; ROW; the ~>htltb layer is catn.pris~d o1'scatte;a'ed. licra7eyst.rck.lc, naultitJor<t :rose, aaad stagh.ot:rt. sumac {l~.lrrr,s rt,taltirrrz) clustors, wlxile various goldenrods (Srzlirlca.tTcr slip.) gccur within the. t,rout7cicttver. ]rtclivicluals and patches of Japa.uese latotweed (;Pczly~;cznrzrrr c~r.rs~ziclntcnrr qr.f'ctltrrfJicr-jcrhrzrric:u.}, ccrn.motl biaclcberry (Ilr.rbus crttc~s,lac~nii~rtsis), yely { 7avrrs slrp.); multi{lt~ra rose; and dci~;wood (Crzrrarrs spp.) irnrrtecliately : but 1av~~n corueitions associated Gvita~ tht: c;xistintY sins;le•'~ftunily d~~c~ellirt~~. 2 «f 8 CSt#'Fag,Jdutr'C' rst..l'Cv9i:~UTi~t ~,rfi:t~mF'Eei~.ti .' Y1ri7i'r~E'a`TE#§ t:fP~C7GF. "dt'i (_~ ~ 1 .. ~. { ~` _ _ . ifi%ellartcl ~f r•crrr,s l"ru~('ste~l i~!'eflcnrd (ff 1/1'1~J "C"he ncarthern axxi northwestern p<)rCioras c)t the largjcca site tart- i)(,c.Lt(?ic:cl by s} Pt)r(wtitctl vt'E~tlanri sti'~;tc177 characl:erizeci as a 13VVt~'. "l"la(a F3V~'v banndury caepieteci, ora file S"ice 1'lccn.s hcls l7eeta e.c>nfcl•Illecl as aecLtl•tlte tht'<)ttgla a l)ete;rl'uinatiora of'.h1.p.lalicability (IC7r~} issued by the North.an7pton C:`oaxservati.an C:'()nlnxiSSiC)II ()rt :~:U~LlSt 24, 20C!?. "l."h.e R'CC1atIC1 S)'Slelxa bUrC1F:i'S Qtl a ItI1CCir Stx'eaaxx (C1rtCla}, 1'efe17'C:Ci tC) aS 11'(:llayard l3t'C)Ok. I'aal~itlally pl'()~C;C:titl» OlltCl file pl'C)IeCt Sate, lal)L'/E'VE;'t' b?C)xCl'Fllly f'oI"I77111f.; t11E~ S'ItC'S llOrtl'}1kC5t1.1'fa 171'()p~rt}' boLUlclal-y. `l"he .DC}A also reaftirmecl the stream as intc:rll7ittenf. `l"lle ditcl't e:~tends tuuletncaih the of'(=site bike J)atll viii arl c:)lta stone bay culvert alld eventually co:naects 4vitia tlx s_ite's tLCalalr\cesterrl latol)eI-t:y bnalxdairy; c~tel'tdirt~; \~'iChirt a ~L-7 foot tivicie cllatl71e1. 13tulk heiglxts geilcrally range fi•olra l-~ ['cet, with d7c dit:ch's strbstt•atc cot7:lprised ot'tltueky ot•L?anie sc)ils. l.~aseci ot) the lialear r)atua~e of the stre<lttl, the clitcll appears tr)11.ave bec.tl excavated it}. the past, prc;sunlal7.ly for drainage purposes. I}urinb the sln'ing laydraperiocl and :(bllo'~\~it1g f>i(:cipitatit)l7 (;vents, the Stream. f1o\vs i.n <i ;~outll\vcstel'ly (litc,oi.i.(:)n, befar~ 1.)ecoln.illg slat=n.ltlt alad (:Iryiltsr out. 11C'.~1n7]111l;'l)1 littc Spl']Ct~; {I7CC)tlgh the SUC17.1ne:T' 7nC)17t:hS. L3aSed C)17 Cl;ll'eCt Ol>st:1'Va.C1017S anci OthC:1' 7nd'LCf1t01'S of stainhtg, s'lu°faC:e waters internlittela.fly overtop t:be ditch's baltlcs aC several clistilaet locations. Due tc) a ~;entiy SIC)1)all~ tOpo€;1'al:).lalC ht'iIdIL17t ~VCtlllll the I'3VW SyS{e171, SUI"1'aCC wiit'el'S ~h;Ilet'F.tlly dratl7 {O~YaI'd talc'. Ca1l;Cl1 (tolao~n`atallic la~\' paint} du:rtitx;, t11e: sl)t'inL; hyclraperiocl as a'restllt ol'hiyh groundwater a1ac1 spring rllnO'L{fsnow lncli, in additiotl to iollo~lring laer-iods o{'heavy l):rccip'hatioal. F~'uI'tl:lel•tnare, sul)tle, small depl•essions C)cCLt}s. thri)'ugllattt the. 1~VW systcru, praxirttate to file ditch. '1'Ixe: forested \vetlaricl is cloaxiinafed by a lnoclerately dense, cailol~y of reci anap?c anal r'1.In.ericall elrn. wi.t:lt sc:atic,re(i individa.al aak aalcl E:iist.ea-ta c+'I'tite pine (1'irrt.5'.,~~rohzrs) trees. '1'hc; scarab layer is conxhrised o'f 81`t'<`r\4%\\'C)C)Cl, hOn-f'.yi,1.1C1Sat;, ~?'105Sy 1:7 LLCkt11t,)'CI1, lnallaf~l(.)1'il IUSC,..1<l:(.)i1I1.CSL' 1)ill'17ea"['}', "\~`ttl:tGrbGrt`V (Ctt'.1' 1'('1'CIC'ltfir'!r}. si7eckhd alder {.'{lx~c~s iric:crr2a ssp. rtr,~~(su}, spicebash (J~~nclc~;•~r /)c'srt~tlirr), d.t)gwood,l)i;,atbLtsi)~blLlcbell•y: t-%rz:c°irlitnn u°tlrl-rnr~{~,curn); Arad n)apic.l.eai vibua-ta.titm { t'~t}trr-r;trtt uc'csrij ~tzrtrar). 1'oisol7 iVy, a.ilxnillnon {ertl, itxic:rraptc:d 't'ern, setlsitiv'e feel (Cltrr~cfecr se~LSi1)itis), jcvcclt~ced (fnr~~rrtaerrs ca}xrr.rrs}, anal seedlings firorn the L:atloZ)}' alai shrla.b layer c)cctlpy pot•ti<n1s ot't.lae groutlcfc(~\rct... Is()lirzctc7 l'c%~;c}tate°d G'carlurrd !1 srraall .Isolated V~gc;tatc:d lVetlartcl (CVbV) exists wiclttu tl?e nortltcastcrn partic)rt erP the, projcL:t site,. 'I"he i)C:)A also cotx:f.'iraxL;cl t11c l'Vt~ lxnirtda't-)1 as acctu•ate. Ve€;etat:i~~e eonlpris?ainn and species diversity tL~'itaai.rl rate. CV11' are genet•ally cC)aGistelli rv~ifh tlae: 131r~~%,17awe:rer, hexllloi It (!'sr.r~;cr rcrrrcrrirynsis?wri ob5c:rvL*d within tl1.c 1V4~%. F.~ased on dil'ect ol)scrvations, the i.:nt.erior crf d1c> I lJbt` holds Ltp io eleveta t l 1) hlcihes of stanCl'ing water fo1° a sh(>ri~~ned per~ic)d of tinlc i17 eaxly sprilxg. i!c~r'rrcri .l'nol riss~'ssmerrr ?1.5 1)I'l.l'CC)1.IS.1'S' slcti:ed ia.l'lCi "fpllOl'/1.11L; tll.e C..(7tli.tnlSSlolt'S Flpl)C'(:)\'i31. 1....1:?.C.. Colt.dtCC{eCl 'cl Co[xll)1'el'LE:Il.S1VC Vc::Caal I~o01 r~sscssn'ient in spring'?Qf)S, tc> evalurrte tile:. anult.il)lc snxall, subtle depressions scirtte:rc:d.throLtghoatthe intel•iar U9't17C I'~~r~'41 atxd l~r~t. In :ianlnlal'y, nC)nEt cYf thL: f"iV(= duel"('CSit)I'Ifi STCICl1C:d Ttll;t tl'LE' Ca'tte.rlfl tot' Certli'IC:~lf1C)n il5 Vernal fool htib?.tat as desct•ibeCi witlaut Clue Cjtric~elinc~s•for [l7~ C ~r•ir/icrrtrota. of J~(rr-;acrt !'vot llcrhrtrrt, prc;pare~i by Che Masa(llusetts .Division crt fisheries arld ~~'ilcilife (daLe~i. Jilnttitry 1, ?00 ()anti. lvt:re not ec)nsidered to be 1'resalrted Ve;l•111:1? fools or ~jerrtal 1'001 1Zesoui~ce .lrcas as ciefinc.cl Lrnc?er Che <7rdirranca. . .. ' , cif S (:,~"if-ct3iL'E@~i" {^t:YM1~tC7iJTH ~;~+~`sts'~i'i?1.t: 1~C}e~iC^o7'}~id Fi}NRf,Y«, t~t# ~~ e r _..._ _g. 1\I[) 0l)11.gaC~ ~+erltal ])C701 Sl)C:C'Ie5 1Ye1'e C:nCC)Ct11tC1'ed 1171'C)L1.g17t)llt tllc Cltll'atl()1'1 ()'1'tl7e: 1).SSGSSl'a1f',Clt. NO S1~I1.S a{ iltly amphibians, ()bllgatc r)r facultative, \V81'l'. (lt)L'lltTlent[:Cl (J11-SII:C:, 111Sk:.lyr1 p1'0(.1tlCt 0'1 t17e St117'O11nC1111g 17abltult. hlntlsca~pe, Additionally, if. is L117.likt)ly t11at watcrlcvels 1lresent within eac}t tlc})ressiozl u~ocll[i suppal°t 5llGC.B;SSfCCI a1.71'pla.al)tail l.ar-Val de\/trla~ralL'llt. Wlltle faCUlfattvt'. Sl')OC'iC5 ~Vt32'E elleOLllitBl'GCI. 1)1'lnlat'71y ~ilgel'na11 clala7s (farllily: Sphacriitlae, also k.n(.1~~~n as 1'isidiidac) andlor air-breathing snails {~ftln7ilies: 1...ylnnaeidae, Physidt~e, a:nca P1anorl)i[lac); four t)ut of the live stu[ly areas did not calltaira surface: watea~s fob- Fi{) tx.)zlsecutiv[; days durin5z file spring gratvirag s~asan. '1'11c fifth study area laws conrigut)us w'iill Millyarci. Ciroa)k and rt.ulincycl water li)r ~~a•etuer than G{) d;>ys as an itrt7xrx aP~vatea• fraril ail itlterrali.ttetle stream atlcl therefore was nat i:otlsidca'ec[ to be Vcr11r~1 Ptx)'111abit<1t. r~s requi.a•ed cruder tht; QrGPirrtrnc~e; rainfall cturin~~'the rlssessl7tent ~tvas dacLanlent:ed to be at least 7;S';'~ of the overage over the. last '1.0 years ir7 Nart.llarnpton. AI] eza.coutltered facilitative il7vertebrate species are coillrnnnly fonn[l uTitll'ial fol•estcc3 wcaland systents coalta.inialg partially Sten'adl.tag watl'.1' CatLtJ.11CC1 to Slllall SCcltterC:d Cltl)1'e:SS10115 ~Lndlor stream beck. 13at11 :tirtgertlal c.larals and air- breatlaing s1.~ails are able> tt) su17-i:ve dry' pet°iads 1)y burcowila~ into t1a.e n7uck.y argani.c soils and. leaf' litter present tvitllin all live an-site Study Areas. C)z1 Jlnic ^~, 2{)Oh, 1..,1~,C sul)rn:ittt;{l the 1•esults ak't11c Vernal 1'a<)1 Assessnletlt to file C'olluraissit?n. At the JLr.ne I:?, 2{)Ofi Public 1-1[r:u-ing, the C:`otnnlissic)n accel)ted I.,F?G:'s ctnlclu<ions ,~-hich tivcrc; also corr(ibnratecl by,;l' lyla Lcologieal, inc. i~rl a letecr dated lutle 12, 2O{)i;. llvla 1'::c;ok)~'ical~ hlc. also pr(?vidc[l oval'sigllt dul-irlg the course afdle assc:ssinenl on behall'o#'Adam Collcn ()fthc'lyal,tl7 StrcetNei~~hbarhaad Associacicnl. 1'ropased.Project As revised, file hrnp[)scd 1)roject irlwolves the canstl•1lctia 1 of twctaty-three (2 ~} t(?wnhouse con:;tominiunl Lmits wit11 associate[1 appurtenances, iracludil7g a roatlvray ~;y5tean,..l7rztkia7g, (lrive~ti7ays, utilities, stortrr~vater tnanagetnent areas, <l:ncl (andscc~ping I.'eatuxe5 arl a S.frt- acre: prt)je;ct site. ':1'lle pl•opased l..inrit al`~,V'or>a, conl:priscd <)1'c.ntre;zicltcd silt fenci_n rf int~Ot~.ed by a '`5i11 sc)t;l:'°,at sp~ci{ic loc~.Lti[)ns as detailed. t)n 111e ;1it.(> I'luar.r. u°ili be- sihaate.d 17a cl[},t;r thtln "~S 1eet.lix)rla. the [)tt ~>i.tau'c=tlLla7d hattrlcittri~s, ~1~~=~[;rrty- (2Uj a.l` th(~. tu~czlty- tlirce ('? ) Lulity, coaltaice[l in 1laulti••l.lnit ~buildinrs, are tpgatell it1 c~.cess of S0.1.'ec~t 1.'r(rz1~ the wc~~ilarl[l, baun<laries. wl•lile the; ulajority~ a~t'tllc associated rbadwavs, dri~re~va~=t,,;1nd, larlr[cing~ ttr[sas girt:. r1C)~: ((?c;aicck oiltsitle tats 1 OC)- fat)t 1:3uffcc lozle.. `l'he propi)secl project will cotulect tia,thC: (:`ity's1'espectivr, sever and 1v'ater 5ystenls, thtr5 rac:l;ating ihea laeetl far'7"itle. V sept.i[; s}~ste'I:ns an[I privaie.evater>c11z1)ly ue.l.ls. Strn-n7tivat[:r nlanagu111ent will be handled on-siie thro11g71 a rain garden (a:.Tl~ d.esig n), praprie;l:ary treatnleni cbatnbt;r, in.:iiltratiou. trclic.h, rn.L11t1].7.1e C1z•y 'we11s, g7'asseca scvtrl~ . r~e;c:;p strulp hoacled c~ltch brlsins, land a C1C.tt;tltlan 1?a5)1't T~dllCCd ttl 51'7..1;. 'll'C)111 t.11C Or1.j~rrl.fll p]'[)p(.)Shc. 11nj)i;l'V'1()'nS ;1r~G14 011 :il:tl% V\rall 1T1Crt:S`;[: (?VI.I' t~ISttl]k? CUtldlttt)11S hV i~l)1)a'aX111'1c1tC'`ly 1.1 ~ t1Crt;5 21'a717 L:~7St'lrl~; C(711C7 t10nS et11Cl thC= 5't0171'lwiltk:r 1,I1a.tlat;['1'11C.111 SYStt'•1T1 haS bee'.11 CO[t5eC1t1C:171:1y d(`Slg1'Li;d tC)'n'raltitk11.11 Ol' 1'l',d11Ce 1)e;a1i f104v rates Clttt'1a1~ i'11C; ~•; 1{)-, azld k t)t)-yea'I' Stt)C111 ITt:'(:jIIC'11C:i1'`S. 1:3e5t irlan;:igt:ta'tel'lt l)ra(:tlCeS 11aVe 1)eel7 deVelOpe.d la I.'eC1UCC I'Lt71()'t]{. a17d'prC)])(:'.r1V tl'eat 1V8teC l1UrtlltV. 13E'talls Cll~tlaeStC)z'n1'tVater n"all'IilgCarlen~t 5}'Stel'11 dl (:'{v(?~11'il1)i:;11CriSlti(~'ly C1CSC1'1bL'tl 45~Jt1n11 Ihf .~~IC?r7IllPLfl(?i' lJrrxinc~rs;r~~2ePun°t, prepared by the 1''rc)iect lalgineers, "1'he I3erksh.it'c 1.)esign C.;rOup, h1c., revised oat T~ebruary 1 ~), 20{)x). A l''rc)Tx)sed .Storzrrl~'`,rtcar•,~t!!(z),cr~;(tnau~n; ;Svsterrrt,~)~)c;r~r{iarr <:~:.;t~hrintc~raczrtc<> I:'Icrrt, S7nr•»r1~-cztc?r' C°'allrztiorr T'rcv(>.ratirrrr T'lan, tlnd Lang-T€~r-rrr I'(~l.I~ir.tiorr T'r~)(~rtr.trn~iz 1`'lnrr arc also inchztlcd as ahhcrl[licta Gti~itl'lin tl1.e ~~'tc>r'rrtlca.tetr.Drainugc~ Tzesl,xn't. 111 slzttllnary, file prot)asid stortllwater n1a11.a;genle;nt. syste;an. has bee11 designed i71 c[)rrforrnance ~vitll D.li.1~'s St[)la:nwtlter r1~Ianat;elnellt Stan[ia1-[ls. 4 0 l' 8 c;r,:rx,ia~,;;f:.°;" 3=}I_`'~7C)73-'s '<if?;!~:i_F'l'r'1_? V+IC?t`is;FS'r>°:F$ Rird~t5e; adi-? n Mitigation Measures Yl'oposc•d rnitiga'tiorl mc.asllres, described ill a. Ivtarcla 6, 2UOn~ letterprepareci by the Applicants, include the 1.11].1a.1.8n1elltati(Jq Ul~all 1:l1VilSlVe: SpeC1GS (:Unt1'Ol lat'UfTr£1117., con.versi.on ()! GX18ttlt~ l.ti\Vli itTGa;i t() ^iitlVe Ver;e.tatlUn, tll"iCl. 17i.11:7V41)171C1t1TI.,L',s alUllj; lilt: ('dat1TC• .ll'Cnlt C11 ~~ lUOt l7{1~~I.C:r aI1Cl. tht', 51C1C SlC)~7(',S Ol till. Cf(:tl'.11C1C1[I 17i1S1Y1. 5peci9~ically, all. i lvasi've plants located bet~veerl the: l t)-3± i'i7ot l3uf-Fer lone; as ~depictc;d on fife .S'itr~ .l~'Irzns t~lrld gllllrally bl.hi.rt(i {.prcaposed) units l~l-'? 1; will be rlmo\~ld by hand and l•cplaced with llativl vegctaiion. L,XIS11Clf? lnt'88aVG lalants lOCaled W1t111.11 Cltl5 al'ea LC7Cltldc'., 3,7111: zt.Ce 1tOt 111t1Cfed 10, nlult1170ra 1.'OSl, 1'I C)Cit;;y'.,11e:kie, J~lpaltes(:' bal•beny, burnin~z bush, MUSSY buckthorn, anti rlsiai:ic, bit:tcrs\+'ee[. 'f'llc;e species have. been id(~;lltit'ied as "~lnvasive" by the Ivi~assach.usctts l.~ivisioll o~f'.l~~islteries and Wildlife (~2 lr~cricle to Irrz•rrsit'e 1'lru~ts iu ;1:Cc'ts.ruc•htrsetts, 300Ci) Llltcl Massaclznse~:tls 111vasive S1lecie:s rydvisoly Cr1-()up (17.tip./t~•.~~t~-.:alt).5si:ir:c:_+~r~~M.l.f~r~tii,;tl~~<tsiF~~;.li,ran). In ixelterall, tla.e e.xJaaa)sion ()l~tl)ese, slaecies clecl•r:;as(;s overall plant di~Tersity, eslaecially those species and .plant. coutnu.lilities native to Northampton and.1-Tampsll'irl C:()unty. ltestllting changes in laCartt species coltlposi.t-ioll a11.d decreases in •1:7ora clivGrsity inva]-iably reduces a\rcrall available food sources, nesting habitat, escape co~c~er, etc. 1'oa~ a \\~ide variety o{' \~=zld.ll(e specle;s. tlslde i'i°(am L~etar/u rli~rzr, all pxcapased native species .Dave bean canax~l~ecl to l)e "Na.tive" to I-laltlpsltize County accorclirlg to '<~hc C~'crsc•t.rlrtr•T'7rtrltr rr/~McrsscrclTa+serts: ft C'oirnt~~ C;Izerltilrst, prepared by Bruce. r1. Sr)17-ie tt11d 1''auJ Solliers, MA 1:3i\%isiorl ol'' F'ishel-ies find Wildlife, Natural .1 lrittYbc', alld ladarlgerc:d ~peci.es l'.rogrt7lxY {1 <)~)q), C'onsicle:ci.ng rile pr(aposed invasive species rlnlova.l i5 loe,eatcd il~pgradic:nt c)f (llc ilistiltrt breaks in sl(rp(,,;\vitlain t3uffcr 7ac)nc: arias ol'glncl'ally subtle. slopes, plam'reltlc>\Jat ~Iricl r(;plandrlg ~lcaivities slaclu.id n<)t destabilize rile cloWllgl adient slope. N~vecthelcss; precautiOlts should b~ 1a7adl to avoid aclvlrsely disturbin;>. fhe native vep,etativl raver, sttibility, and. substrate c)i'the 1U-3~ f(iot.tlui'ler lone. `l'hc Mat"clt b, 2U09 letter also out.l.illes spe:ciiic :fapallese kll(~tweed control zttensures for an a.rca locatc(1 b(;Ilincl {prapc)sld) uttiCS 11-1.~. Under existi.l~g corl(lit7olts, .ltipallESe kltotWC,e.d has. fgnnl(l el dense nlanoculture 1)etweelt tll.e 1.3VW alld lawn aa~ea surl•Otlndiltg file alt-site sillell~Ialitily d\velli.la,g by OL11-corra.laetillg raa.tive species 1't)r slaace. <znd res()llrccs. Titl laroposlcl ltaanaglliteltt tee•ltizicl>.les have b(.:lal de4irne(l t() in-lla.l.entent. the la('St rn%ina.gc:nleYlt 11'a%t1CeS deta'111d .il')USt 0i~i.CUE'(' and E:11till"C)I'11'Ylentdlly SC'1t:71tiVe 1:U1" till trE:atlllt:nt atlti succcsslil] cradicaliall of:Irl;aiinesi k:natcv`crd. `l"he sp~cli"ic larcitocal is 1.tasld atr `l"hc 1'~~ature C'anservancy's l3csl 1~-lana>;(~111cau 1'rtictices. ,R1s <>tatecf. tllia nlana~Yc:luGnt ~rt'c~~s \~ i1.1 be rcl~la[lteci \~ ith natrve sp~(•i~:; ;tc clet~:lsl(•c:l on the .iii(: F'Ccrrrs r:zncl closely ntol)itOrccl t:a instu'e that .lapallc„tic kltotv~'(;ud (lots not rc ••esttibiislz itscai: And {finally, fete. Ai)lihca3tts arc propc)sir1~ tr, repl~l(:e. alalal c»tilmrtte.ly :3,7UU:.t:: square i'cet O'f existinz l~11v11 as"(:a. betw€;ela tlt.e F3VW liaurzcicu~y a.ltcl iS.f:czt>t 1~u1'fc.r t,onc blltiz~i (:pl~t>laosucl) units 1 allcl 1 1-14 a.rl(1 the planting of native vetetatian a(anl; th.c entire 35 foot 1xit.Eca•. Si nilai~ to.[lze tibave, the proposed native planti7lgs arc,. Cle:pictc:d can. the ~S'ile.C'liurs. Perforntartce tandarcis ;1S stated abc)ve and flaorcr{IS;laly rlltaile(1 In t 1e.:1plrlicarats` s(apl)c)rting anatc.l-ial;~, tetra tarapr)sed prcxjeia is restl-i.cte~i to Work within anal upgl•adienrol:ltsidc Of the: 14U-faat.,l3ufflr Tone to l'xS;~, and l~'W. h!c) -•.~-arlc will aectrr \~=itllin any Wealtrncl l~est)ur(;c Elrcals pl•ot~cte('i Ylnci~r tl•Ir, 11~1'A andi"(ar thy. City, cal' l~loa-thaatlpi(.)n 1f'r:•tlzrrrls /'rratc~ct;"r~rr Or^rfi;~rr~;a~e.<`. 'll)ur~~(:II•e, fit(; l:)roje.<;t is specii~icGilly subject tc) rc:vievF. ulliie.r ,10 C~MIt t(i.U2{~?}(la)a,, ot`8 ~;a~r:~,u~~€:~~r t~tut~ota~r~~ ~t~r~±~~~a~~ ~. , ~~?~~~;~~~€~ ~t~tac~t~. ~~a iXa additi.c)I7 to thf; C,)rdinanwe. lrollorvi.ttg revietiv ofila.t; az•i},anal .NC)1, l.)ll? afPered the fic)l.lawittg, drratinb fi•on7 31() C:MTt 1().530): ...the issrrin~ alrtJrorit'p sJtall ir771)r)se carzditigras tnlJrotect thf> iJtterescs of'tIr(r flct iLIL~r7trfic~Ll.firr• L/1 C' !r('~/A(,'C'-Ylt J"('.<'DId1'(1Y. [7r'C(r, ~f fle.r)(7t'('1'7tlrll fr.)r' lrt1VG'r'SL 1111fJCTCL.S 1CJ 1"E'.i'r.'Jt.6r'f1L.' Ltr'<?QS ~7^Urt1 1a~0!"/C' i/9 zhr lJt1/f L'1"::011 f' 177a,p 1t7C1'f;'a.i'(? TVY(h ilt( L:\"tr'rr! t)~ th(t bVa1'Ji CU7d lhcr J)rOXtr)7rt1' t0 al1L' r'C?.SOt.li^C'C? Ctr['(.'1.. I he i,is'tttr:,~ urathurih~ nlu)' corrsidcv' !hi' (~h(u'cnrt~~rr'stit~~s' 7~l~tl7rt blrjf{~r' .>rr12e, sorb cgs' ilrc~ Jn~rrserr('c' rJf slf,~c~J s'/opf;~s, tlrctt rna>' ixxcrease the potential /i)r' CLCIt•ersfr impacts (7rr resource rr)^ep,S. C•or7ditilJr7s ntrx;7- nJCritdilc~ liraritcrtiorr•s nn tlae scope lrnd CocLrtk7n of \~'ark in the bti%/er^ ~vttc3 r.2s r1BCE'StSat"1' ICJ c7VO2d a1lC'1'attlJlt (r/' 1•C'sUlaJ'(7F..' aY(!lLS. .11t(.' 1,5.St1C1J„r Lrtdlharrh? IfLCtl~ 1'!,'Cll.tlr'f? (;'TL),Sr077 L7Jad SeG1177tL'J2tattal2 L'Drttr't)15 drtJ"ir2~r Can.S17^t{Cli!Irt, Lt 1;1L'Ct)" I1717t1 t7~ ~LVr)J 1(, LlI7rI 1hE 17J'(!SL'T'Va/IOYr rJf rlc2trrrul ve~f~taliora cacl "c'rceJat tri the r~(?sarn•L~e rxrecr ctraif,~or' vtJtc>I^ nar~astlr!?s c'ona.Jx7z~Jtstxr•crte za.-itl2 the scope and lncutinr7 cif thr.? rovorlc within tTtc~ btrfjerwne to protect tlrc~ incerests !~f t11L~ .4~ct. YG'hLare LI 1)Ll~~(?Y warJ!? 17L1S a1rBGtCll? IJC'O7 de7'(.'faped, thC? 7,5SSLLr1a~ Cttttl7at'II1% 1TtC7)' (1!)Tt.S'ICfL'r' thf' L'YtL?Jtl (JI f ristin~tr !iev=elopna(?rrt izz its rf:-vi(~iv ra/'stihseylrerzt p7 txpo.cec! 1~1~<)r'1( Land, vi'1r<s7°c J)rivr rler,i 1O~Jr77r,~:rrt is fr.:t7erlsi\!<. ntLty consider rrrfycz.t•Lrrl~s such ras the r~c~s~tln-ati!)r7 of nutrcr~cll ve,~crtcrciotz Lzcffcu;•ent t!) a rc~.corrx"cc~ crrca to prater.~r th(t hric7l•est vJ'thr,> ;4<a. "f`hc specific intcr(;sts of the ~~Il'r1 are Stated wltlatn 31 t) (,'.l~:llt 10,01 (2): pI•atectit~n ol•}public, c-roc( privtttc; rr'atcl~ supply, p.rotcctic~n of 4;raun.drvate,r st:r}~Ealy; llooct ccmiz•t>1, storm dasna.~;e }~i'c;verltinl~t, p.rt,vcz~titJn caa'pollutiol7;. 17t'OIECt14n c>flat:Id L(}ntilTlltn~ s11c.11'I~lsh; }lI`a[~ClIatl a.f ~tSh(,.tICS;'tlld }7T`(?t'eCtI011 O~\"JL1d1Y1.C~ 11a1).lt.0t. ~S]tlltlit1.1'V. t~a8 C)rrliracrr7c(> identilaes specific t•esatzrce area values, inc}udlzlr,.but IlOt limited to }?ublic r~atea~ supply, private water su}~pl.y, s;I°atulduFater, tisJ~erics, wildlife, r~ilcilife habitat; z-are species laabzla.t; includ'in~ rare. plat\t species, recreation, agriculture, aesthetic ~-a.lues, flrlad catitrai, erosic~7a and sedime.tltarian ccnairc)l, storm rlal~nage: pret•ent~an, rx~'ater duality, atttl preve,tttic)n of ~>atci' pollution. `3cc;tiot~ 33 i-lt7 c)f the C)r•dincr)rcre sxttlines Spcciftc €'erf(Irt~iaTZCe Stazida:rds for}~xcapased pr(.~3eets ]c)cated within -ttAl"tSCll"ttlOltitl kli'£itS alp t}tk' {., CItllintSSIY3t1. ~~C)n~i(l.trin~y, tl1ilt the }7I"<?)t:C 1l£IS bc:c.n Clitahl'led iii °-izTtill C1eVelf)})tllelll,'' Sectlatt _;37-1 t)~)v~) apl)11£'s: t(J C'rICO1JY'dl,£!L' r!'t~lil F.'leFelr)7)r)7('.tll, lYltt('lr i5` Cl711.Si(le7"!'(I ntlJrr.< SrdStclifEalJ1G' ttJ2Llf'r" t11Er J)rN7l,.'IX)]L?S (7~.S/71CL1t,E;'i•t)bi~tlr Crrt4l,tr(:"/7(.'TLII/J' ltC1.! a ,S'/7761/1(:x" (•'r'J'1'h'Or'.'rI7GJ71ClJ fUOtl)!'Inl Ihlrrt deuc./lrlJrrrenr ir7 r,L6tlt-irt„ ar^e(JS, itz thL~ C."cr7tral Iitd.SirtLSS,~ t.rt~nc~r'cJl 1.iLlsinds . I~/t,~;hv~'cn~ 192rsi7urss, i1%ci~hhl7t•Jar7acC 13Lhsiraess, tiL~r7ftrallndtrstr•i.rxl, ~SjJecicrl, Ir7dtrstricrl, 1'lannccl Gr1lrr~r, lledrlaC, t:ir=l]rtr7-T~f~,S•identiirl•-13 arrd r:~rbcnr hcs'iclL~rzrial-C:' .~or7in;~ l:)rstr•ic'ts, tvrtlrirr thusr;' IJC)rtiirrrs c)f t/7c 1.1-'(ttfs)- ;Sub?plj~ .Nr•(itcrction (.)vc?r•/ca}% 1,:)isiri(.~t tvhi(~/r ~trlrs ~nr7l~rl inrll.rst7'•ial as nf',Inrtuart' .l, ?(106, the C'orrseJ~uation t."ornntissiOJr. hear^el~v ta~aives• ttrtr n/'t12cr .~' .33?- l tJ prrr,(i)r-rnarxc~e starnlcrr(1s' that arer. aire7° and abarL: state lLrin: r1:if17 the e.ac~el)ti--arr. t7%'tlu~ sf>11Jrrch re.dLair^lrraaerrts in Tal)l(> (11. .The resdu<:c,~rl sczl)clc;lr r•fulttirc~xrre)7GS in 1'lr61r~ (1) s/rcrlt crppJy, l~•or LIlt13 :caning. districts; Table i stipulates a 35-faoi "NtI l:ncrcrtclttt~~nt %ont~'' li'rln7 wtxtl,:nlds. [t,hottld lie ru)t.r:d that a ]t)-tca:7t "Na 1:=,uerc)aclarn~Itt Z(»vc" frc~tn ro'c;tlands n'rcrt' l?c' a~llr)u~rrif crt rlrr,rlrs,r retiorr !~/ tlr<~ C'(irrs'er'valilirr C:`vrn7aris:ci<)rr il~~thc' ~L~)plictlrlt(s) proi•i(Ifrs ertr•ctor•rlinart~ rrliiirddtion, r•o-~pli(;u rou r r•Lelr)x^atiar7 fu' Opc rr .S;trlu:•(> presel"vr.rtiO1x r7lecl.ru7•ls. "l•he tip}~licants havi; specifically recluct;cl the zr[Ilcrultt ai prtpc)sed•~~oz']c Fif;tavities located withil~ ilze a.{)t)-.tot~i 13u.fter Zone and ltavc: sigcl€licantly increased ~=etlancl l3u.i'fer bane setbrtelcs frc)na tt~e ari~,'inttl proposal. ?1 ct.trret:tt:ly praposetl, t:he l..,itlait c)f' ~,%ark. i;aznp.risecl al'cntrettched:sift fencing rc:irtforced by a. "salt sc7c:k:" at specific lacarions tYS detailed ort t1Le Site Plans, will be sittr~ttecl rto closer tlala.n 3,5 fi:et f'ro:n the aiz.-s.ite wet and <;~ t7f' ,_ .... i. ~=.'lib`I~L~ f 7't r a a_= „,.3 ' Ya1C1't`i(".. w'rcF~ P~1tNtiC.~=, C`1$i boundaries. As laroposed, the I..;'r.tniC t)1' Work is located upgracii.t;lat c)Fany disthzet hreaks in sk)pc abzrtfing the. 1.3VW aI° IVW. Inst~illatiora of these ertasiora control laax•I•iers wi11 serve; to insure that all. coarsta~nctioaa act:ivi.fies rc:nzain as Far f'rtanz t:1ze lvcll.ata.d hc>unclaries as possible <Ind prevtrn.t any st:dizrzcrttation that n•zay occ;zn• duriazs, work. actiivities. All. baa•t•.iexs will. be nxa3nt~ained fluxing cox~strutaiozz fond wi11 remain izz place anxtil al upgradielzt azz.cl suz~•ourtcii.rag disttrr•bed areas are stabilied by ~>cgetalion as depicter[ on floe. ,site I'Ian.s. As currently lsropost;d, the. prgject corttoa~n.s tc> the 3:i-fuot"`i'~<)1.-Incraacltrnent ~c>n.e" .ta•olxa ~vetlarrcls. Crc)sic:>.ra.-sedimeratatior.a c;oaatrol v,zlucs are also I)reser,.eci. ti~%i~Clz the iru;ruased wetlrlazd .1~Icr['fer Zone sr;tlaac[<s, Cr~~er)ty (?U) o.1.'tlte t~rretaty-th.re~; (23;) uniis, carztaiaaed ia) multi-unit Ixuilrlings; are locatt:cl i.n e;r.eess caF ~U feet fi-citi "t.l~e tivetland. bola.ndaries, while t11r; aa7<tjt)rity t)t"the <zssociatc:d roadways, driveways, and parkirz~, areas are. rx)iv olttside the I.UU-fi)ot E3ul'fer.Zorzt.. As irnl)er-vious areas on-sift; arlll IaaCYOaSt; }7y ap1)t'Ufianzat'C;ly 1.1t) aet"C'S criYe1' eXlSt'haf? CC)ncht1ra11S, the 1'rcljr;ct C:inginee;rs have designed t.[ze stanaawa.eer taaana~;enrent system to natrintain six rechtce:laeak ~tTo~v rates during t:lze ?-, 1 U-, alacl 1 OU- ycar storlxz Frequencies fox IJood control ilztcrests. 'T7ze iutegratc:d stortxa4vat:e:r Features, iucl.uditzt; C1zG t•ai.Iz gaecien ('[:,II) design}, Proprietary treatment r;hanzber, infilti•atit)n trench, anultiple dry wells, grassecl swales, sleep straxtp la<.u)tled catch l)ttsins, and cletentiotz basin ~~~ill serve to Izromote cleaaa water recharge, irraprove. strn•rrn~raCcr gt.a,aliry, titter i)oteazt:u!1 pollutants>, maintain or~redt:rer<tiuao.i'l~volutz'1es, and generally f~acilitate~ proper intilet°atio~n on-sift'. The upcJated ,Srs)rrnu~ntcr• ~)r•crarurt;~tr lc'l7Ori {z•evised l~~ebr•uary 19, `?U09) alorr~r, wiilz the 1~'ropr~seYrf .Storntwatc>r• ;1~Icz%acr~;renae;rzt :Sj=sten~r ~)l7er•r%lrn~i cC~;llurn.de~lance 1'Jurt. Srarirr!,:rrtc~~ Pi~lrt.tr~rorr ; ,: ; f'rei~~.>?rliurr I'larr; and I„orrg- 'e~•nr 1'allr.t~icin 1'r•e>ri;rrlion /'lair a4 :7p;pendices, spc.ra:fiCally addresses laocv the prapcasc;d stnrm;~~ater rraanagea)aent f'eattu•es will lac Inai.ntazirred. l:ca rnsare propea` ['utzctiolaa.l.ity in Clze loaag-ti;rna. It is rzaCerWOI•tis}' that. t:lze Appl.icanis have: cx)nzznitted to pluhil?itialt standaxd de-ir;iaag rxrrtc.zaals {r,.g., salt} as part oFtlaeir Snt)w Ttetnovsrl cQ. Managc.uzent Ilan. C7ta I;.IIat enc1, L,EC' rvou.lcl highly rccommentl mirlinaixint>_ t:he use: ol'l~.rtili~exs atad exr;essivt; i.rrigat.ic>n'Par tlzt~,proposed.).awn a~zdror 1an~tacapt;d crit<as; especiall}~ within the: 1 f)U-Foot- I3ctfFer Zone. [1'nr;cessar}=, L1C' '4votrlrl recoz:iaXaetad;zrtilizirz~; a gxanzalar or organic slow-release nitrogen tet-til.izc;r, sparingly, to avoid arzt> poteaztial cuaaxclati~-~ rztttrietzt.loading. Strict adherence to .these raaeasrrreti ~a-iil tar{atect the znterest and values oFthc acijai,erlt G~'eClzznd ltcsotrrce areas; iaaclrrding fi11e protectir)n c)Fjaaablic%In•ivat~ writer supply, grouracawai:er, pc:rllutir>n l.)re~~eaztic,)n; aesthetics, rznd w~aiea qu,llity. "17ze proposed raaitiga.tian raae<asures (im°asive spee;ies cc)nt7-ol prr)trarn, r-ephacerrae;rrt of existing tar n with native vegetation, aiad,plautitig o!'native. vegetation along d~ac raittle;3~ f«ot bulfe:r} z.~,.ill ea°thance rlte ajctltaxads' 13uf1'er Zc)rze in r;orrtparist:~ra to existinlx cc.,ndit.icuas, h..erntwira~; flat, rrlvrarive siaecits ar.td re;placiaag witl:a alative ~~t;geratican wi11 pa:~ovide aclditir)nal, rzew wildlife hat)iitlt (c. h., Fc)ot1 sources, rostzrz~rlsh.crltez•, lzxeeci.irag, nc-sting, rn igraloay) Ft)r a ~}r:i.de varie-Cy ol~ insects, rol.)lilcs; rrratruilals, ~tr7c1 buds. "1'1'Il: 1]t'UpOSeC[ plat][. CC1tTtllatl1111:}' 1.laS 1)cen spcr;iiical.1y selectc,cl. to irtcz•ease species cliversil.y iraad Ft.arct;ian as a tc)oc:i sc.>uxce while; pr~oviciin.~; escape cover ~l'ar a wide 'veu-iety c>C ~~il.dlife.. "1"he: erahanceci [3uf~Pri~ Cciiie. tivill ~f~unction better to sloia~ azu1. xeriucea~ floe passage caf Flncxl ~1-<tte:rs during pe;riocls of• peak: flows by ptnwsi'clit7g~rulclitional ,zrt;a 1'or- tt;r:rrpor°ary flood wetter stor{ago; cn~id by Eacilitatixt~~. m'ater' ce~n•ar)val tlzrou~rh evrapolalacan,`f i,araspia:•atio:n. tandlor grc)un.dwats~r reclzar~?e. f.h~ eaugtraerrtccl 1~3uiter font; plaaxtings ~ti-ill bc~;tier ser~•c to aer>uwc or cit~t4rira gray sc;dinzcrrt.;, !natriraats (e.zt-, nitrogen arzd phosl)laoraus) oa• toxic. sr.abstaraces (such a~ lat.avq~tnet~al carraparrnds) that may occur in Tula •c)11'aazd f~ooc[watexs. Furthermore, ~zesihetics will tae. greatly cr?.lta:ncerl by zliverse; native. vegt;tation as oplzc)sc.rl to the invasive s}aecies cru~•enily damirlatizx~y the. 13u1`fer-Zone, 1 lziis; iht; restol~ri 13atficr :Zane: ~~•ill br: enhlnaced t)ver existing coza.cliiions to protect the ~~%etland Itt;snaaa•ce Areas ~aucl their interests anti valraes. P.roposeci ra~IOUiiorizz~ z of 8 Gam`!"Itl~~?~~:'e PL.'IVd`e.)l`Tr~a ~~xr,a'~t~S''I~~Lt,) Vti~~RG~:'.:3'E#? a31a"4CDGfr., Nhi n ~~'ili insll~l•e a .yucoc5s{'ul covcratie tale 'For the 1?Izuatili~.~s and i.irc.~-eut invatiive spee:ies e;nero~.lcl7n)ont ~~,~it'1~rin tl7e 1nii~i~~at.ir)n areas. Surnrnary On br;ltalf of the ~1pl~lic;anis, iVt)rtllcrn Avenue llalnes, li7c. rind 7'ofilta Associates, .l.rac., .[.,:1',C; has prep.~'1°cd this Letter to supplement. thc; prewir)'uslw submitted NCJI I'or {:hi;1:)ropc)sed cotlstrucfit)n trF twc7.?ty-tltl'ec; (?3) t.c)wuluxu.se cr.)ndanaittiultt units ~vi.tla. assc)ci.ate.d appu:rtenaatces an a S.t7-~ rtere'prn;jcct site loe;~li'ed a{'t'N<.)rfliea•n ~1vea71.le. anal Nartl:7 Street' in Northantpt~n, Massaclarlsetts, Since tale o:ci~iual ftlin~, fire scope r)f'the project has been si~ttifi.caatt.ly rerl7aced in size, tttosi notably 1).v increascns~ ~~edanri 13ui'ier !c)ra sc;t.backs, tlil77inatira~ ttvr.a l.lnlts, ;.;.1x:1 re.cola{ir;~urlran the storltnvater ra~aan~he.nlel7t systan'l;:wlvle ar7cral'poratin~; _l..l`1) deslt~~n cancepts, aa)d. reducin{; Chc: at,~crall amount oCi.lrlperviaus surlGicis ~.vithill ;~be at)t7-L'aot 13uf'ter TeJUC. i°ua1 ~lesrrrlore•. iarupr:l~sed uaitic;i"ifiian rrleasllres larrvc been significrlxltly a.ll~anerrfekl tc) restore anti errhauce thc; an-site; ~vet.lands' 13u1~1:cr lone, 'invariably providing el lall~;-terl)t t7el bel1c:l'll t() ~)vetlFlllCl 1Ze50U1't:e: t~l'GeIS. In C'a17ciUS1C?1.7, Cl7e ~"Jr(:>lee%I: ilaS been. designed to <tvc?id ~~clvea•se: in)pacts, iu adcl.itic?n ta.protecting anc:l elal7alaeink; tlte'interets and values oi~tl7e c)n-site Well~7rad Rc.solrrce Arcas aru3 ass<7ciated .Buffer !canes. ;` ' Shaalei you !ratite arty c1l.lestirJns ar recluil'e ailcti.tiai7al in l`cia•i~lit~.fora,'~)lerzse. da I)ot Iaesitattl tra cc)17tact .L;rian t\~Irldrieat ((lntiidd(:II~GUIeCP,I7VIraIIn7P.t'1ta:i,CC1111) at 5{}g_7=FG-991 br A.nai S~Tactan (atHarlon("callc.c;cnvironn~cntal.caxla) tae Slte;erely, , .. 1_EC Enviranrrtcrttai Cansuitartts, Inc. 13ri.ai7 '1'. lviaclden ~~'ildlife Scientist e;r.: Ncirfieeri, Avc;nuer t°tcpel~s, tnc. % ~I~oJino Asociares, ln: Anrl i~{; l~'lartola, k'residcnt 1.?irectar c1f Icr>lagical Services 8 of fi o~~~;,art~~ t~tw~°~~rsu'rw Yv~~t=~rF t..x.; ~anc~S'r~r~ 1~lr~r~cr:, r~tt (, (413j 25G-0321 31 Campus F'laza Road, Hadley, MA O1U35 March 9, 2009 Northampton Conservation Commission City Hall 212 Main Street Northampton, MA 01060 RE: No Disturb Zone ~ ' Notice of Intent ~.. North Street Condominiums , .. ,~, .Map 25C, Parcels 12 & 17 :'t ~ :., , Dear Members of the Conservation Commission, . There has been much discussion regarding impacts and/or potential degradation of the 35-foot No Disturb Zone by human activity over time. A row of boulders with 2-foot gaps between them is a solution that has been proposed. _ , We ask the Commission not to choose that solution because it is generally an aesthetically unappealing approach to the problem, without offering a comprehensive solution. The boulders will not keep people out of the No Disturb Zone. It is still possible to dump trash and yard waste or take down trees, for example, behind the boulders'if`someone were so inclined. It is of limited effect, but maximum visual impact. On this site, all of the 35-foot wetland buffer No Disturb Zone will be owned and administered by the Condominium Association. The likelihood of individual unit owners extending their yards into the No Disturb Zone is much less likely than.would be the case with a single family home where residents would own the No Disturb Zone property. Individual residents do not own the property, nor do they have any right to take personal control over it in any way. The Condominium Association will be contracting with a landscape service to do all the lawn mowing and maintain all the plantings that are on common land and abut the 35-foot No Disturb Zone. The Condominium Association is responsible for the property and can be held accountable by the Conservation Commission for any and all impacts as outlined below. We would like to propose the following measures to mark and maintain the integrity of the 35-foot No Disturb Zone: ~ ' ' "' '' `' • A portion of the 35-foot No Disturb Zone will be'marked by a retaining wall. This wall will be the limit of activity and use behind units 11-14 and the edge of the common open space between these units and units 15-19. ' ' `"'~ ~''`'' ;'i • The rest of the 35-foot No Disturb Zone, with the exception of the area around the detention basin, will be permanently marked by concrete bounds, set 2 feet above ground Ftur..,, `' !Ilr.5iu• Im'cs[ij;,[[irn[s Subsurracr Invrscir;at.innr. o Ih+Ilmiou Remcdiutum ~+ LSl' uu titall d rnrcnsu•5cptit'.Inacslip}}Ilion>; INarch G, 2009 iJlr. Doug Kohl Kohl Construction 33 Campus Plaza Hadley, Ma 01035 RE: North Stl-eet Neighborhood Assoc. Effects of Norway Spruce Removal on Hydrogeology. +' Pcrcol:uiun'rests o tieptic Uc;:ij;n:: u I:c~,ulntury l:ompliana+ Rccvrlii ;; and tinli:i \1'a:•. c ticc~nnl(11~tmuns The document from IVIr. Jono Nieger, a Landscape Designer of Regenerative Design Group is reviewed by the writer. iJf primary concern is the miss-application of annual plant transpiration uptake in an instantaneous calct.llation. l-he uptake of vdater by plants can and sl-lould not be applie(~ in a "closed cell" nor used as an "instantaneous rise" model as suggested by Mr. IVieger. Specifically, the assun'Iption here is tl7at the trees are removed and all at once that (annual) water volume that vuould have transpired to the trees is immediately "pumped" on the watertable. The annual water uptal<e should actually be applied at the very least over a 5 month (150 day growing) season. By dividing by 150 days we find minimal response in height of the water table actually about 'I/'10 of one inch. IVot only are lv~ir. Nieger's assumptions incorrect, he ignores that the groundwater is sloping and continually wisl<s new water that infiltrates from the satiate dovron graciient into lower reaches of the aquifer rrluch like a conveyor belt that continuously runs. In addition enhanced evaporation from the lack of shade trees to an area that vvould receive increased sunlight is also not included in his analysis. Finally, "Hydrologic dynamics" such as groundwater recharge, infiltrafiion and storm water drainage design actually dvvatf #Pansg~iratir~x ~si~~iarats in most settings. I vui(I cede to Mr. Niger that good site development design incorporates consideration of pervious vs imper<iious cover, storm water drainage recharge and landscape design that incorporates re-planting and water gardens in order to offset changes and result in a zeta sum change to the 1Nater Balance. A sound ecological approach in compliance with Stol-mwater Recharge Policy has been incorporated in the design plans. CoJ~~ Spring Environmental Consultants Inc. Alan E. Weiss, M. S. Principal Hydrogeologist IUTA Licensed Soil Evaluator lVIA Licensed Site Professional ~~J'.~ l~P~ll?~~ ~„k~SF.~EL~~1tE°fi',ht~h`'~"~~nfi.,, ~1Ti~~~AIL,"1!'~.ti~5"i1'~ )•lli`~N~ a 350 Uld Lnfiekl Road =_ ]ielchumwn, NIA. 01007 = !?hon.e: 413333.5957 hat ~I 13.33'3.491ri email: ~:•t:~rb;.ri;cLane.m:?. ~1•~~r~a'.roldsPl'iu+~env.ironmenCal.rnn7 ..................._......._.... ..... r ~`, ~ ~ ~~ C~ ~ J u DECLARATION OF COVENANTS AND RESTRICTIONS, EASEMENTS, AND MAINTENANCE AGREEMENTS This Declaration is made this day of , 2009, by Tofino Associates, Inc. ("Tofino") and Northern Avenue Homes, Inc. ("Northern"), the owners of two parcels of land with frontage on Northern Avenue, as shown on a plan of land entitled "North Street Condos, Special Permit Application........, Northampton, Massachusetts,", dated ,2009, and recorded with the Hampshire County Registry of Deeds at Plan Book ,Pages (the "Special Permit Plan"). For Tofino's and Northern's ownership of the premises, see the following deeds: WHEREAS Tofino intends to install a pressure sewer line and an 8" water line in the locations shown on Sheets of the Special Permit Plans approved by the City of Northampton Planning Board for North Street Condos (the "Sewer and Water Lines") for the benefit of the dwelling units which are recorded in the Hampshire County Registry of Deeds in Book of Plans Page ; WHEREAS Tofino intends to form a Condominium pursuant to MGL Ch. 183A covering the land shown on said Plans, Book ,Page the common areas of which Condominium will be managed and controlled by the Board of Trustees of the Condominium Association (or Homeowners Association) (the "Board of the Condominium Association"); and WHEREAS the parcels are subject to a Decision of the Northampton Planning Board, dated , 2009, and recorded with said Registry of Deeds at Book ,Page (the "Planning Board Decision") and an Order of Conditions from the Northampton Conservation Commission, dated 2009, and recorded with said Registry of Deeds at Book , Page (the "Order of Conditions"); and WHEREAS Tofino and Northern wish to provide for the on-going maintenance and repair of the roadway, sidewalks, the Sewer and Water Lines, and the Stormwater Management System, to establish a monitoring, inspection and maintenance system for the 35' No Disturb Zone to the wetlands, to maintain the Common Open Space, to establish utility and other easements to meet the requirements of the Planning Board Decision and the Conservation Commission Order of Conditions, and to establish other restrictions, covenants, rights, and obligations affecting the parcels; draft Restrictions and Covenants 3-9-2009.doc ;~ C :- ~~~ NOW, THEREFORE, Tofino and Northern do hereby declare that the following provisions shall encumber and/or benefit the parcels, roadway, the Sewer and Water Lines, the Stormwater Management System, the 35' Wetlands No Disturb Zone, and the Common Open Space: EXCLUSIVE USE ZONES Each Unit shall have an exclusive easement for gardening and planting within feet of the exterior of their Unit; however all planting must be approved by the Condominium Association and the Condominium Association reserves an easement through said Exclusive Use zones to run utility lines and water and sewer lines to serve the Units in the Condominium. Each Unit Owner shall own in connection with their Unit all sewer lines and piping from the interior of the building running through the foundation to the sewer ejector pump which shall also be owned by the Unit Owner for each Unit and Unit Owners will have an easement across the common areas and through the foundation for their respective sewer piping and sewer ejector pump. ROADWAY (Name of Street) Prior to the formation of the Condominium Association, Tofino and Northern shall be responsible for the obligations set forth in and upon the formation of the Condominium. The Board of the Condominium Association shall be solely responsible for: (a) the maintenance, repair, and reconstruction of (Name of Street) at all times so as to maintain it in a good and passable condition, including without limitation, deicing, snow removal, and paving; (b) the maintenance, repair, and reconstruction of any sidewalks located within the development at all times so as to maintain them in a good and passable condition, including without limitation, snow removal and paving; and (c) establishing Rules and Regulations governing the speed and use of said (Name of Street) and said sidewalks, to be recorded hereafter at the Hampshire County Registry of Deeds. Tofino, Northern and the Board of the Condominium Association are forbidden by Condition ## of the Order of Conditions to use any deicing salt on any roadway or sidewalk. An annual acknowledgement of this requirement by the Tofino, Northern and the Board of the Condominium Association as the case may be, shall be provided to the Conservation Commission by September 1 of each year. The Roadway shall be maintained, repaired, constructed, and reconstructed at all times by Tofino and Northern prior to formation of the Condominium and after the formation of the Condominium, by the Board of the Condominium Association so as to be in a good and passable condition, including without limitation, paving and snow removal; and any grade of the said -~- draft Restrictions and Covenants 3-9-2009.doc ~~~ ~~ roadway shall be reconstructed and maintained with a surface of bituminous concrete. Prior to the formation of the Condominium, Tofino and Northern, and after the formation of the Condominium, the Board of the Condominium Association shall meet a minimum of once each year to review the condition of the Roadway. Prior to the formation of the Condominium, Tofino and Northern and after the formation of the Condominium, the Board of the Condominium Association shall determine when, to what extent, and in what manner, maintenance, repairs, reconstruction, and other work on the Roadway shall be conducted. All decisions shall be determined by a majority vote of Tofino and Northern or the Condominium Association as the case may be. If any of the Condominium Owners has work done which necessitates digging up the said Roadway and/or sidewalk for the sole benefit of said Condominium Owner, then said Condominium Association shall be responsible for returning the Roadway and/or sidewalk to its original condition and the Unit Owners who benefits from such work shall be responsible for paying for the cost thereof, and in the event Condominium Unit Owner does not pay such work, the Condominium Association will have a lien on the Unit as a special common charge. (Name of Street) and any related sidewalks and all easements granted herein shall remain private and Tofino, Northern and the Condominium Association or Condominium Owners covered by this Declaration shall not petition that the City of Northampton take over the maintenance of (Name of Street), other easements, or any related sidewalks as a public way. Tofino, Northern or the Condominium Association shall not install a gate to prevent public access to (Name of Street). SEWER AND WATER LINES Tofino and Northern prior to Condominium Declaration and the Board of the Condominium Association upon formation of the Condominium shall be responsible for managing the Sewer and Water Lines, including providing for periodic inspections, coordinating any required maintenance, repair, and reconstruction over the lifetime of the Sewer and Water Lines, and establishing any reserve accounts it reasonably determines are necessary. Tofino and Northern shall have the right to install all water and sewer service in the first instance and all connections to said service for individual units. If a unit is connected to the Sewer and Water Lines, the Owner of said unit shall contribute a proportional share of the costs of inspecting, maintaining, repairing, and reconstructing the Sewer and Water Lines, including making contributions to any reserve accounts established by the Board of the Condominium Association. -3- draft Restrictions and Covenants 3-9-2009.doc (~~,) Tofino and Northern prior to the formation of the Condominium Association and upon the formation of the Condominium, the Board of the Condominium Association shall be responsible for the inspection, maintenance, repair, and/or reconstruction of the Sewer and Water Lines as a private responsibility in accordance with the provisions of this Declaration; the City of Northampton shall have no obligation whatsoever with respect to the inspection, maintenance, repair, and/or reconstruction of the Sewer and Water Lines; and Tofino and Northern or the Board of the Condominium Association as the case may be shall indemnify and hold the City of Northampton harmless from any and all liability, expense, or cost of any kind with respect to the inspection, maintenance, repair, and/or reconstruction of the Sewer and Water Lines. STORM WATER MANAGEMENT Tofino and Northern prior to the formation of the Condominium and after the formation of the Condominium the Condominium Association shall be responsible for the ongoing costs of all storm water management associated with the development in accordance with the Storm Water Management Plan on file with the City of Northampton Department of Public Works. Tofino, Northern or the Board of the Condominium Association, as the case may be, shall be responsible for full and timely compliance with the Storm Water Management System Operation & Maintenance Plan, as follows: 1) Street Sweeping Street and parking area sweeping shall take place twice annually. 2) Rain Garden A rain garden/bioretention area has been incorporated into the stormwater system to remove pollutants within the stormwater runoff. Both the pre-treatment stone diaphragm system and bioretention areas should be inspected monthly forsediment build-up, litter and debris, structural damage and standing water. Inspect soil and repair eroded areas within the bioretention system monthly andre-mulch void areas as needed. Treat diseased vegetation as needed. Remove and replace dead vegetation twice per year (spring and fall). Remove invasive species as needed to prevent them from spreading into the bioretention area. Replace mulch every two years in the early spring. In the winter, it is important to ensure that snow is not plowed into the rain garden as this will cause the runoff to bypass the system without proper treatment. 3) Detention Basin (The following recommendations follow the MADEP stormwater Policyguidelines.) -4- draft Restrictions and Covenants 3-9-2009.doc ~~ t~~~ Inspections (a) Initial six months of use: Examine for stabilization and function, including determination of the duration of water standing in the basin, any sediment erosion, excessive compaction of soils, or low spots. (b) Twice per year: Examine basin for the following: differential settlement, cracking, erosion, leakage, or tree growth on embankments, condition of riprap, sediment accumulation, and health of turf where applicable. Any adverse conditions noted during any inspections shall be addressed by repair or reconsideration of design components. Mowina and General Maintenance Occasional mowing (1-2 times per year min.) shall be performed on the sideslopes and basin bottom where turf is present. Accumulated grass clippingsand/or organic matter and trash and debris shall be removed. Any clogged surface areas can be loosened by deep tilling; tilled areas must be immediately revegetated. Tilling may be used in this manner for no more than two consecutive maintenance periods. Thereafter, sediment in the clogged areas shall be removed, liner material replaced, and revegetation established. Dredaing/Sediment Removal Accumulated sediment shall be removed from the basin at five (5) year intervals,or as required to maintain the function of the stormwater management system asdesigned. During this process and until the disturbed sediment has settled, theoutlet pipe shall be sealed so as to minimize the risk of conveying sedimentbeyond the basin. 4) Grassed Swales Swales shall be mowed at least once per growing season to prevent establishment of woody growth and other undesirable plants that inhibit proper performance. Grass vegetation should not be cut shorter than 4". It is important not to engage in excessive mowing operations, as this keeps the grass too short and decreases the efficiency of the vegetation to reduce runoff borne sediments and velocities. Sediment and debris shall be removed manually at least once per year before the vegetation is adversely impacted. 5) Hooded Catch Basin and/or Drain Manhole with Sump Oil and water separators should be inspected at least four times per year and cleaned annually or more often if required. Oil and sediments -s- draft Restrictions and Covenants 3-9-2009.doc ~~~ ~~~ should be removed grid disposed of in accordance with local, state and federal guidelines and .regulations. In the case of an oil or bulk pollutant release, the system must be cleaned immediately following the spill and the proper authorities notified. 6) Stormwater Treatment Chambers The Stormwater Treatment System requires minimal routine maintenance;however, it is important that the system be properly inspected and cleaned when necessary in order to function at its best. The rate at which the system collects pollutants will depend more heavily on site activities than the size of the unit, e.g. heavy winter sanding will cause the grit chamber to fill more quickly, but regular sweeping will slow accumulation. The water quality treatment system shall consist of Stormceptor or equal treatment chambers. For more detail of how the Stormceptor should be maintained see the Stormceptor Owner Manual. 7) Dry Wells Dry wells basins have been incorporated into the stormwater system for the site to specifically receive roof runoff and, therefore, are not expected to receive large amounts of bulk sediments. Proper maintenance of roof gutters that drain to the system will help to protect the integrity of the infiltration basins. Sediments and debris should be removed and disposed of in accordance with local, state and federal guidelines and regulations. 8) Snow Removal The stormwater management system is designed to accommodate volumes from snow melt. Since plowed snow from paved surface may contain sediment, oils and various pollutants, all snow melt from vehicular areas on the site shall be routed through the drainage system or removed from the site. Snow removed from the site shall be disposed of such that it or its melt will have no adverse effect on other resource areas. Additionally, prior to the formation of the Condominium, Tofino and Northern and upon formation of the Condominium, the Board of the Condominium Association shall submit to the Office of Planning and Development annually, no later than November 15th of each year: (1) maintenance reports with documentation on the conditions revealed by all inspections and (2) receipts for all cleaning and work for all items specified in the Inspection and Maintenance Schedule of the Storm Water Management Plan. Each such report shall indicate the status of each element of the Storm Water System covered by the Storm Water Management Plan. -6- draft Restrictions and Covenants 3-9-2009.doc n C The City of Northampton is hereby granted an easement to (a) inspect the Storm Water System and (b) to perform specified maintenance obligations of Tofino and Northern or the Board of the Condominium Association, if the City has notified Tofino and Northern or the Board of the Condominium Association in writing that specified maintenance obligations must be performed by a date certain and the Board of the Condominium Association or Tofino or Northern has failed to perform such maintenance obligations by such date. SNOW REMOVAL AND MANAGEMENT PLAN Snow shall be stockpiled only in the triangular-shaped open space opposite units 11-14, as shown on the snow stockpiling plan (see Attachment ##). No snow shall be dumped or stockpiled directly into any resource area or its buffer zone or within any area such that untreated snow melt may enter a resource area. Tofino and Northern or the Condominium Association as the case may be shall not use salt for deicing anywhere on the site. The Conservation Commission and DPW shall be notified by Tofino and Northern or the Board of the Condominium Association as the case may be where a violation of these requirements occurs. 35-FOOT WETLAND BUFFER NO DISTURB ZONE The 35-foot buffer zone to the bordering vegetated wetlands shall be a No Disturb Zone. Permanent concrete markers set 2 feet above ground level and spaced no more than 25 feet apart, marking the 35-Foot Wetland Buffer No Disturb Zone must remain in place in perpetuity along the entire length of the 35- foot wetland buffer; except around the detention basin and where landscape retaining walls are constructed. No activity, other than walking, birding, or other comparable passive recreational activities shall take place within the No Disturb Zone or the wetland resource area. Tofino and Northern or the Board of the Condominium Association, as the case may be, shall contract with a qualified person, approved by the Conservation Commission, to annually inspect the 35-foot No Disturb Zone. This person shall provide to Tofino and Northern or the Board of the Condominium Association as the case may be and to the Conservation Commission an annual inspection report of (1) the integrity of the permanent markers, (2) the condition of the No Disturb Zone, including, but not limited to, any encroachment, erosion, destruction of vegetation, dumping of waste of any kind, including lawn clippings and other yard waste, and (3) whether any restoration is required. This report shall be submitted to the Conservation Commission by September 1 of each year. -~- draft Restrictions and Covenants 3-9-2009.doc ~~ n Tofino and Northern or the Board of the Condominium Association, as the case may be, is solely responsible for the cost of the annual inspection and report, as well as any restoration deemed required by the Northampton Conservation Commission. The City of Northampton is hereby granted an easement to (a) inspect the 35-Foot No Disturb Zone and (b) to perform any necessary maintenance and/or restoration obligations of Tofino and Northern or the Board of the Condominium Association, as the case may be, if the City has notified the responsible party in writing that specified maintenance and/or restoration obligations must be performed by a date certain and either Tofino and Northern or the Board of the Condominium Association has failed to perform such maintenance and/or restoration obligations by such date. COMMON OPEN SPACE Tofino and Northern and the Board of the Condominium Association are forbidden by Condition ## of the Order of Conditions to use any lawn chemicals on the site. An annual acknowledgement of this requirement by either Tofino and Northern or the Board of the Condominium Association shall be provided to the Conservation Commission by September 1 of each year. The Common areas and any lawn in the Exclusive Use Areas, will be maintained by the Condominium Association. All landscaping debris will either be mulched or disposed of off site. There shall be no work or dumping allowed in the 35-Foot Wetland Buffer No Disturb Zone. There shall be no structures erected in the said zone, and there shall be no structures built in the common areas without the written approval of the Condominium Association. EASEMENTS Access and maintenance easement for detention basin, stormwater system, common open space, 35-Foot NDZ, etc..... ESCROW ACCOUNT Tofino and Northern or the Board of the Condominium Association shall deposit $5,000.00 in an interest-bearing Escrow Account to assure that Tofino and Northern and the Board of the Condominium Association complies fully with its obligations under the Planning Board Decision, the Conservation Commission Order of Conditions, the stormwater Management Plan, and the 35-Foot Wetland Buffer No Disturb Zone. The City of Northampton (the "City") shall be a co-signer on the account. The funds in the Escrow Account shall be owned by the Condominium Association and interest thereon shall be payable to the -s- draft Restrictions and Covenants 3-9-2009.doc ~~ Condominium Association once the Condominium is formed; prior to such time the funds will be owned and interest paid to Tofino and Northern. If the City has notified Tofino and Northern prior to the formation of the Condominium, and after the formation of the Condominium the Board in writing that specified maintenance, repair, and/or restoration obligations of either Tofino and Northern or the Condominium Association under this Declaration and the Planning Board Decision, the Conservation Commission Order of Conditions, the Stormwater Management Plan, and the 35-Foot Wetland Buffer No Disturb Zone must be performed by a date certain and either Tofino and Northern or the Board of the Condominium Association as the case may be has failed to perform such maintenance, repair, and/or restoration obligations by such date, the City may expend funds from the said Escrow Account to perform the specified obligations. The City may thereafter assess or bill Tofino and Northern or the Condominium Association for such expenditure in order to replenish and maintain the account at $5,000.00. Tofino and Northern or the Condominium Association as the case may be shall have ninety (90) days to pay such an assessment and may assess the Unit Owners for their proportionate share of such expenditure. If either Tofino and Northern or the Condominium Association fails to pay or reimburse the City for the expenditure within ninety (90) days, the City shall have standing and the right to file an action against either Tofino and Northern or. the Condominium Association to enforce the assessment, including the right to seek a prejudgment lien or other security for the enforcement of the assessment. ASSESSMENT COLLECTION PROCEDURES The failure of any party to abide by the provisions of this Declaration which affect the Roadway and Sidewalks, the Sewer and Water Lines, the Stormwater Management System, the 35-Foot No Disturb Zone, and the Common Open Space shall not act to forfeit that party's rights under the easements and rights granted above. However, if a Unit Owner fails to pay that Unit Owner's said proportionate share of the assessments on the date when due as stated in an assessment issued by the Board of the Condominium Association, as applicable, then such assessment shall become delinquent and shall, together with such interest thereon and the cost of collection thereof, become a continuing lien on the property which shall bind such property in the hands of the then owner(s) and his/her/its successors in record title. The personal obligation of the then owner(s) to pay such assessment, however, shall remain as his/her/its personal obligation and shall not pass to his/her/its successors in record title unless expressly assumed by them. If the delinquent assessment is not paid within thirty (30) days after the due date, the assessment shall bear interest from the date of delinquency at the rate of eighteen percent (18%) per annum, and the Board of the Condominium Association may bring an action at law against the delinquent Unit Owner or other person personally obligated to pay the same or to foreclose the lien against -9- draft Restrictions and Covenants 3-9-2009.doc ~~ the property, and there shall be added to the amount of such assessment the costs of preparing and filing the complaint in such action, and in the event a judgment is obtained, such judgment shall include interest on the assessment as above provided and a reasonable attorney's fee to be fixed by the Court together with the costs of the action. The lien of the assessments provided for herein shall be subordinated to the lien of any mortgage or mortgages now or hereafter placed upon the properties subject to the assessment. The lien provided for herein for payment of assessments may be enforced by sale at public auction of the Unit Owner's premises in accordance with the provisions of M.G.L. Chapter 183A and Chapter 254, Section 5A. The lien sought to be foreclosed shall include the aforesaid interest and legal costs and attorney's fees incurred as a result of the foreclosure proceedings. The Condominium Association Board of Directors shall establish and elect one of their members to the position of Treasurer with respect to the maintenance and repair provisions of this Declaration. Upon request, and within seven (7) days after such request, the said Treasurer shall issue, in a form recordable with the said Registry of Deeds, a Certificate indicating that a Unit Owner is current in the Unit Owner's payment of assessments or, if not, the amount which is currently owed. MISCELLANEOUS PROVISIONS The obligations of a Unit Owner under this Agreement shall continue regardless of whether he or she resides in the Owner's Unit. In order to ensure the continued maintenance, repair, and reconstruction of (Name of Street), the sidewalks, the Sewer and Sewer Lines, the Storm Water System, the 35-Foot No Disturb Zone and the Common Open Space, the rights and obligations established by this Declaration shall run with the fee simple ownership of the Units and the Units shall be conveyed together with and subject to this Declaration, as amended from time to time. The Owners of the Units may modify any portion of this Declaration by the agreement of seventy-five (75%) percent of the then current Unit Owners (with such modifications to be in writing and recorded with said Registry of Deeds) so long as such modifications do not: (a) materially interfere with: (i) the on-going maintenance of (Name of Street) and the sidewalks in a good and passable condition, (ii) the on- going maintenance of the Sewer and Water Lines in a good and fully-functioning state, or (iii) the on-going maintenance of the Storm Water System in a good and -io- draft Restrictions and Covenants 3-9-2009.doc C~ ~~ ~. i fully-functioning state, or (iv) the ongoing adherence to the 35-Foot No Disturb Zone, or (v) the ongoing maintenance of the Common Open Space; or (b) modify any provision of this Declaration which is required by the Planning Board Decision and Special Permit granted by the City of Northampton. (c). modify any provision of this Declaration which is required by the Conservation Commission Order of Conditions granted by the City of Northampton. IN WITNESS WHEREOF TOFINO ASSOCIATES, INC. and NORTHERN AVENUE HOMES, INC., has caused to be affixed hereto and this instrument to be signed and sealed by DOUGLAS A. KOHL, their President and Treasurer, this day of , 2009. TOFINO ASSOCIATES, INC. Witness Witness BY. Douglas A Kohl Its President and Treasurer NORTHERN AVENUE HOMES, INC. By Douglas A Kohl Its President and Treasurer COMMONWEALTH OF MASSACHUSETTS HAMPSHIRE COUNTY, SS. On this day of 2009, before me, the undersigned notary public, personally appeared DOUGLAS A. KOHL, as President and Treasurer of Tofino Associates, Inc. and Northern Avenue Homes, Inc., proved to me through satisfactory evidence of identification (which was my personal knowledge as to his identity) to be the person whose name is signed on the preceding or attached document, and acknowledged to me that he/she signed it voluntarily for its stated purpose. Gloria McPherson, Notary Public My commission expires: 9/4/2009. _„_ draft Restrictions and Covenants 3-9-2009.doc ~~ ~:~ ,. _. TOFINO ASSOCIATES, INC. NORTHERN AVENUE HOMES, INC. ~' (413) 25G-0321 31 Campus Plaza Road, I-ladley, MA 01035 December 3, 2008 Northampton Conservation Commission City Hall 212 Main Street Northampton, MA 01060 RE: Notice of Intent North Street Condominiums Map 25C, Parcels 12 & 17 Dear Members of the Conservation Commission, We are writing this letter outlining some mitigation options we hope to discuss with you at our hearing on December 11, with the intention of reducing the No-Encroachment Zone for our townhouse project from 35 feet from wetlands to 10 feet. We carefully sited all the townhouses, all parking, and all of the roadway except for 88 square feet, outside the 35-foot buffer. The reduction to 10 feet would apply to grading, yards for the units, detention and bioretention basins, drywells for infiltration, paths and retaining walls. Some of this reduction is within areas that are currently lawn. The discretionary reduction is written into the City Code (Section 337-10(B)) in order "to encourage infill development, which is considered more sustainable under the principles of smart growth and generally has a smaller environmental footprint than development in outlying areas." Our North Street condominium project is~a true infill project, providing an attractive residential option within easy walking distance of schools, jobs, retail establishments, restaurants and entertainment. The standards given in Section 337-10(B) of the City Code for the reduction of the No- Encroachment Zone from 35 feet to 10 feet are "extraordinary mitigation, replication, restoration or open space preservation measures." No work is being proposed in any wetland resource area, so replication is not applicable to this project. On-site open space preservation is not feasible due to the small size of the parcel. Other measures that might be taken on site include: Restoration: Removal of invasive plant species from the wetland and 100' Buffer Zone Removal of trash and surface debris from the wetland. This would not include digging out historic fill, which would potentially cause more harm than good to the wetland. Mitigation: Incorporation of Low Impact Development strategies. This project incorporates many LID strategies. For more specific information, see attachment. ~D ~~ Measures that might be taken off-site include: Mitigation: Donate money for the construction of a wetland in the cul-de-sac island at the Industrial Park. Open Space Preservation: Donate money for the purchase of Conservation Land or a Conservation Easement elsewhere in the City. Donate land elsewhere in the City for conservation purposes. We look forward to discussing our options for mitigating the impacts of development at our hearing next week. Sincerely, Douglas A. Kohl, President Tofino Associates, Inc. Northern Avenue Homes, Inc. ~, ~~ In order to mitigate the effects of development on the site, the North Street Condominium project incorporates many Low Impact Development strategies. The following Low Impact Development Strategies and information is taken directly from the Massachusetts Low Impact Development Toolkit. Notes regarding the incorporation of the strategy into the project are provided in red. LID Site Design Reduce Site Coverage: In order to reduce site coverage but not square footage, site development layouts may include buildings clustered together, parking structures (instead of lots), or taller buildings with a smaller footprint relative to floor area. The project clusters units into blocks of townhouses, 3-stories tall. The units themselves have a modest footprint and 10 out of 25 units have a reduced footprint, thereby reducing lot coverage. Sensitive site landscaping: Ecological landscaping strategies seek to minimize the amount of lawn area and enhance the property with native, drought-resistant species; as a result, property owners use less water, pesticides, and fertilizers. The maintenance of vegetated buffers along waterways can also enhance the site and help protect water quality. Back and side yards are minimal. We are willing to do some native plantings between the yards and the wetlands. The limit of work line leaves, at its closest point in the southwest corner of the site, 85 feet of undisturbed vegetation between the grading for the detention basin and the intermittent stream. In other areas, there is over 200 feet of undisturbed vegetation. Create a Decentralized stormwater System: The actual location of buildings and the alignment of roadways should be determined in conjunction with the design of the stormwater management system. The goal of this process is to minimize "directly connected impervious area"-those impervious areas that drain directly into apipe-and-pond stormwater system. Designers should seek to maintain or create small sub-watersheds on the site and "micromanage" the runoff from these sub-watersheds in small decentralized structures, such as swales, bioretention areas, infiltration structures, and filter strips. Paved surfaces should be graded and crowned so that they form multiple "mini-watersheds;" the runoff from each small drainage area should to a different bioretention area, Swale, or filter strip. Roof runoff should be sent to rain barrels, cisterns, dry wells, and vegetated areas via level spreaders. There are 8sub-watersheds proposed, and a variety of conveyance, treatment, and runoff reduction systems are used in appropriate areas: swales, curb cuts, a bioretention area, catch basins, a proprietary treatment chamber, infiltration trench, infiltration basin, and a detention basin. Dry wells are located adjacent to proposed buildings in order to infiltrate the roof area where possible. Maximize tl~e travel time for stormwater runoff.' Conventional pipe systems increase the speed of stormwater runoff, resulting in bigger peak discharge rates (and therefore bigger ponds) at the end of the pipe. In contrast, LID seeks to increase the time of concentration (the average travel time for rainfall) through a variety of techniques: retain stormwater in small structures close to the source (described above), provide as much overland or sheet flow as possible, use open drainage systems, provide long travel paths, and use vegetation to increase surface roughness. Where possible roof water is directed into either an adjacent (approx. 10 ft away) infiltration trench or dry well where it is retained and infiltrated before overflowing to either the wetland area or to a ~~ n larger basin. The dry wells are designed to overflow to the grass yards (reducing time of concentration) toward the wetlands in a situation where the dry well's volume capacity is exceeded. LID stormwater structures: Bioretention areas and infiltration trenches should be sized to treat the stormwater from frequent, low intensity storms for water quality and infiltrate it into the ground or slowly release it; they should not be expected to completely manage the peak discharge rate or volume from large storms. Volume and rate controls at the downstream end of the site may still be necessary, but much smaller as a result of LID site design, decentralized stormwater management, and long travel paths. This is true in the stormwater design. The use of a bioretention area and infiltration trenches has reduced the size of the detention basins. Infiltration systems are proposed in all areas where groundwater levels permit infiltration. There are a total of 6 infiltration systems which help absorb runoff to the maximum extent possible rather than relying solely on the detention basin for runoff control (note that in the HydroCAD calculations, infiltration was not included in order to provide a more conservative runoff rate). Roadways and Parking Areas Roadway width: Excessively wide streets are the greatest source of impervious cover (and stormwater runoff) in most residential developments. Some local codes require streets up to 40 feet wide in subdivisions with only a dozen houses. These inappropriate standards result from blanket application of high volume/high speed road design criteria, overestimates of on-street parking demand, and the perception that wide streets result in faster emergency response times. Narrower road sections and alternative road profiles can reduce stormwater runoff and mitigate its impacts, while still allowing safe travel, emergency vehicle access, and adequate parking. For most low-traffic roads, a 24' road width is sufficient to accommodate two way traffic, and even narrower widths should be used in very low traffic conditions (e.g., a six-lot subdivision.) The National Fire Protection Administration Uniform Fire Code (2003) recommends a minimum unobstructed width of just 20 feet, with the recognition that local authorities set lower standards if turnouts or alternate exits are available. Two-way road widths are reduced to 20 feet, and cone-way loop through the project is used to reduce pavement width to 14 feet in front of units 8-13, and 12 feet at the existing R-O-W heading out of the development. Roadway Profile: Curbs and gutters concentrate stormwater runoff and increase its velocity, impeding decentralized treatment and infiltration. LID strategies recommend open-section roadways flanked by filter strips and swales instead of curbs and gutters. These LID techniques, built on the model of "country drainage," help to filter roadway runoff, promote infiltration, and reduce runoff velocity, resulting in lower peak discharge rates. If properly designed, open section roadways will be no more prone to flooding than conventional roadway profiles. If curbs are deemed necessary to stabilize the roadway edge, the design can use invisible curbs (same level as the road surface), periodic curb cuts, or perforated curbs to allow stormwater to run off the roadway edge. This strategy, the "country drainage model," is not suited to the site because of both land constraints and the urban nature of the project. It may be possible that some additional curb cuts can be added in certain locations to allow more water to sheetflow, or to flow through filter strips. ~) ~~ Roadway layout: The location and layout of roadways can also be modified to improve post- development hydrology. Roadways should be placed to avoid crossing steep slopes where significant cut and fill will be required. They should run parallel to contours on gentle slopes and perpendicular to contours on steeper slopes. Design of a roadway network may involve some give and take between reducing total roadway length and road layouts compatible with existing topography. On low-speed streets, clearing and grading should be limited to a small strip of land (5') on either side of the roadway and sidewalk. The roadways follow the topography of the site. There are no extreme cuts and fills on the site Turnarounds and Cul-de-Sacs: Reducing the radius of a cul-de-sac from 40 feet to 30 feet yields a 45% reduction in paved surface (5,000 sq. ft versus 2,800 sq. ft.) A T-shaped hammerhead occupies even less space but still provides sufficient room for turning vehicles and fire trucks (though it may require a 3-point turn.) Depending on the length of the street, designers should consider cone-way loop road with parking on one side. Turnarounds are minimally sized and make use of adjacent parking spaces instead of adding more pavement for a full hammerhead-type turnaround. Parking Lots: Expansive parking lots that drain to just a few catch basins create large volumes and high velocities that require the use ofpipe-and-pond stormwater techniques. The LID approach encourages designers to create multiple smaller parking lots separated by natural vegetation and, bioretention areas. On hilly sites, the creation of multiple parking areas at different elevations can reduce the amount of grading necessary and preserve natural hydrology. Other strategies include reducing the total number of parking spaces and reducing the size of some parking spaces.. The project design minimizes the use of parking areas by providing garages and just enough space in the driveway to park a second car. There is minimal guest parking scattered throughout the site. Bioretention Bioretention is an important technique that uses soil, plants and microbes to treat stormwater before it is infiltrated or discharged. Bioretention "cells" are shallow depressions filled vvith sandy soil, topped with a thick layer of mulch, and planted with dense vegetation. stormwater runoff flows into the cell and slowly percolates through the soil (which acts as a filter) and into the groundwater; some of the water is also taken up by the plants. Bioretention areas are usually designed to allow ponded water 6-8 inches deep, with an overflow outlet to prevent flooding during heavy storms. Where soils are tight or fast drainage is desired, designers may use a perforated underdrain, connected to the storm drain system. In very permeable soils, some bioretention areas can be designed as "off-line" treatment structures (no overflow necessary), but in most situations they will be an "on-line" component of the stormwater management system, connected to downstream treatment structures through an overflow outlet or an overflow drop inlet installed at the ponding depth and routed to the site's stormwater management system. Ideally, overflow outlets should be located as far as possible from runoff inlets to maximize residence time and treatment. The project incorporates a bioretention area with suitable pretreatment (stone gutter and sod strip) in place of conventional stormwater treatment chambers. The bioretention basin is designed with an overflow outlet into the large detention basin. Filter Strips ~~ __, ,~ Grass filter strips are low-angle vegetated slopes designed to treat sheet flow runoff from adjacent impervious areas. Filter strips (also known as vegetated filter strips and grassed filters) function by slowing runoff velocities, filtering out sediment and other pollutants, and providing some infiltration into underlying soils. Because they use sheet flow and not channelized flow, filter strips are often more effective than swales at removing suspended solids and trash from runoff. They provide good "pretreatment" of stormwater that will then be routed to another technique such as a bioretention area. They cost significantly less than "hardscaped" stormwater infrastructure and also provide a convenient and effective area for snow storage and treatment. The current proposed design includes a stone gutter and sod pretreatment system after the curb break located adjacent to the bioretention area, which utilizes a similar theory for runoff pretreatment as the vegetated filter strip. Infiltration Trenches and Drywells Infiltration trenches and dry wells are standard stormwater management structures that can play an important role in Low Impact Development site design. Dispersed around the site, these infiltration structures can recharge groundwater and help to maintain or restore the site's natural hydrology. This approach contrasts with conventional stormwater management strategies, which employ infiltration as a secondary strategy that occurs in large basins at the end of a pipe. Dry wells and infiltration trenches store water in the void space between crushed stone or gravel; the water slowly percolates downward into the subsoil. An overflow outlet is needed for runoff from large storms that cannot be fully infiltrated by the trench or dry well. Infiltration trenches do not have the aesthetic or water quality benefits of bioretention areas, but they may be useful techniques where bioretention cells are not feasible. The project incorporates an infiltration trench behind units 14 and 15, aswell as drywells to infiltrate roof runoff from most of the dwelling units, all of which include overflow outlets. The bioretention basin on site is utilized for water quality treatment. Cisterns and Rain barrels Cisterns and rain barrels are simple techniques. to store rooftop runoff for reuse for landscaping and other nonpotable uses. They are based on the LID approach that treats rooftop runoff as a resource that should be reused or infiltrated. In contrast, conventional stormwater management strategies take rooftop runoff, which is often relatively free of pollutants, and send it into the stormwater treatment system along with runoff from paved areas. The most common approach to roof runoff storage involves directing each downspout to a 55- gallon rain barrel. A hose is attached to a faucet at the bottom of the barrel and water is distributed by gravity pressure. Amore sophisticated and effective technique is to route multiple downspouts to a partially or fully buried cistern with an electric pump for distribution. Where site designs permit, cisterns may be quite large, and shared by multiple households, achieving economies of scale. Stored rain water can be used for lawn irrigation, vegetable and flower gardens, houseplants, car washing, and cleaning windows. When rain barrels or cisterns are full, rooftop runoff should be directed to drywells, stormwater planters, or bioretention areas where it will be infiltrated. A large underground cistern is not feasible due to groundwater. We are willing to entertain the idea of providing rain barrels to collect roof runoff, but ultimately it will be up to the individual unit owners whether they want to continue the practice over time. It might make more sense to infiltrate as much roof runoff as possible, as the plan does. MEMORANDUM TO: Francis Johnson, Chair, Planning Board FR: James R. Latuila, P.E., City Engineer, DA: December 5, 2008 RE: File: North Street - 25-Unit Townhouse Condominium Development on Private Ways Map ID: 25C -12 &17 CC: file The Department of Public Worlcs has reviewed the above referenced application for the following items: Traffic: Utilities: x Volume & Impact on City Street x Sanitary Sewer x Roadway Capacity x Water x Adequacy of City Road Constriction x Drauiage Into City Stormwater System x Site Distances x Capacity of Stonnwater Line x Parking x Northampton Stoi7nwater Permit x Driveway Openings NPDES Phase II Compliance x Other: Private vs. Public Ownership The Department of Public Worlcs has the following comments: No Concei7zs, project will not have an impact on any items reviewed Traffic Study is required Roadway does not have adequate capacity to handle the additional traffic Roadway is not adequately constructed to handle proposed increase in traffic Site Distances are not adequate for proposed project Parking spaces do not meet minhnum requirements Parking spaces are too close to driveway opening Driveway opeiungs are not adequate for proposed use .Sanitary Sewer line is not adequately sized for proposed use x Sewer line comlection is not properly shown -see below Water line is not adequately sized for proposed use x Water line coimection is not properly shown -see below City stonnwater system is not adequate to haizdle increase in drainage Stormwater system does not meet nuninnun requirements for reduction of Total Suspended Solids (TSS) Northampton Stoi7nwater Management Pei7nit has not been approved or conditions for approved pei7nit have not been met Other Comments: General The DPW is reviewing these plans under the assumption that this proposed development and its associated ways are private and will remain private as indicated in the application narrative. North Street Condos_ SpPerm_Sicc PB.doc P1gc I of 3 ~ 1 • If the project is approved, there should be a specific condition in the PB decision requiring that the proposed ways remain private. The City currently plows View Ave. even though it is private. City plowing will be discontinued at an appropriate point if the project is approved and built. • IIow does the applicant propose to resolve the issue of access to and maintenance of exiting public water sewer services in View Ave.? See DPW proposal under Water and Sewer below. • To enstue quality constriction of proposed infrastruchue, the DPW requests privatized project inspection and control as outlined in Section 290-59 of the Subdivision regulations. Stormwater • The pei7nit application is being reviewed, but continents are contingent on the results of Conservation Commission review and determinations. Water • The 4" water line on View Ave. as shown on L1 is in service and there are tluee existing house services coimected to it: 154 North Street, 1 View Ave and 8 View Ave. 8 View Ave will be demolished if the project moves forward. 154 North and 1 View will need to be comiected to the proposed 8" main as well as remauz in service tluoughout constriction. The applicant will need to provide easements to the City for access and maintenance to these service coimections. • The hydrant on North Street near View Ave. coiuzects to the 4" water line on View, not the 6" line on North as shown. A new lrydrant stub off of North Street will be installed by the DPW in conjtmction with the re-paving of North Street in 2009. If the project advances, the existing hydrant on the comer of North St and View can be abandoned once a new hydrant is installed off the new stub on North Street. • An additional hydrant and valve shall be installed on View Ave. between the proposed isolation valves. • lilstall an 8x8x8 Tee at the proposed intercoiulection of the new main to North St at View Ave. Move the isolation valve to the View Ave property lute. • Install an 8x8x8 Tee at the proposed intercomlection of the new main to North St at the ROW. Move the isolation valve to the ROW property line. Install an 8" gate valve along the North Street main on the SW side of the uztercomzection and 2-8x6 reducers to the 6" main. • Curb stops for Units 1 & 2 shall be at the property line. • Service taps shall have at least a 5' separation along the water main. • The water maul on Northei7z Ave. is 8" AC. There is an existing 3/4" copper service tap extending into the Toffino property that can possibly be utilized. Sewer The existing sewer services to 1 and 8 View Avenue and 154 North Street need to be shown. It is believed that services for all tluee dwe11u1gs connect to the North Street main via View Ave. The applicant will need to provide easements to the City for access and maintenance to the existuig gravity sewer laterals that are to remain. Move SMH at View Ave/North St. to property line. Force main enhy alto this SMH shall be by exterior chumley to the flow line at the base of manhole as shown on attached DPW detail. North Street Condos_ spPcrm_site PB.doc Page 2 of 3 i I i\ • Sewer main depth at end of Northei7i Ave. is very shallow (less than 3 feet). The applicant shall provide force mains front Units 1&2 that discharge to exterior chinuzeys at the SMII per the attached detail. The applicant shall also show prof le and details demonstrating adequate cover and method of protection from freezing during cold weather. Roadway and Sidewalks • DPW suggests that graiute curb be provided on the northeast side if View Ave. to be consistent with the remainder of the project. • The bituminous roadway should have a miiuiniun 2" base course and 2" top course to be consistent with. The applicant should provide concrete sidewalks consistent with subdivision material standards. If bituminous sidewalks are approved they should have 1.5" base coLUSe and 1.5" top course per DPW standard. Details • Water/sewer crossing detail(s) need to be provided. All such crossings shall meet D]/P vertical and horizontal separation requirements. • Add exterior chinuley drop detail for force main entry into gravity SMH as provided by DPW. • • Sewer Cleanout MH detail should indicate 2", 2.5" or, 3" as force mahz possibilities since size transitions occur within these stiuctiues. North street Condos_ spPerm_Site PB.doc P1gc 3 of 3 ~~ ~\ / TOFINO ASSOCIATES, INC. NORTHERN AVENUE HOIIAES, INC. ® ® ® ® ® (413) 256-0321 31 Campus Plaza Road, Hadley, MA 01035 January 16, 2009 Northampton Conservation Commission City Hall 212 Main Street Northampton, MA 01060 RE: Revised Plans Notice of Intent North Street Condominiums Map 25C, Parcels 12 & 17 Dear Members of the Conservation Commission, Enclosed please find revised plans (Sheets L2 and L3) for our North Street Condominium project. Because the plan now includes restoration work within wetlands on site, we have also included a revised WPA Form 3 (Notice of Intent), and an additional payment of $55, the City's share of the fee for a Category 1 Resource Improvement. The plans were revised based on comments received from the Commission and staff at the public hearing on December 11, 2008. The amount of work that was originally proposed within the 10'-35' buffer zone has been significantly reduced. Specifically: • The large detention basin behind units 22-25 and its outfall have been relocated outside the 35' buffer. • The grading for the large detention basin is almosf.entirely outside the 35' buffer. A portion of the grading that connects the bioretention basin with the detention basin remains within the 35' buffer. • The small detention basin adjacent to unit 3, its associated piping and outfall have been eliminated. • Drywells behind units 3-13 have been moved outside the 35' buffer and grading behind these units has been pulled back significantly. We are also proposing on-site mitigation that improve the condition of the buffer zone and extraordinary mitigation to restore, expand and enhance the wetlands: • Invasive plants within the buffer zone will be removed, and the buffer will be restored with plantings of native species with high wildlife value. • Side slopes of the detention basin behind units 22-25 will be planted for increased wildlife habitat value. ~ ~~ • The significant stand of Japanese Knotweed in the buffer zone behihd units 11-13 will be removed and the buffer restored. This will entail cutting.the knotweed, and a licensed ~~ applicator dripping herbicide into the cut stems. This protocol will continue over the course of a year, to make sure the knotweed is killed. The disturbed area will then be restored with densely planted native shrubs to provide shade to prevent the reemergence of knotweed. A bio-retention basin will replace the originally proposed detention basin adjacent to unit 3, for greater infiltration and improved water quality (90%TSS removal, which is beyond the 80% required by the DEP). The basin itself is outside the 35' buffer; grading for the basin is 30' from the wetland at its closest point. The outlet pipe is located under the existing path, and ends 15' from the wetland. The existing path will be re-aligned in that area to be further from the wetland, and the trench for the pipe will be restored with native plantings. The side slopes of the bio-retention basin will also be planted with native species to improve the habitat value of the buffer zone. • A second bio-retention basin is located between unit 13 and unit 25. This was part of the original proposal. This bio-retention basin also infiltrates and achieves 90%TSS removal. The majority of the structure is located on existing lawn within the 35' buffer. The side slopes will be planted with native species for habitat value and will be an improvement over the existing lawn. • Trash and surface debris will be removed from the entire wetland. Rosa multiflora growing spectacularly well within the wetland behind units 12 and 13 will be removed and the wetland restored. The multiflora rose will be cut down and herbicide will be applied by a licensed applicator. It will be monitored for one year, any re-emergence being similarly treated. The disturbed wetland will then be restored with densely planted wetland shrubs to provide shade to prevent the reemergence of multiflora rose. The area of this wetland restoration is 1,588 square feet. • The path between the rail trail and the proposed construction will be re-aligned to get it out of the wetland. It currently crosses 2 areas of wetland, which will be restored by removing any pieces of asphalt paving, de-compacting the soil and replanting with native wetland plant species. The total area of this wetland restoration is 552 square feet. • New wetland will be constructed to enlarge the area of restored wetland in the area of the path re-alignment. The area of this constructed wetland is 860 square feet. • New wetland will be constructed to enlarge the area of wetland to the northwest of the detention basin. The area of this constructed wetland is 2,800 square feet. We look forward to discussing our new plans and proposals for mitigating the impacts of development at our hearing next week. Sincerely, ~) D glas A. Kohl, President To ino Associates, Inc. Northern Avenue Homes, Inc. ~- r; ~ Massachusetts Department of Environmental Protection Bureau of Resource Protection -Wetlands WPA Form 3 -Notice of Intent Massachusetts Wetlands Protection Act M.G:L. c. 131, §40 Important: When filling out forms on the computer, use only the tab key to move your cursor - do not use the return key.. reb rencn ~,~v i s~~ Provided by MassDEP: `246-0625 __ • MassDEP File Numbe r Document Transaction ~Jurnber Northampton City/Town A. General Information 1. Project Location (Note: electronic filers will click on button to locate project site): Northern Avenue Northampton 01060 a. Street Address b. City/Town c. Zip Code Latitude and Longitude: 25C f. Assessors Map/Plat Number 2. Applicant: d. Latitude 12&17 e. Longitude g. Parcel /Lot Number a. First Name b. Last Name Note: Tofino Associates, Inc. and Northern Avenue Homes, Inc. Before c. Organization completing this 31 Campus Plaza Road form consult your local d. Street Address Conservation Hadley MA 01035 Commission regarding any e. City/Town f. State g. Zip Code municipal bylaw 413) 256-0321 ~ (413) 256-0130 glm@kohlconstruction.com or ordinance. h. Phone Number i. Fax Number j. Email Address 3. Property owner (required if different from applicant): ^ Check if more than one owner a. First Name b. Last Name c. Organization d. Street Address e. City/Town f. State g. Zip Code h. Phone Number i. Fax Number j. Email address 4. Representative (if any): a. First Name b. Last Name c. Company d. Street Address e. City/Town f. State g. Zip Code h. Phone Number i. Fax Number j. Email address 5. Total WPA Fee Paid (from NOI Wetland Fee Transmittal Form): $5,250 $2,612.50 $2,637.50 + $100.00 local fee a. Total Fee Paid b. State Fee Paid c. City/Town Fee Paid vvpaform3.doc • rev. 02/21/08 Page 1 of 8 n ~. ~ ~~ . Massachusetts Department of Environmental Protection Bureau of Resource Protection -Wetlands WPA -Form 3 -Notice of Intent. Massachusetts Wetlands Protection Act M.G.L. c..131, §40 ~.~v~ s~~ Provided by M~ DE~P: _246-0625 MassDEP File Number Document Transaction Numbet' Northampton Ciry/Town A. General Information (continued) 6. General Project Description: The proposed project consists of a duplex on Northern Avenue and 23 townhouse condominiums off North Street, for a total of 25 new dwelling units, with associated stormwater management, site, utility and road work. A portion of the project falls within the Buffer Zone of BVW. No alteration of any resource area is proposed. 7a. Project Type Checklist: 1. ^ Single Family Home 2. ® Residential Subdivision 3. ^ Limited Project Driveway Crossing 4. ^ Commercial/Industrial 5. ^ Dock/Pier 6. ^ Utilities 7. ^ Coastal Engineering Structure 8. ^ Agriculture (e.g., cranberries, forestry) 9. ^ Transportation 10. ^ Other 7b. Is any portion of the proposed activity eligible to be treated as a limited project subject to 310 CMR 10.24 (coastal) or 310 CMR 10.53 (inland)? 1. ^ Yes ® No If yes, describe which limited project applies to this project: 2. Limited Project 8. Property recorded at the Registry of Deeds for: Hampshire a. County Book 8428, Page 219 c. Book and Page b. Certificate # (if registered land) Book 8829, Page 341 d. Book and Page B. Buffer Zone & Resource Area Impacts (temporary & permanent) 1. ^ Buffer Zone Only -Check if the project is located only in the Buffer Zone of a Bordering Vegetated Wetland, Inland Bank, or Coastal Resource Area. 2. ^ Inland Resource Areas (see 310 CMR 10.54-10.58; if not applicable, go to Section 6.3, Coastal Resource Areas). Check all that apply below. Attach narrative and any supporting documentation describing how the project will meet all performance standards for each of the resource areas altered, including standards requiring consideration of alternative project design or location. For all projects affecting other Resource Area Size of Proposed Alteration Proposed Replacement (if any j Resource Areas, _ please attach a a. ^ Bank narrative 1. linear feet 2. linear feet explaining how b. ^ Bordering Vegetated the resource area was Wetland 1. square feet 2. square feet delineated. c. ^ Land Under Waterbodies grid 1. linear feet 2. linear feet Waterways 3. cubic yards dredged wpaform3.doc • rev. 02/21/08 Page 2 of 8 ~~ ~ ~ ~ ~~ ~ ~,~v ~ s~~ Massachusetts Department of Environmental Protection ,Fro:-iaea by MassDEf': Bureau of Resource Protection -Wetlands 246-o62s ___ MassDEP File Number WPA Form 3 -Notice of Intent Document Transaction Number: Massachusetts Wetlands Protection Act M.G,L. c. 131, §40 • Northampton City/Town 6. Buffer Zone & Resource Area Impacts (temporary & permanent) (cont'd) Resource Area Size of Proposed Alteration Proposed Replacement (if any, d. ^ Bordering Land Subject to Flooding 1. square feet 2. square feet 3. cubic feet of flood storage lost 4. cubic feet replaced e. ^ Isolated Land Subject to Flooding 1. square feet 2. cubic feet of flood storage lost 3. cubic feet replaced f. ^ RlVerfrOnt Area 1. Name of Waterway (if available) . 2. Width of Riverfront Area (check one): ^ 25 ft. -Designated Densely Developed Areas only ^ 100 ft. -New agricultural projects only ^ 200 ft. -All other projects 3. Total area of Riverfront Area on the site of the proposed project: square feet 4. Proposed alteration of the Riverfront Area: a. total square feet b. square feet within 100 ft. c. square feet between 100 ft. and 200 ft. s. Has an alternatives analysis been done and is it attached to this NOI? ^ Yes ^ No s. Was the lot where the activity is proposed created prior to August 1, 1996? ^ Yes ^ No 3. ^ Coastal Resource Areas: (See 310 CMR 10.25-10.35) Online Users: Include your document. transaction number (provided on your receipt page) with all supplementary information you submit to the Department. Check all that apply below. Attach narrative and supporting documentation describing how the project will meet all performance standards for each of the resource areas altered, including standards requiring consideration of alternative project design or location. Resource Area Size of Proposed Alteration Proposed Replacement (if anvl a. ^ Designated Port Areas Indicate size under Land Under the Ocean, below b. ^ Land Under the Ocean c. ^ Barrier Beach d. ^ Coastal Beaches e. ^ Coastal Dunes wpaform3.doc • rev. 02/21/08 1. square feet 2, cubic yards dredged Indicate size under Coastal Beaches and/or Coastal Dunes below 1. square feet 2. cubic yards beach nourishment 1. square feet 2. cubic yards dune nourishment Page 3 of 8 Massachusetts Department of Environmental Protection Provided by MassDEP Bureau of Resource Protection -Wetlands 246-0625 MassDEP Pile Nunibcr WPA Form 3 -Notice of Intent Document Transaction Number Massachusetts Wetlands Protection Act M.G.L. c, 131, §40 Northampton City/Town B. Buffer Zone & Resource Area Impacts (temporary & permanent) (cont'd) Size of Proposed Alteration Proposed Replacement (if any f. ^ Coastal Banks 1. linear feet g. ^ Rocky Intertidal ShOreS 1. square feet h. ^ Salt Marshes 1. square feet 2. sq ft restoration, rehab., creation i. ^ Land Under Salt POndS 1. square feet 2. cubic yards dredged . ~. ^ Land Containing Shellfish 1. square feet ' k. ^ Fish Runs Indicate size under Coastal Banks, inland Bank, Land Under the Ocean, and/or inland Land Under Waterbodies and Waterways, above 1. cubic yards dredged I. ^ Land Subject to Coastal Storm Flowage 1. square feet 4. ® Restoration/Enhancement If the project is for the purpose of restoring or enhancing a wetland resource area in addition to the square footage that has been entered in Section 6.2.b or B.3.h above, please enter the additional amount here. 2,140 a. square feet of BVW b, square feet of Salt Marsh C. Other Applicable Standards and Requirements Streamlined Massachusetts Endangered Species Act/VVetlands Protection Act Review 1. Is any portion of the proposed project located in Estimated Habitat of Rare Wildlife as indicated on the most recent Estimated Habitat Map of State-Listed Rare Wetland Wildlife published by the Natural Heritage and Endangered Species Program (NHESP)? To view habitat maps, see the Massachusetts Natural Heritage Atlas or go to http://www.mass.qov/dfwele/dfw/nhesp/nhregmap htm. a. ^ Yes ® No If yes, include proof of mailing or hand delivery of NOI to: Natural Heritage and Endangered Species Program Division of Fisheries and Wildlife 2008 (MassGIS) Route 135, North Drive b. Date of map Westborough, MA 01581 If yes, the project is also subject to Massachusetts Endangered Species Act (MESA) review (321 CMR 10.18). To qualify for a streamlined, 30-day, MESA/Wetlands Protection Act review, please complete-Section C.1 .C, and include requested materials with this Notice of Intent (NOI); OR complete Section C.1.d, if applicable. If MESA supplemental information is not included with the NOI, by completing Section 1 of this form, the NHESP will require a separate MESA filing which may take up to 90 days to review (unless noted exceptions in Section 2 apply, see below). wpaform3.doc • rev. 02/21/08 Page 4 of 8 ~~ ~~ ~ ~.~v~ see .. _. Massachusetts Department of Environmental Protection Provided by MassDEP: Bureau of Resource Protection -Wetlands ~ 246-0625 . _ MassDEP File Nirmher ~~~ WPA ~FOrm 3 - Notice of Intent Document Transaction Number< Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Northampton City/Town C. Other Applicable. Standards and Requirements (cont'd) 1. c. Submit Supplemental Information for Endangered Species Review 1. ^ Percentage/acreage of property to be altered: (a) within wetland.Resource Area percentage/acreage (b) outside Resource Area percentage/acreage 2. ^ Assessor's Map or right-of-way plan of site 3. ^ Project plans for entire project site, including wetland resource areas and areas outside of wetlands jurisdiction, showing existing and proposed conditions, existing and proposed tree/vegetation clearing line, and clearly demarcated limits of work ** (a) ^ Project description (including description of impacts outside of wetland resource area & buffer zone) (b) ^ Photographs representative of the site (c) ^ MESA filing fee (fee information available at: http://www.mass.gov/dfwele/dfw/nhesp/nhenvmesa htm) Make check payable to "Natural Heritage 8~ Endangered Species Fund" and mail to NHESP at above address Projects altering 10 or more acres of land, also submit: (d) ^ Vegetation cover type map of site (e) ^ Project plans showing Priority & Estimated Habitat boundaries d. OR Check One of the Following 1. ^ Project is exempt from MESA review. Attach applicant letter indicating which MESA exemption applies. (See 321 CMR 10.14, http://www.mass.oov/dfwele/dfw/nhesp/nhenvexemgtions htm; the NOI must still be sent to NHESP if the project is within estimated habitat pursuant to 310 CMR 10.37 and 10.59.) 2. ^ Separate MESA review ongoing. a. NHESP Tracking Number b. Date submitted to NHESP s. ^ Separate MESA review completed. Include copy of NHESP "no Take" determination or valid Conservation & Management Permit with approved plan. Some projects not in Estimated Habitat may be located in Priority Habitat, and require NHESP review (see www.nhesp.org regulatory review tab). Priority Habitat jncludes habitat for state- listed plants and strictly upland species not protected by the Wetlands Protection Act. i`* MESA projects may not be segmented (321 CMR 10.16). The applicant must disclose full development plans even if such plans are not required as part of the Notice of Intent process: wpaform3.doc • rev. 02/21/08 Page 5 of 8 .. ~~ ~ ~ ~ ) ~, ~C V l 5~ ~~ Massachusetts Department of Environmental Protection 'Provided by MassDEi?: Bureau of Resource Protection -Wetlands 246-0625 __ • MassDEP File Number WPA Form 3 -Notice of Intelnt Document Transacfi~'t Number Massachusetts Wetlands Protection Act M.G.L.. c. 131, §40 Northampton . City/rown C. Other Applicable Standards and Requirements (cont'd) 2. For coastal projects only, is any portion of the proposed project located below the mean high water line or in a fish run? a. ® Not applicable -project is in inland resource area only b. ^ Yes. ^ No If yes, include proof of mailing or hand delivery of NOI to either: South Shore - Cohasset to Rhode North Shore -Hull to New Hampshire: Island, and the Cape & Islands: Division of Marine Fisheries - Division of Marine Fisheries - North Shore Office Southeast Marine Fisheries Station Attn: Environmental Reviewer Attn: Environmental Reviewer 30 Emerson Avenue 838 South Rodney French Blvd. Gloucester, MA 01930 New Bedford, MA 02744 Also if yes, the project may require a Chapter 91 license. For coastal towns in the Northeast Region, please contact MassDEP's Boston Office. For coastal towns in the Southeast Region, please contact MassDEP's Southeast Regional Office. . 3. Is any portion of the proposed project within an Area of Critical Environmental Concern (ACEC)? Online Users: a. ^ Yes ® No If yes, provide name of ACEC (see instructions to WPA Form 3 or MassDEP Include your Website for ACEC locations). Note: electronic filers click on Website. document transaction b. ACEC number (provided on 4. Is any portion of the proposed project within an area designated as an Outstanding Resource Water` , your receipt (ORW) as designated in the Massachusetts Surface Water Quality Standards, 314 CMR 4:00? page) with all supplementary a. ^ Y2S ® NO information you submit to the 5. Is any portion of the site subject to a Wetlands Restriction Order under the Inland Wetlands department. Restriction Act (M.G.L. c. 131, § 40A) or the Coastal Wetlands Restriction Act (M.G.L. c. 130, § 105)? a. ^ Yes ® No 6. Is this project subject to provisions of the MassDEP Stormwater Management Standards? a. ® Yes. Attach a copy of the Stormwater Report as required by the Stormwater Management Standards per 310 CMR 10.05(6)(k)-(q) and, check if: 1. ^ Applying for Low Impact Development (LID) site design credits (as described in Stormwater Management Handbook Vol. 2, Chapter 3) 2. ^ A portion of the site constitutes redevelopment 3. ^ Proprietary BMPs are included in the Stormwater Management System. b. ^ No. Check why the project is exempt: 1. ^ Single-family house 2. ^ Emergency road repair _3. ^ . Small Residential Subdivision (less than or equal to 4single-family houses or less than or equal to 4 units in multi-family housing project) with no discharge to Critical Areas. wpaform3.doc • rev. 02/21/08 Page 6 of 8 ~l ,~~ ~ > Massachusetts Department of Environmental Protection Bureau of Resource Protection -Wetlands WPA -Form 3 -Notice of Intent Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 ~2.~~C1 S~C~ Provided by MassDEP: '`246-0625 _ MassDEP File Number Document Transaction.'Number Northampton City/Town D. Additional Information Applicants must include the following with this Notice of Intent (NOI). See instructions for details: Online Users: Attach the document transaction number (provided on your receipt page) for any of the following information you submit to the Department. ~. 1. ® USGS or other ma.p of the area (along with a narrative description, if necessary) containing sufficient information for the Conservation Commission and the Department to locate the site. (Electronic filers may omit this item.) 2. ® Plans identifying the location of proposed activities (including activities proposed to serve as a Bordering Vegetated Wetland [BVW] replication area or other mitigating measure) relative to the boundaries of each affected resource area. 3. ® Identify the method for BVW and other resource area boundary delineations (MassDEP BVW . Field Data Form(s), Determination of Applicability, Order of Resource Area Delineation, etc.), . and attach documentation of the methodology. a. ® List the titles and dates for all plans and other materials submitted with this NOI. Notice of Intent Plans for North Street Condominiums, sheets L1-5, EC1 a. Plan Title The Berkshire Design Group Mark Darnold b. Prepared By c. Signed and Stamped by 01.15.09 varies d. Final Revision Date e. Scale f. Additional Plan or Document Title g. Date s. ^ If there is more than one property owner, please attach a list of these property owners not listed on this form. s. ^ Attach proof of mailing for Natural Heritage and Endangered Species Program, if needed. ~. ^ Attach proof of mailing for Massachusetts Division of Marine Fisheries, if needed. s. ® Attach NOI Wetland Fee Transmittal Form s. ® Attach Stormwater Report, if needed. E. Fees 1. ^ Fee Exempt: No filing fee shall be assessed for projects of any city, town, county, or district of the Commonwealth, federally recognized Indian tribe housing authority, municipal housing authority, or the Massachusetts Bay Transportation Authority. Applicants must submit the following information (in addition to pages 1 and 2 of the NOI Wetland Fee Transmittal Form) to confirm fee payment: 5083 & 5091 ~ ~ 11-10-2008 & 1-16-09 2. Municipal Check Number ,• 3. Check date 5077 & 5092 11-10-2008 & 1-16-09 4. State Check Number 5. Check date Northern Avenue Homes, Inc. 6. Payor name on check: First Name 7. Payor name on check: Last Name wpaform3.doc • rev. 02/21/08 Page 7 of 8 ~l Massachusetts Department of Environmental Protection Bureau of Resource Protection -Wetlands WPA Form 3 -Notice of Intent Massachusetts Wetlands Protection Act M.G.L..c. 131, §40 F. Signatures and Submittal Requirements ~.~v~s~~ Provided by MassDEF': '246-0625 _ _ MassDEP File Number Document Transaction'Number' Northampton City/Town I hereby certify under the penalties of perjury that the foregoing Notice of Intent and accompanying plans, documents, and supporting data are true and complete to the best of my knowledge. I understand that the Conservation Commission will place notification of this Notice in a local newspaper at the expense of the applicant in accordance with the wetlands regulations, 310 CMR 10.05(5)(a). I further certify under penalties of perjury that all abutters were notified of this application, pursuant to the requirements.of M.G.L. c. 131, § 40. Notice must be made by Certificate of Mailing or in writing by hand delivery or certified mail (return receipt requested) to all abutters within 100 feet of the property line of the project location. t\ ~.~ 3. Signature of Property Owner (if different) 5. Signature of Representative (if any) 1-16-2009 2. Date 4. Date 6. Date For Conservation Commission: Two copies of the completed Notice of Intent (Form 3), including supporting plans and documents, two copies of the NOI Wetland Fee Transmittal Form, and the city/town fee payment, to the Conservation Commission by certified mail or hand delivery. For MassDEP: One copy of the completed Notice of Intent (Form 3), including supporting plans and documents, one copy of the NOI Wetland Fee Transmittal Form, and a copy of the state fee payment to the MassDEP Regional Office (see Instructions) by certified mail or hand delivery. Other: If the applicant has checked the "yes" box in any part of Section C, Item 3, above, refer to that section and the Instructions for additional submittal requirements. The original and copies must be sent simultaneously: Failure by the applicant to send copies in a timely manner may result in dismissal of the Notice of Intent. wpaform3.doc • rev. 02/21/08 Page 8 of 8 ~~ ( j ~ ~,~vt~~C7 ___ Massachusetts Department of Environmental Protection Bureau of Resource Protection -Wetlands NOI Wetland- Fee :Transmittal Form Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 A. Applicant Information ' Important: . When filling out forms on the 1. Applicant: computer, use only the tab key to move your cursor - do not a. First Name b. Last Name use the return Tofino Associates, Inc. and Northern Avenue Homes, Inc. key. c. Organization . 31 Campus Plaza Road . ' r~ : d. Mailing Address Hadley MA 01035 raRm e. CitylTown f. State g. Zip Code _(413) 256-0321 (413) 256-0130 h. Phone Number i. Fax Number j. Email Address 2. Property Owner (if different): a. First Name b. Last Name c. Organization d. Mailing Address e. City/Town f. State g. Zip Code h. Phone Number i. Fax Number j. Email Address 3. Project Location: Northern Avenue Northampton a. Street Address b. City/Town To calculate B Fees filing fees, refer , to the category fee list and The fee should be calculated usin the followin six-ste g g p process and worksheet. Please see examples in the ~ Instructions before filling out'worksheet. instructions for filling out WPA Form 3 (Notice of Step 1Rype of Activity: Describe each type of activity that will occur in wetland resource area and Intent). buffer zone. Step 2/Number of Activities: Identify the number of each type of activity. Step 3/Individual Activity Fee: Identify each activity fee from the six project categories listed in the instructions. Step 4/Subtotal Activity Fee: Multiply the number of activities (identified in Step 2) times the fee per category (identified in Step 3) to reach a subtotal fee amount. Note: If any of these activities are in a Riverfront Area in addition to another Resource Area or the Buffer Zone, the fee per activity should be multiplied by 1.5 and then added to the subtotal amount. Step 5/Total Project Fee: Determine the total project fee by adding the subtotal amounts from Step 4. Step 6/Fee Payments: To calculate the state share of the fee, divide the total fee in half and subtract . $12.50. To calculate the city/town share of the fee, divide the total fee in half and add $12.50. • Wetland Fee Transmittal Forrn • rev. 2/21 ~~ ~ ~ ~~ ~-~~~ ~~~v ~ s~t~ ~~ Massachusetts Department of Environmental Protection . ' Bureau of Resource Protection -Wetlands NOI Wetland Fee Transmittal Form Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 B. Fees .(continued) ~ . ~ ~ . Step 1/Type of Activity Step 2/Number ~ Step Step 4/Subtotal Activity of Activities 3/Individual Fee Activity Fee Category 3(b) -each building 5 $1,050 $5,250 Category 1=Resource Improvement $110 $110 C. Submittal Requirements Step 5Rota1 Project Fee: $5,360 Step 6/Fee Payments: Total Project Fee: $5,360 a. Total Fee from Step 5 State share of filing Fee:. $2,667.50 b. 1/2 Total Fee less $12.50 Cit /T h f filli $2,692.50 y own, s are o ng Fee: c. 1/2 Total Fee plus $12.50 a.) Complete pages 1 and 2 and send with a check or money order for the state share of the fee, payable to the Commonwealth of Massachusetts. Department of Environmental Protection Box 4.062. Boston, MA 02211 b.) To the Conservation Commission: Send the Notice of Intent or Abbreviated Notice of Intent; a copy of this form; and the city/town fee payment. To MassDEP Regional Office (see Instructions): Send a copy of the Notice of Intent or Abbreviated Notice of Intent; a copy of this form; and a copy of the state fee payment. (E-filers of Notices of Intent may submit these electronically.) • WPtlAnfl FPP I ~anemittal Fnfm I g .. 1 ~ . ~.,1 ~. March 6, 2008 Email Bruce Young Land Use & Conservation PIanner Office .of Planning & Development City ofNorthamptan 210 Main Street, Rm. 11, City Hall Northampton, MA 01060 0 0 0 RE: Vernal Pool Assessment Protocol Assessor's Map 25C, Parcel 01.2 &-017 Northern Avenue and View Avenue Northampton, Massachusetts Dear Mr. Young: 1LEC File#: KCI\07-300;01] Scanned Digitized Checked On behalf of the Applicant, Northern Avenue Homes, Inc., LEC Environmental Consultants, Inc., (LEC) has prepared this Verna] Pool Assessment Protocol to collect additional data on die above-referenced properties in Northampton, Massachusetts. A portion of the 5.5~ acre project site is.slated for development and the Applicant will conduct a comprehensive Vernal Pool Assessment in order to establish the boundary of the potentially certifiable Vernal Pools located on-site. According to the Massachusetts Geographic Information Systems (MassGIS) data layers {updated most.recently.in December 2007}, no Certified or Potential Vernal Pools exist on the prajectsite. However, prelirriinary investigations by Molly Hale, Vt~ildlife Biologist, on .August. l 8, .2407, have revealed the presence of fingernail clams (family Sphaeriidae, also known as Pisidiidae) and amphibious-snails (from two different families: Lymnaeidae and Planorbidae) within.small (dry) depressions scattered throughout the on-site Bordering Vegetated Wetland (BVW}system. While Ms. Hole's-data verifies that potentially certifiable`Vernal Pools- exist on-site (Vernal Pool Resource Areas protected under the City of Northampton TYetla~ads Protection 0;'~ditiafice, :Chapter 337), the functional limits of the potentially certifiable Vernal Pools have not yet been determined. Consequently, LEC will . conduct multiple site evaluations throughout the growing season (March IS 'through October 15, as referenced within the Ordi~rm~ce} to document the presence of surface waters needed over 60 consecutive days, as required under the Ordina~rce and defined within 310 CMR 10.04 (Vernal pool habitat) of the Massachusetts Id~etlands P1•otectiorl Act Regulatio~rs. At a minimum, LEC will conductaite visits twice a week commencing on March 15`I' through June lyt. Site visits thereafter will be dictated by the presence of surface waters, but ata minimum„at least twice a month through October 15`h. Furthermore, LEC will monitor precipitation data to ensure that rainfall during the observation period is at least 75%-of the average .over the last 20 years in Northampton, as required under the O~ c~inance. In addition to documenting the presence of surface waters, LEC personnel will search the on-site BVW system for evidence of amphibian breeding activity (e.g., mated pairs, egg masses, transfornung tadpoles/juveniles, etc,).and will record. any amphibian chorusing. LEC will be in direct. contact with the .LEG Environmental Consultants, lnc. www.lecenvironmental.aom 1248 ROUI~ 26A, Unit 6 3G Cordaga Part. Circle ~ 07 Audubon Road I? D. Box 776 Suite 312 Building ?. Suite 11d Cataumat, N1A 02534 Plymouth, MA 02360 VJaketield, MA D1880 -508-563-5357 5D6-7A6-9491 781-245-2500 508-563-5358 (Fax] 506-746.9492 fFaxj 781-245-66i'r iFax) capelec~~?lecenvironmental.com southlec'=;!IecenvUOnrnenial.aom noHhl~•cts?tlecanvironm<ntal.com P. D. Box 590 Rindge, 1~lH 03461 603-899-6726 603-899-6726 (Fax] nhlec~~ilecenvironmental:corn ~"~ ~ ~~.~ NOTICE OF INTENT NORTH STREET CONDOMINIUMS PROJECT NARRATIVE This Notice of Intent is being submitted to the Northampton Conservation Commission for the construction of a 23-unit townhouse condominium project, with associated roadway and stormwater management system, on property consisting of 2 parcels totaling approximately 5.6 acres, located'/~ mile from downtown. Existing Conditions The property is located off View Avenue, a private way off North Street owned by the applicant, and off the end of Northern Avenue. There is an intermittent stream that flows from the Industrial Park on the north, through a culvert under the new bike path and along the northwesterly edge of the subject property. The stream is also fed by the storm drain system on Northern Avenue, which flows into the swale adjacent to the bike path. There are bordering vegetated wetlands associated with the intermittent stream. The property slopes gradually and drains toward the BVW. The wetland and areas of upland within the wetland have some significant native trees, but there are also many invasive plant species in the area, including oriental bittersweet, Japanese knotweed, multi-flora rose, honeysuckle, and poison ivy. The adjacent uplands on the eastern half of the property contain even greater concentrations of invasive plants and are also degraded by historic filling, masonry and other construction and road building debris. The property has an existing house near View Avenue, for which a demolition permit has already been obtained. The house is surrounded by lawn, with a low stone wall at the edge of a portion of the lawn, and a plantation of non-native Norway Spruces beyond the lawn towards the west. Invasive species are common in these western upland areas, although not as predominant as in the eastern upland portions of the property. Proposed Work The proposed project consists of a duplex on Northern Avenue and 21 townhouse condominiums off North Street, for a total of 23 new dwelling units, with associated roadways, parking areas, driveways, sidewalks, utilities, landscaping and stormwater management system. There is approximately 2.1 acres of Bordering Vegetated Wetland. No alteration of any resource area is proposed, but a portion of the project falls within the 100-foot Buffer Zone of the BVW. The six buildings, each containing 2-6 units, fall (at least in part) within the 100-foot Buffer Zone. All proposed work is outside the 35-foot wetland buffer. The 35-foot buffer shall remain a permanent No Disturb Zone. There is one detention basin and two rain gardens, each located within the 100-foot Buffer Zone. All grading, pipes and outfall structures are kept at least 35 feet from the BVW. One hundred percent of the roof run-off is infiltrated through the use of linear dry wells adjacent to the units, and 2 rain gardens. Because of the Type C soils on the site, the project is only required to infiltrate runoff to the maximum extent practicable per DEP stormwater regulations. However, the project actually meets the DEP standard for infiltration of 65% that is required on sites with soils that are better drained (soil Types A and B). The project infiltrates 66% of the new impervious area. In order to further maximize infiltration on site, all BMPs have been designed to hold twice the recharge volume directed to them. Additionally, snowmelt is infiltrated in two snowmelt trenches located adjacent to unit 1 and unit 15. All road run-off is pretreated before it enters a detention basin. Mechanisms to treat water quality include the two rain gardens, six drywells, a proprietary treatment chamber, and deep sump hooded catch basins. 1 ~~ Utilities will be installed to service the lots as follows: Sewer: All units are serviced by the City sewer system. Water: All units are serviced by the City water system. Electric, Telephone and Cable Systems: All units are served by underground services. Natural Gas: All units are served.by underground gas service. No work is proposed that will enter or alter the 2.1 acre Bordering Vegetated Wetland resource areas. Relationship to the Northampton Wetlands Protection Ordinance The North Street condominium project is located in the URB zoning district, which is a district that is already densely developed and where the City seeks additional development per its approved Sustainablility Plan. The North Street Condominium development is a true infill project, sited within the context of preexisting residential neighborhoods, and providing attractive residential options within easy walking distance of schools, jobs, retail establishments, restaurants and entertainment. Section 337-10(B) of the City Code states that "To encourage infill development, which is considered more sustainable under the principles of smart growth and generally has a smaller environmental footprint than development in outlying areas, in ...Urban Residential-B... Zoning Districts, the Conservation Commission hereby waives any of the § 337-10 performance standards that are over and above state law with the exception of the setback requirements in Table (1 ): Zoning District No-Encroachment Zone Urban 35 feet from wetlands; Residential-B 10 feet from wetlands may be allowed at the and Urban discretion of the Conservation Commission if Residential-C applicant provides extraordinary mitigation, replication, restoration or open space preservation measures The plans show all work, including buildings, grading, walls, yards, patios, and all components of the stormwater management system, at least 35 feet from the BVW. Additionally, of the 23 units, all but 3 are outside the 50-foot wetland buffer, and most of the roadways, driveways and parking areas are outside the 100-foot buffer. The plans also show mitigation for buffer zone impacts which improve the condition of the buffer zone ("adjacent upland area") in accordance with Section 337-10(E)(2): The City's general policy is no encroachment within 50 feet of wetlands. The Commission may allow work within the fifty-foot non-encroachment zone in response to a written request for a waiver, which shall include a written and plan view assessment as part of the application process as follows: (b) Projects in certain infill areas, in accordance with Table (1) in § 337-10, where development includes mitigation measures that will improve the existing condition of the wetlands or adjacent upland area and is otherwise permissible under the Massachusetts Wetlands Protection Act. While there is some inconsistency in the sections of the Northampton Wetlands Protection Ordinance quoted above regarding the local requirement for mitigation for work within the 35-50-foot buffer zone for infill projects in URB, we hereby request a waiver of the general policy of no encroachment within 50 feet of wetlands, and are proposing mitigation measures as described below. 2 ~ ~~ Bordering Vegetated Wetland Delineation Method The boundaries of the Bordering Vegetated Wetlands on site were flagged by Chuck Dauchy using wetland vegetation and soil indicators, and were accepted by the Northampton Conservation Commission with a positive determination issued August 24, 2007. A copy of the Determination is attached to this Notice of Intent. Erosion Controls During Construction Erosion controls will consist of entrenched silt fencing, located no closer than 35 feet to the wetland buffer as shown on the plan. This will be the limit of work line. Erosion controls will remain in place until construction is complete and exposed soils have been successfully stabilized by vegetation. Mitigation of Potential Impacts to Resource Areas All invasive plants within the areas of the 10-35 foot buffer zone hatched on the plan and located primarily but not exclusively behind units 14-21, will be removed and replaced with native plants with high wildlife value. While this area will be the focus of invasive plant removal since the density of invasive plants in this area is greatest, other invasive plants throughout the entire site that are located 10 feet or more from the wetlands will also be removed. They will be replaced with native plants where the density of invasive plants removed is great enough that replanting is required. All work will be done by hand, with no equipment to enter the 35-foot buffer zone. All replacement plants will be nursery grown, and will include species listed on the plant schedule under "Native Species Planting Buffer." The significant stand of Japanese Knotweed in the 10-35 foot buffer zone hatched on the plan behind units 11-14 will be eradicated and the buffer restored. We will use the following strategy, a combination of initial hand removal of the knotweed followed by chemical treatment, both based on the Nature Conservancy's Best Management Practices found on various websites. 1. After initial re-growth of knotweed in spring and before flowering in early July, stalks will be cut down, and as much of the root stock and seed source as possible will be removed. 2. Cuttings and rhizomes will be burned or placed in tough black plastic bags in the sun to "melt" outside the 100-foot wetland buffer for at least one month, and then removed from the site. 3. After August 1 and before frost, any new knotweed stalks will be cut approximately 2 inches above ground level. 4. Avery small area of knotweed will be cut at a time and a 25% solution of glyphosate (e.g., Rodeo, which is preferable to Roundup since the application will be near wetland areas) will be immediately applied directly into the stem cavity as well as the cut surface via hand wiping, dripping and/or stem injection. This work will be performed by a licensed herbicide applicator. 5. Any new cuttings will be burned or placed in tough black plastic bags in the sun to "melt" outside the 100-foot wetland buffer for at least one month and then removed from the site. 6. The area will then be densely replanted with native trees and shrubs following the planting plan and schedule, to provide shade to help prevent the reemergence of knotweed. 7. The process will be followed for 5 years, as continued vigilance and multiple applications of herbicide to the cut stems of any knotweed re-growth will be required over the years to keep the knotweed from reestablishing. Chemical treatments will take place after August 1 of each year since treatments in late summer or early fall are much more effective in preventing re-growth of Japanese knotweed the following year. For the record, it would be far easier to control the knotweed if it could be removed in its entirety (right down to the edge of the wetland). However the Northampton Wetlands Protection Ordinance, in its current form, does not permit such work closer to the wetland than the 10 foot buffer. The existing lawn area between the 10-foot and 35-foot buffer behind units 1 and 11-14, will be converted to functional buffer zone through re-vegetation. The lawn area will no longer be mowed or cultivated in any way, and native tree and shrub species with high wildlife habitat and forage value will be planted in accordance with the planting plan and schedule. ~~~ ~~-~ In addition, native plantings of trees and understory shrubs will be installed by hand just within the 35-foot buffer zone and on the side slopes of the detention basin, as shown on the plan. This planted buffer edge will improve the wildlife habitat value of the existing buffer by providing wildlife cover, edge habitat and high quality forage. Wetland markers, clearly visible at 18 inches above grade, have been installed to mark the location of the approved wetland flags and will remain in place during construction. Afterward, they will be hammered flush with the ground and left in place permanently. The 35-foot No Disturb Zone will be marked as follows: • A portion of the 35-foot No Disturb Zone will be marked by the edge of a paved footpath, which is actually located at approximately 37-38 feet from the wetland. This path will be the limit of activity and use behind units 1-4 and units 15-19 and, along with a retaining wall, will form the edge of the common open space between these units. • The rest of the 35-foot No Disturb Zone, with the exception of the area around the detention basin, will be permanently marked by concrete bounds, set 2 feet above ground and spaced no more than 25 feet apart. Each bound will be clearly labeled "Wetland Buffer - Do Not Disturb." • The topography of the detention basin itself provides a clear edge to the 35-foot No Disturb Zone. The basin provides a physical barrier that goes further from the wetland than the 35-foot No Disturb Zone, and it is not an area that will ever be used by people or potentially expanded. • A buffer of native trees and/or understory shrubs will be planted by hand along the entire 35-foot wetland buffer, including along the wetland side of the foot path and on the outside slope of the detention basin. This will provide a visual edge that demarcates the No Disturb Zone. We are also proposing a comprehensive Declaration of Covenants and Restrictions in order to relieve the Conservation Commission of responsibility for inspecting and enforcing the integrity of the 35-foot No Disturb Zone to the maximum extent practicable. We are proposing that the Condominium Association hire a professional acceptable to the Conservation Commission to inspect the No Disturb Zone annually and issue a report to the Commission in conjunction with the annual report on the condition of the storm water system and its maintenance. An escrow account will be established with signatory powers given to the City of Northampton that will make funds available for either inspections not performed or remedial measures if needed, in the event the Condominium Association fails to comply with requirements for continued monitoring and any necessary maintenance or restoration of the 35-foot No Disturb Zone, or with requirements of the Stormwater Management Plan. We have included with this Notice of Intent a draft of the sections of the Declaration of Covenants and Restrictions that are pertinent to the Conservation Commission and its jurisdiction, specifically sections titled "Storm Water Management," Snow Removal and Management Plan," 35-Foot Wetland Buffer No Disturb Zone," Common Open Space," and "Escrow Account." We expect that the Declaration of Covenants and Restrictions will be finalized with the assistance of Planning and Conservation Staff, and will incorporate all conditions of permit approval. Additional Information USGS Location Map City of Northampton Wetlands Application WPA Form 3 -Notice of Intent Notification Sent to Abutters Abutters List for Map 25C, Parcels 12 and 17 Summary Stormwater Report Draft Sections of Declaration of Covenants and Restrictions Determination of Applicability, Issued August 24, 2007 "Site Plan" by the Berkshire Design Group, dated April 14, 2009 Full Stormwater Report 4 ~ ~~-~ City of Northampton--Wetlands Application This form is required for all applications filed under the Northampton Wetlands Ordinance File with the Office of Planni~tg and Developsrent, 210 Main Street, Northmnpton, MA 01060 We recommend applicants consult with tlTe Land Use and Conservation Planner (587-1263) before applying 1. Check what kind of permit you are requesting ^ Request for Determination of Applicability (WPA form 1) Notice of Intent (WPA form 3) ^ Abbreviated Notice of Resource Area Delineation (WPA form 4A) 2. Property Street Address: $ Vie.tN /~y'fYlnt£ and Nor-l-ln2YVi ~4y~e.y~U.e~ 3. Assessors' Map and Parcel: 25G - 1 Z Second lot (if any) Map and Parcel(s): 25 C - l Additional property description: 4. Check the items enclosed. Your application will not be accepted if any items are missing. ® The appropriate completed Massachusetts DEP application http•//www mass~ov/den,_ /water/approvals/wwforms.htm ~ Completed versions of this Wetlands Application ® Nine (9) copies of the fully completed and collated application packages (forms, plans and attachments) ® All plans folded (not rolled) and collated with each application packet ® For Notice of Intent applications only, submit the following: [~ Appropriate Notice of Intent Conservation Commission Fees http•//www northamptonma gov/opd/u~loads/listWidget/2533/opd%20fees.pdf ® An abutters list of all property owners within at least 100 feet of the property line of your project. Abutters lists may be generated at www.NorthamptonMA.gov/opd (click on Database: Abutters, Permits and Historic). Computers are available at City Hall, Forbes and Lilly Libraries. ^ For Request for Determination applications, appropriate Request for Determination of Applicability Fees http•//www northamptonma gov/opd/uploads/listWidget/2533/opd%20fees.ndf ^ For Notice of Resource Area Delineation use Notice of Intent Fee http•//www northamptonma gov/opd/uploads/listWidget/2533/opd%20fees.ndf ^ A #10 business envelope addressed to the applicant. 5. Provide an Existing Conditions Site Plan. Check the items shown on that plan. You may request a waiver from submittal requirements, with a reason for the waiver request. ® Boundary of entire lot and notation of lot area ® Context of adjacent lots, if necessary to show extent of wetland/Riverfront Area ® Numbered wetland flags ^ Existing and potential vernal pools N/~. ® 59'~,ND 100' wetland buffer ^ Mean Annual High Water line, for Riverfront Area permits N/A ^ 100' inner riparian zone AND 200' outer riparian zone, for Riverfront Area permits N/A ~I Existing structures, impervious surfaces (ie: pavement, gravel) and lawn areas ® Edge of vegetation accurately measured or surveyed ® Significant (8"+ Diameter Breast Height) trees within the limit of work area that are also within the 200' Riverfront Area, Bordering Vegetated Wetland, or 100'•wetland buffer ~d9t of }re~,s ® 2' contours ^ Elevations in feet (not meters), for projects within the floodplain N/A ® Zoning setbacks ® 1:20 scale, if possible ~~ 6. If new work is proposed, provide a Proposed Site Plan. Check the items shown on that plan. You may request a waiver from submittal requirements, with a reason for the waiver request. ® Grading/proposed new contours ®. Hardscape (i.e.: footprint of house, driveway, walkways, terraces, etc...) ® Any removal of vegetation and significant trees within the Riverfront Area, wetland and buffer ® Landscaping and plantings within the Riverfront Area, wetland and wetland buffer ® Location of erosion control barrier L~ Limit of work line ® Utility lines ~ Stormwater Management Form (use DEP form www.mass. og v/dep/brp/ww/wwforms.htm), if required ^ Wildlife assessment if the site is in a habitat resource area based on NHESP maps, Northampton Potential and Certified Vernal Pools Map or otherwise required by the Act or Ordinance. N /,Q ® At the same scale as the Existing Conditions Site Plan ^ For new homes in the Riverfront Area only, documentation of the date the lot was recorded. tJ/~. 7. We have provided and requested information and believe and understand that (initial each item below): 28' d s er Ike-l-lc~r.d~s ~ro~4cc1-~:ar, D--dvtia.~.~e. Application deadline is ~~-sa~la~>r~ea~k prior to a public hearing. If the application is incomplete or waivers are requested, however, the public hearing maybe delayed; We will check for the date and time of our public hearing at www.NorthamptonMA.gov or in the Daily Hampshire Gazette Legal Ads section. Such notice is posted seven days prior to the public hearing; The Conservation Commission may request an alternatives analysis for work proposed within the buffer zone of a wetland; he Conservation Commission and their representatives have permission to enter the property; All documents and plans submitted are in the public domain and maybe copied freely in any form; and The City will record Orders of Conditions and Order of Resource Area Delineations at the Hampshire County Registry of Deeds. 8. PLEASE COMPLETE ONLY IF APPLYING FOR A NOTICE OF INTENT or ABBREVIATED NOTICE OF RESOURCE ARE DELINEATION: - e certify under the pains and penalties of perjury, that PRIOR to filing this application all abutters were notified of this application pursuant to the requirements of M.G.L. c. 131 § 40. Notice must be made in writing by hand delivery or certified mail (return receipt requested) to all abutters within 100 feet of th property line of the project location. Norkhern eve. -Nvmes ,Inc,. d- ~.,_,~ Applicant (print or type): o~-i vl o A~sSOC.ta S 3 I VIG . Applicant Signature: Address: ~ I ,AYVL ~S p~c~'LA. ~~ . Applicant Phone: 2~J(o - 0?~21 -I-~~.d lcy , MCc O 1035 Owner (print or type):~~1 Owner Signature: Address: Owner Phone:, Date submitted: ~ ~ 16- ~ q The Northampton Conservation Commission generally meets on the 2nd and 4°i Thursdays of each month in Hearing Room 181ocated on the 2nd floor of City Hall, 210 Main Street Page 2 of 2 ~~ ~~ ~~ ~. Massachusetts Department of Environmental Protection Bureau of Resource Protection -Wetlands __ . OI"Il'1 -Notice of Intent Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Important: When filling out forms on the computer, use only the tab key to move your cursor - do not use the return key. tab. iehrn Provided by MassDEP MassDEP File Number Document Transaction Number`1~ Northampton City/Town A. General Information 1 Project Location ,(Note: electronic filers will click on button to locate project site): Northern Avenue Northampton a. Street Address b. City/Town Latitude and Longitude: ~ d. Latitude e. Longitude 25C 12&17 ' f. Assessors Map/Plat Number 2. Applicant: a. First Name b. Last Name Note: Tofino Associates, Inc. and Northern Avenue Homes, Inc. Before c. Organization completing this 31 Campus Plaza Road form consult your local d. Street Address Conservation Hadley MA 01035 Commission e. City/Town f. State g. Zip Code regarding any (413) 256-0321 (413) 256-0130 municipal bylaw or ordinance. h. Phone Number i. Fax Number j. Email Address 3. Property owner (required if different from applicant): ^ Check if more than one owner a. First Name b. Last Name c. Organization d. Street Address e. City/Town f. State g. Zip Code h. Phone Number i. Fax Number j. Email address 4. Representative (if any): g. Parcel /Lot Number a. First Name b. Last Name c. Company d. Street Address e. City/Town f. State 01060 c. Zip Code g. Zip Code h. Phone Number i. Fax Number j. Email address 5. Total WPA Fee Paid (from NOI Wetland Fee Transmittal Form): $6,300 $3,137.50 $3,162.50 + $100.00 local fee a. Total Fee Paid b. State Fee Paid c. City/Town Fee Paid wpaform3.doc • rev. 02/21/08 Page 1 of 8 ... - ~~ Provided by MassDEP: Massachusetts Department of Environmental Protection Bureau of Resource Protection -Wetlands MassoEP Fae Number WPA Form 3 -Notice of Intent Document Transaction Number' Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Northampton City/Town A. General Information (continued) 6. General Project Description: The proposed project consists of a duplex on Northern Avenue and 23 townhouse condominiums off North Street, for a total of 25 new dwelling units, with associated stormwater management, site, utility and road work. A portion of the project falls within the Buffer Zone of BVW. No alteration of any resource area is proposed. 7a. Project Type Checklist: 1. ^ Single Family Home 3. ^ Limited Project Driveway Crossing 5. ^ Dock/Pier 7. ^ Coastal Engineering Structure 9. ^ Transportation 7b. Is any portion of the proposed activity eligible to be treated as a limited project subject to 310 CMR 10.24 (coastal) or 310 CMR 10.53 (inland)? ~. ^ Yes ® No If yes, describe which limited project applies to this project: 2. Limited Project 8. Property recorded at the Registry of Deeds for: Hampshire a. County b. Certificate # (if registered land) Book 8428, Page 219 Book 8829, Page 341 c. Book and Page d. Book and Page B. Buffer Zone & Resource Area Impacts (temporary & permanent) 1. ®Buffer Zone Only -Check if the project is located only in the Buffer Zone of a Bordering Vegetated Wetland, Inland Bank, or Coastal Resource Area. 2. ^ Inland Resource Areas (see 310 CMR 10.54-10.58; if not applicable, go to Section B.3, Coastal Resource Areas). 2. ® Residential Subdivision 4. ^ Commercial/Industrial 6. ^ Utilities 8. ^ Agriculture (e.g., cranberries, forestry) 10. ^ Other Check all that apply below. Attach narrative and any supporting documentation describing how the project will meet all performance standards for each of the resource areas altered, including standards requiring consideration of alternative project design or location. For all projects affecting other Resource Area Resource Areas, please attach a a. ^ Bank narrative explaining how b. ^ Bordering Vegetated the resource Wetland area was delineated. c. ^ Land Under Waterbodies and Waterways wpaform3.doc • rev . 02/21/08 Size of Proposed Alteration 1. linear feet 1. square feet 1. linear feet Proposed Replacement (if any 3. cubic yards dredged 2. linear feet 2. square feet 2. linear feet Page 2 of 8 I ~/ ~. Massachusetts Department of Environmental Protecfion Provided by MassDEP: BUreaU Of R2SOUrCe PrOteCtlOn -Wetlands ' MassDEP File Number WPA FOrm 3 -Notice of Intent Document Transaction Number' Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 `Northampton City/Town B. Buffer Zone & Resource Area Impacts (temporary & permanent) (cont'd) Resource Area d. ^ Bordering Land Subject to Flooding e. ^ Isolated Land Subject to Flooding Size of Proposed Alteration 1. square feet 3. cubic feet of flood storage lost 1. square feet 2. cubic feet of flood storage lost Proposed Replacement (if any) 2. square feet 4. cubic feet replaced 3. cubic feet replaced f. ^ Riverfront Area 1. Name of Waterway (if available) 2. Width of Riverfront Area (check one): ^ 25 ft. -Designated Densely Developed Areas only ^ 100 ft. -New agricultural projects only ^ 200 ft. -All other projects Online Users: Include your document transaction number (provided on your receipt page) with all supplementary information you submit to the Department. s. Total area of Riverfront Area on the site of the proposed project: 4. Proposed alteration of the Riverfront Area: square feet a. total square feet b. square feet within 100 ft. c. square feet between 100 ft. and 200 ft. 5. Has an alternatives analysis been done and is it attached to this NOI? ^ Yes ^ No s. Was the lot where the activity is proposed created prior to August 1, 1996? ^ Yes ^ No 3. ^ Coastal Resource Areas: (See 310 CMR 10.25-10.35) Check all that apply below. Attach narrative and supporting documentation describing how the project will meet all performance standards for each of the resource areas altered, including standards requiring consideration of alternative project design or location. Resource Area Size of Proposed Alteration Proposed Replacement (if anvl a. ^ Designated Port Areas Indicate size under Land Under the Ocean, below b. ^ Land Under the Ocean 1. square feet 2. cubic yards dredged c. ^ Barrier Beach Indicate size under Coastal Beaches and/or Coastal Dunes below d. ^ Coastal Beaches 1. square feet 2. cubic yards beach nourishment e. ^ Coastal Dunes wpaform3.doc ^ rev. 02/21/08 1. square feet 2. cubic yards dune nourishment Page 3 of 8 ~. ~ ~ Massachusetts D~Nartment of Environmental Protection Provided by MassDEP: BUreaU Of ReSOUfCe PrOteCtlOrl -Wetlands MassDEP File Number WPA Form 3 -Notice of Intent Document Transaction Number' Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Northampton City/Town B. Buffer Zone & Resource Area Impacts (temporary & permanent) (cont'd) Size of Proposed Alteration Proposed Replacement (if any) f. ^ Coastal Banks 1. linear feet g. ^ Rocky Intertidal Shores 1. square feet h. ^ Salt Marshes 1. square feet 2. sq ft restoration, rehab., creation i. ^ Land Under Salt Ponds 1. square feet 2. cubic yards dredged ~. ^ Land Containing Shellfish 1. square feet k. ^ Fish Runs Indicate size under Coastal Banks, inland Bank, Land Under the Ocean, and/or inland Land Under Waterbodies and Waterways, above 1. cubic yards dredged I. ^ Land Subject to Coastal Storm Flowage 1. square feet 4. ^ Restoration/Enhancement If the project is for the purpose of restoring or enhancing a wetland resource area in addition to the square footage that has been entered in Section B.2.b or B.3.h above, please enter the additional amount here. a. square feet of BVW b. square feet of Salt Marsh C. Other Applicable- Standards and Requirements Streamlined Massachusetts Endangered Species Act/Vl/etlands Protection Act Review 1. Is any portion of the proposed project located in Estimated Habitat of Rare Wildlife as indicated on the most recent Estimated Habitat Map of State-Listed Rare Wetland Wildlife published by the Natural Heritage and Endangered Species Program (NHESP)? To view habitat maps, see the Massachusetts Natural Heritage Atlas or go to http•//www mass gov/dfwele/dfw/nhese/nhregmap htm. a. ^ Yes ® No If yes, include proof of mailing or hand delivery of NOI to: Natural Heritage and Endangered Species Program Division of Fisheries and Wildlife 2008 (MassGIS) Route 135, North Drive b. Date of map Westborough, MA 01581 If yes, the project is also subject to Massachusetts Endangered Species Act (MESA) review (321 CMR 10.18). To qualify for a streamlined, 30-day, MESA/Wetlands Protection Act review, please complete Section C.1.C, and include requested materials with this Notice of Intent (NOI); OR complete Section C.1.d, if applicable. If MESA supplemental information is not included with the NOI, by completing Section 1 of this form, the NHESP will require a separate MESA filing which may take up to 90 days to review (unless noted exceptions in Section 2 apply, see below). wpaform3.doc • rev. 02/21/08 Page 4 of 8 e. ~~ ~~ Massachusetts Dl~partment of Environmental Protection Provided by MassDEP: Bureau of Resource Protection -Wetlands Mass~EP Fiie Number WPA Form 3 -Notice of Intent Document Transaction Number Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Northampton City/Town C. Other Applicable Standards and Requirements (cont'd) 1. c. Submit Supplemental Information for Endangered Species Review 1. ^ Percentage/acreage of property to be altered: (a) within wetland Resource Area percentage/acreage (b) outside Resource Area percentage/acreage 2. ^ Assessor's Map or right-of-way plan of site 3. ^ Project plans for entire project site, including wetland resource areas and areas outside of wetlands jurisdiction, showing existing and proposed conditions, existing and proposed tree/vegetation clearing line, and clearly demarcated limits of work ** (a) ^ Project description (including description of impacts outside of wetland resource area & buffer zone) (b) ^ Photographs representative of the site (c) ^ MESA filing fee (fee information available at: httg://www.mass.qov/dfwele/dfw/nhesp/nhenvmesa.htm) Make check payable to "Natural Heritage & Endangered Species Fund" and mail to NHESP at above address Projects altering 10 or more acres of land, also submit: (d) ^ Vegetation cover type map of site (e) ^ Project plans showing Priority & Estimated Habitat boundaries d. OR Check One of the Following 1. ^ Project is exempt from MESA review. Attach applicant letter indicating which MESA exemption applies. (See 321 CMR 10.14, http•//www mass aov/dfwele/dfw/nhesp/nhenvexemptions.htm; the NOI must still be sent to NHESP if the project is within estimated habitat pursuant to 310 CMR 10.37 and 10.59.) 2. ^ Separate MESA review ongoing. a. NHESP Tracking Number b. Date submitted to NHESP 3. ^ Separate MESA review completed. Include copy of NHESP "no Take" determination or valid Conservation & Management Permit with approved plan. Some projects not in Estimated Habitat may be located in Priority Habitat, and require NHESP review (see www.nhesp.org regulatory review tab). Priority Habitat includes habitat for state- listed plants and strictly upland species not protected by the Wetlands Protection Act. ** MESA projects may not be segmented (321 CMR 10.16). The applicant must disclose full development plans even if such plans are not required as part of the Notice of Intent process. wpaform3.doc • rev. 02/21/08 Page 5 of 8 tlOn Provided by MassDEP: Massachusetts De artment of Environmental Protec~~ F~ Bureau of Resource Protection -Wetlands MassDEP File Nurribe~ WPA Form 3 -Notice of Intelnt Document Transactiori Number' Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Northampton City/Town C. Other Applicable Standards and Requirements (cont'd) 2. For coastal projects only, is any portion of the proposed project located below the mean high water line or in a fish run? a. ® Not applicable -project is in inland resource area only b. ^ Yes ^ No If yes, include proof of mailing or hand delivery of NOI to either: South Shore - Cohasset to Rhode North Shore -Hull to New Hampshire: Island, and the Cape & Islands: Division of Marine Fisheries - Division of Marine Fisheries - North Shore Office Southeast Marine Fisheries Station Attn: Environmental Reviewer Attn: Environmental Reviewer 30 Emerson Avenue 838 South Rodney French Blvd. Gloucester, MA 01930 New Bedford, MA 02744 Also if yes, the project may require a Chapter 91 license. For coastal towns in the Northeast Region, please contact MassDEP's Boston Office. For coastal towns in the Southeast Region, please contact MassDEP's Southeast Regional Office. 3. Is any portion of the proposed project within an Area of Critical Environmental Concern (ACEC)? Online Users: a. ^ Yes ® No If yes, provide name of ACEC (see instructions to WPA Form 3 or MassDEP Include your Website for ACEC locations). Note: electronic filers click on Website. document transaction b. ACEC number (provided on 4. Is any portion of the proposed project within an area designated as an Outstanding Resource Water your receipt (ORW) as designated in the Massachusetts Surface Water Quality Standards, 314 CMR 4.00? page) with all supplementary a. ^ Yes ® NO information you submit to the 5. Is any portion of the site subject to a Wetlands Restriction Order under the Inland Wetlands department. Restriction Act (M.G.L. c. 131, § 40A) or the Coastal Wetlands Restriction Act (M.G.L. c. 130, § 105)? a. ^ Yes ® No 6. Is this project subject to provisions of the MassDEP Stormwater Management Standards? a. ® Yes. Attach a copy of the Stormwater Report as required by the Stormwater Management Standards per 310 CMR 10.05(6)(k)-(q) and check if: 1. ^ Applying for Low Impact Development (LID) site design credits (as described in Stormwater Management Handbook Vol. 2, Chapter 3) 2. ^ A portion of the site constitutes redevelopment 3. ^ Proprietary BMPs are included in the Stormwater Management System. b. ^ No. Check why the project is exempt: 1. ^ Single-family house 2. ^ Emergency road repair a. ^ Small Residential Subdivision (less than or equal to 4single-family houses or less than or equal to 4 units in multi-family housing project) with no discharge to Critical Areas. wpaform3.doc • rev. 02/21/08 Page 6 of 8 C / \ ~ Massachusetts Department of Environmental Protection Provided by MassDEP: BUreaU Of R2SOUrCe PrOteCtlOn -Wetlands ' MassDEP File Number ., WPA Form 3 -Notice of Intent Document Transaction Number' Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Northampton City/Town D. Additional Information Applicants must include the following with this Notice of Intent (NOI). See instructions for details. Online Users: Attach the document transaction number (provided on your receipt page) for any of the following information you submit to the Department. 1. ® USGS or other map of the area (along with a narrative description, if necessary) containing sufficient information for the Conservation Commission and the Department to locate the site. (Electronic filers may omit this item.) 2. ® Plans identifying the location of proposed activities (including activities proposed to serve as a Bordering Vegetated Wetland [BVW] replication area or other mitigating measure) relative to the boundaries of each affected resource area. s. ® Identify the method for BVW and other resource area boundary delineations (MassDEP BVW Field Data Form(s), Determination of Applicability, Order of Resource Area Delineation, etc.), and attach documentation of the methodology. a. ® List the titles and dates for all plans and other materials submitted with this NOI. Notice of Intent Plans for North Street Condominiums, sheets L1,L2a,L2b,L3a,L3b,L4,L5,EC1 a. Plan Title The Berkshire Design Group b. Prepared By April 14, 2009 d. Final Revision Date f. Additional Plan or Document Title Mark Darnold c. Signed and Stamped by varies e. Scale g. Date s. ^ If there is more than one property owner, please attach a list of these property owners not listed on this form. s. ^ Attach proof of mailing for Natural Heritage and Endangered Species Program, if needed. ~. ^ Attach proof of mailing for Massachusetts Division of Marine Fisheries, if needed. s. ® Attach NOI Wetland Fee Transmittal Form s. ® Attach Stormwater Report, if needed. E. Fees 1. ^ Fee Exempt: No filing fee shall be assessed for projects of any city, town, county, or district of the Commonwealth, federally recognized Indian tribe housing authority, municipal housing authority, or the Massachusetts Bay Transportation Authority. Applicants must submit the following information (in addition to pages 1 and 2 of the NOI Wetland Fee Transmittal Form) to confirm fee payment: 5109 2. Municipal Check Number 5111 4. State Check Number Northern Avenue Homes, Inc. 6. Payor name on check: First Name April 14, 2009 3. Check date April 14, 2009 5. Check date 7. Payor name on check: Last Name wpaform3.doc • rev. 02/21/08 Page 7 of 8 !: j .^~ \I ~- Massachusetts Department of Environmental Protection Provided by MassDEP: Bureau of Resource Protectlon -Wetlands MassDEP File Number WPA Form 3 -Notice of Intent Document Transaction Number. Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Northampton City/Town F. Signatures and Submittal Requirements hereby certify under the penalties of perjury that the foregoing Notice of Intent and accompanying plans, documents, and supporting data are true and complete to the best of my knowledge. I understand that the Conservation Commission will place notification of this Notice in a local newspaper at the expense of the applicant in accordance with the wetlands regulations, 310 CMR 10.05(5)(a). I further certify under penalties of perjury that all abutters were notified of this application, pursuant to the requirements of M.G.L. c. 131, § 40. Noti e must be made by Certificate of Mailing or in writing by hand delivery or certified mail (return receipt req ested) to all abutters within 100 feet of the property line of the project location. . April 15, 2009 1. S' ature of Applicant 2. Date 3. Signature of Property Owner (if different) 4. Date 5. Signature of Representative (if any) 6. Date For Conservation Commission: Two copies of the completed Notice of Intent (Form 3), including supporting plans and documents, two copies of the NOI Wetland Fee Transmittal Form, and the city/town fee payment, to the Conservation Commission by certified mail or hand delivery. For MassDEP: One copy of the completed Notice of Intent (Form 3), including supporting plans and documents, one copy of the NOI Wetland Fee Transmittal Form, and a copy of the state fee payment to the MassDEP Regional Office (see Instructions) by certified mail or hand delivery. Other: If the applicant has checked the "yes" box in any part of Section C, Item 3, above, refer to that section and the Instructions for additional submittal requirements. The original and copies must be sent simultaneously. Failure by the applicant to send copies in a timely manner may result in dismissal of the Notice of Intent. wpaform3.doc • rev. 02/21/08 Page 8 of 8 r~~ '~ Stormwate~ Drainage Repot for North Street Condominiums Northampton, MA April 14, 2009 Prepared by: The = Berkshire Prepared for: ~' Design Tofino Associates, Inc. Group ,Inc . 31 Campus Plaza Road 4 Allen Place, Northampton, Massachusetts 01060 Hadley, MA 01035 ~ North Street Condominim._ April 14, 2009 Northampton, Massachusetts Stormwater Drainage Report Table of Contents Introduction 2 Site Terrain and Soils 2 Existing Conditions 3 Proposed Conditions 3 Calculations and Design 4 Stormwater Standards 6 Summary 8 References 8 Figures Figure 1 Pre- Development Drainage Area Map Figure 2 Post Development Drainage Area Map Figure 3 USDA Soils Map Appendices Appendix A Pre- and Post Development Hydrologic Calculations Appendix B Soil Test Pit Information Appendix C TSS Removal Summary and Calculations Appendix D Standard 3 Recharge Calculations Appendix E Proposed Stormwater Management System Operation &Maintenance Plan Appendix F Long Term Pollution Prevention Plan Appendix G Stormwater Pollution Prevention and Erosion Control Plan The Berkshire Design Group, Inc. Page 1 ~) ~~ North Street Condominiui.__ ~ April 14, 2009 Northampton, Massachusetts Stormwater Drainage Report I. Introduction The following report presents an analysis of the stormwater management system for the proposed development of 23 housing units located off of Northern Avenue in zoning district URB in Northampton, Massachusetts. The proposed development includes 23 new housing units and associated parking areas, driveways (approximately 1009 LF), and sidewalks, utilities, landscape features and stormwater management system. The total site area is approximately 6 acres of which approximately 2.48 acres will be disturbed by construction activities. The impervious area on site will increase by approximately 1.04 acres due to the new development and the stormwater management system has been designed to minimize proposed peak flows to reduce or match existing flows off the site. Mechanisms to reduce runoff and treat water quality include rain gardens, a proprietary treatment chamber, snow melt trenches, dry wells, deep sump hooded catch basins, and a detention basin. II. Site Terrain and Soils The project site is comprised of gradual sloping terrain, which generally drains toward the wetlands on the west part of the site. The USDA Soil Survey of Hampshire County, Massachusetts, Central Part report classifies the site soils as (see attached soil map): • (Ra) Raynham Silt Loam Hydrologic Group: C Flood Risk: None Depth to Water Table: 0.5'-2.0' Depth to Bedrock: >60" • (Au) Amostown-Windsor Silty Substratum Hydrologic Group: C Flood Risk: None Depth to Water Table: 1.5'-3.0' Depth to Bedrock: >60" • (Ud) Udorthents Smooth Soil formed by cutting or filling developed area. Reference pedon not given. Assumed Hydrologic Group: C The Berkshire Design Group, Inc. Page 2 North Street Condominiui._._-J April 14, 2009 Northampton, Massachusetts stormwater Drainage Report A series of test pits were conducted on site to determine subsurface conditions. The purpose of the test pits was to evaluate the site for the existence of ledge, the ability of the site to support stormwater drainage components, and for groundwater information. In general, the test pits confirmed the USDA Soil Survey findings for the site as ground water is generally very high throughout the site, thereby reducing the potential areas where infiltration would be feasible. The test pit logs are attached in Appendix B. III. Existing Conditions The existing site includes one drainage area: E-1. The existing drainage area boundary is depicted on the Pre-Development Drainage Area Plan (Figure 1). The overall curve number (CN) in existing conditions is 74. The control point to determine peak flow in existing conditions is the stream located on the property line west of the site shown on Figure 1 as E-CP. The following is a brief description of the drainage area: E-1 E-1 is approximately 7.84 acres in size (approximately 0.14 acres of impervious area) and contains existing houses, pavement, grass, wooded areas, and a large wetland area on the west part of the site. Runoff flows overland in a southwestern direction through the wetlands and to the stream located southwest of the site. IV. Proposed Conditions The stormwater management system in proposed conditions has been designed to treat and reduce runoff on site. The proposed site contains four drainage areas: P- 1, P-2, P-3, and P-4 (See Figure 2) and the overall curve number (CN) in proposed conditions is 78. The. control point to determine peak flow in proposed conditions . is the stream located on the property line located west of the site shown on Figure 2 as P-CP. The following is a brief description of each drainage area: P-1 P-1 is approximately 5.68 acres in size and contains the northwestern area of the site consisting of all of the wetland area, grass and wooded areas, and new roof and pavement, as well as new sidewalks and retaining walls. The drainage follows a similar pattern as in existing conditions. It flows overland in a southwestern direction through the wetlands and to the stream located southwest of the site. The runoff from the new roof areas located within P-1 is directed to dry wells where the water is infiltrated into the ground. These dry wells are designed to be very shallow (approximately one foot in depth) due to high groundwater throughout the site. The dry wells are designed with an overflow The Berkshire Design Group, Inc. Page 3 ~~ ~~ j North Street Condominiui.__ April 14, 2009 Northampton, Massachusetts Stormwater Drainage Report outlet that allows roof water to sheet flow overland toward the wetlands as it does in existing conditions in larger storms. P-2 P-2 is approximately 0.48 acres in size and is located in the central eastern portion of the site. It contains the front portion of the roof areas from units 15-20 as well as a portion of the new road and grassed areas. The runoff from this area is directed to a rain garden which has been sized to clean and remove pollutants from the stormwater as well as infiltrate it into the ground prior to discharging toward the wetlands. P-3 P-3 is approximately 0.57 acres in size and is located in the eastern part of the site. It contains new pavement, sidewalks, grass, roof areas from units 1-4, and existing wooded areas. Runoff from this area is directed to a catch basin or stone/sod system which pretreats the stormwater prior to entering a rain garden .sized to clean and remove pollutants from the stormwater as well as infiltrate it into the ground prior to discharging toward the wetlands. P-4 P-4 is approximately 1.10 acres in size and is located in the southern part of the site. It contains the majority of the new pavement and the front roof areas from units 5-14 as well as detention basin and walkways. It also contains existing grass and wooded areas along the property line. Roof runoff is directed into dry wells to be infiltrated and the new paved areas are directed into deep sump hooded catch basins, which flow into a stormwater treatment chamber (STC 900) which removes pollutants prior to discharging into the detention basin located adjacent to unit 14. "V. Calculations and Design Drainage calculations were performed on Hydrocad Stormwater Modeling System version 8.0 using Soil Conservation Service (SCS) TR-20 methodology. The SCS method is based on rainfall observations, which were used to develop the Intensity-Duration-Frequency relationship, or IDF curve. The mass curve is a dimensionless distribution of rainfall over time, which indicates the fraction of the rainfall event that occurs at a given time within a 24-hour precipitation event. This synthetic distribution develops peak rates for storms of varying duration and intensities. The SCS distribution provides a cumulative rainfall at any point in time and allows volume dependent routing runoff calculations to occur. These calculations are included in the appendices. The watershed boundaries for calculation purposes are divided according to the proposed site grading and the natural limits of the drainage areas. The curve The Berkshire Design Group, Inc. Page 4 ~~ ~~ North Street Condominiui.~ April 14, 2009 Northampton, Massachusetts Stormwater Drainage Report numbers (CNs) and times of concentration for the existing and proposed subcatchment areas are based on the soil type and the existing and proposed cover conditions at the site. The soil hydrologic group assumed for the site is noted in Figure 3. Watershed subcatchment areas, runoff coefficients and watercourse slopes are based on survey information. Calculations were performed for the 2-, 10-, and 100-year frequency storms under existing and proposed conditions. The results of the calculations are presented in Table 1 on the following page. Appendix A presents the Hydrocad calculations. Flow Rates & Water Quantity In the post development conditions the runoff from the proposed site will be routed to a detention basin located in the south area of the site. The proposed detention basin is composed of both surface and underground storage. There is a pipe and header system connected to the surface detention basin which provides additional storage. The basin will attenuate peak flows up to the 100-Year Storm in proposed conditions through the use of an outlet control structure. Stormwater will be discharged to the wetlands as runoff does in existing conditions. In addition to the detention basin, 8 infiltration systems are proposed (2 rain gardens and 6 dry wells) which will provide a significant reduction in peak flows (through exfiltration); however these systems were not included in the Hydrocad calculations in order to provide a more conservative runoff quantity calculation. Table 1 on the following page presents the comparison of flow rates and water quantity at both existing and proposed control points based solely on the detention basin's attenuation capacity. Table 1 Peak Flow and Volume Summary 2-Year Storm 10-Year Storm 100-Year Storm Condition & Point of 3.00" 4.50" 6.50" Analysis • Peak Flow Volume Peak Flow Volume Peak Flow Volume Rate(cfs) (acre-ft) Rate(cfs) (acre-ft) Rate(cfs) (acre-ft) Existing. - Control Pt. 4.71 0.569 11.07 1.256 21.00 2.346 (E-CP)* Proposed - Controll't. -+.I ~~.-~~~ II.Oh /.-~Ifi ='0.'8s '.~~ti'6 I t'-CP 1" *Names in parentheses refer to HydroCad model and calculations. The Berkshire Design Group, Inc. Page 5 I __ _____ ~.,) North Street Condominiui,__- April 14, 2009 Northampton, Massachusetts Stormwater Drainage Report VI. MADEP Stormwater Standards Compliance The following section details how the project will meet DEP Stormwater Management Policy's ten stormwater management standards. Standard 1 -Untreated Stormwater The proposed stormwater system is designed to treat the new point source ,discharge prior to flowing to the resource area. All new outlets are outfitted with flared ends and erosion protection to prevent any erosion from occurring in the area. See Appendix C for TSS removal summary. Standard 2 -Post-Development Peak Dischar eg Rates The stormwater system is designed so that post-development peak discharge rates are less than pre-development peak discharge rates leaving the site. In order to reduce runoff rates in proposed conditions a detention basin with an outlet control structures is proposed. Note that although 8 infiltration systems are proposed, they are not included in the runoff calculations in order to maintain a more conservative peak discharge rate. Refer to Table 1 Peak Flow and Volume Summary and Appendix A for HydroCAD calculations. Standard 3 - Recharge to Groundwater The proposed site has designed to recharge groundwater to the maximum extent practicable in proposed conditions. The entire site consists of hydrologic group "C" soils and there is very high groundwater throughout most of the site (see Appendix B for test pit logs). The soil conditions caused limitations for infiltration on many areas of the site because the required 2 feet separation from groundwater could not be met. Wherever possible, infiltration has been proposed and approximately 66.4% of the new impervious area will be directed to an infiltration system. The rain garden located between units 19 and 20/21 has been designed to infiltrate the impervious areas located within subcatchment P-2, and the rain garden adjacent to unit 4 has been designed to infiltrate the impervious areas located within subcatchment P-3. In addition to the rain gardens, the new roof areas that are not discharging to a rain garden are connected to a shallow dry well system designed to recharge roof runoff into the ground. Due to restrictions of the site terrain and soil conditions, not all of the impervious area could be directed to an infiltration system, therefore a118 of the infiltration systems are oversized to maximize the amount of infiltration on site. They are designed to hold at least twice the required recharge volume directed to it and still drawdown within 72 hours in order to fully comply with Standard 3 requirements (see Appendix D for recharge calculations). Standard 4 -Water Quality The proposed stormwater management system has been designed to remove the average annual Total Suspended Solids (TSS) load equal to or in excess of 80% The Berkshire Design Group, Inc. Page 6 ~~-~~~ ~~ North Street Condominiui.__ - April 14, 2009 Northampton, Massachusetts Stormwater Drainage Report for the proposed site conditions (see Appendix C for calculations). There are 3 treatment chains proposed: Treatment Train 1(total of 90% TSS removed) The first treatment chain treats the roof areas and paved impervious areas within P-2. The runoff is directed through apre-treatment system consisting of a stone diaphragm and grassed area which discharges into a rain garden which achieves a total annual TSS removal rate of approximately 90%. The water quality basin has been designed to hold a larger volume of water (706cf) than the water quality volume required (463cf) for the impervious area directed to it. Treatment Train 2(total of 90% TSS removed) The first treatment chain treats the roof areas and paved impervious areas within P-3. The runoff is directed through apre-treatment system consisting of a stone diaphragm and grassed area which discharges into a rain garden which achieves a total annual TSS removal rate of approximately 90%. The water quality basin has been designed to hold a larger volume of water (317cf) than the water quality volume required (278cf) for the impervious area directed to it. Treatment Train 3(total of 80% TSS removed) The third treatment chain treats all of the roof areas from the new units. The roof areas are directed into a shallow dry well sized to hold the water quality volume and achieve a total annual TSS removal rate of approximately 80%. Although each of the roof areas are not hydraulically connected, they are considered to be within the same treatment chain as they all utilize the same BMP (dry well). See Appendix C for water quality and BMP sizing calculations. Treatment Train 4(total of 83% TSS removed) The second treatment chain treats the impervious areas from P-4. The runoff is directed into deep sump hooded catch basins (25%TSS removal) and then to a proprietary treatment chamber (*Stormceptor STC 900, 77% TSS removal) which achieves a total TSS removal rate of approximately 83%. *Note: The stormwater treatment chamber has been sized based on MASTEP test evaluations. The attached table in appendix C displays MASTEP evaluated TSS removal rates based on the impervious area directed to the system. In addition to removal of TSS, a Long Term Pollution Prevention Plan has been created to maintain a clean site and ensure that all BMPs are functioning to their maximum potential. See Appendix F for Long Term Pollution Prevention Plan. Standard 5 -Higher Potential Pollutant Loads The proposed project is not expected to yield high potential pollutant loads. The Berkshire Design Group, Inc. Page 7 ~~~ ~~ North Street Condominiums ~ April 14, 2009 Northampton, Massachusetts Stormwater Drainage Report Standard 6 -Protection of Critical Areas The project site does not discharge to critical areas as defined in MA DEP Stormwater Policy Handbook. Standard 7 -Redevelopment Projects The redevelopment of previously developed site standard is not applicable for this project. Standard 8 - Erosion/Sediment Control Erosion and sediment controls have been incorporated into the project design to prevent erosion, control sediments, and stabilized exposed soils during construction and land disturbance. See Appendix G for Construction Period Pollution Prevention and Erosion Sedimentation Control. Standard 9 - Operation/Maintenance Plan An Operation and Maintenance Plan for the proposed project is included in Appendix E. It includes general controls for construction and long term maintenance of the Stormwater management system. Standard 10 -Prohibition of Illicit Discharges No Illicit Discharge Compliance Statement is included with this report however one will be submitted prior to the discharge of any stormwater to post- construction BMPs. VII. Summary The impervious area from existing to proposed conditions will increase by approximately 1.04 acres from the new roadway, walks, walls, and housing units. The proposed Stormwater management system is designed to maintain or reduce the peak flow rates in proposed conditions for the 2-, 10-, and 100-year storm frequencies. Special care has been taken to treat runoff with a series of best management practices to ensure water quality and annual TSS removal rates equal to or in excess of 80%. These methods include deep sump hooded catch basins, rain gardens, dry wells, and a stormwater treatment chamber. VIII. References United States Department of Agriculture. 1998. Soil Survey of Hampshire County (Central Part), Massachusetts. The Berkshire Design Group, Inc. Page 8 r, -~ ~'~, DECLARATION OF COVENANTS AND RESTRICTIONS, EASEMENTS, AND MAINTENANCE AGREEMENTS STORM WATER MANAGEMENT The Obliged Party shall be responsible for the ongoing costs of all storm water management associated with the development in accordance with the Storm Water Management Plan on file with the City of Northampton Department of Public Works. The Obliged Party shall be responsible for full and timely compliance with the Storm Water Management System Operation & Maintenance Plan, as follows: 1) Street Sweepinq Street and parking area sweeping shall take place twice annually. 2) Rain Gardens Two rain garden/bioretention areas have been incorporated into the stormwater system to remove pollutants within the stormwater runoff. Both the pre-treatment stone diaphragm systems and bioretention areas should be inspected monthly for sediment build-up, litter and debris, structural damage and standing water. Inspect soil and repair eroded areas within the bioretention systems monthly and re-mulch void areas as needed. Treat diseased vegetation as needed. Remove and replace dead vegetation twice per year (spring and fall). Remove invasive species as needed to prevent them from spreading into the bioretention area. Replace mulch every two years in the early spring. In the winter, it is important to ensure that snow is not plowed into the rain gardens as this will cause the runoff to bypass the system without proper treatment. 3) Detention Basin (The following recommendations follow the MADEP stormwater Policy guidelines.) Inspections (a) Initial six months of use:. Examine for stabilization and function, including determination of the duration of water standing in the basin, any sediment erosion, excessive compaction of soils, or low spots. (b) Twice per year: Examine basin for the following: differential settlement, cracking, erosion, leakage, or tree growth on embankments, condition of riprap, sediment accumulation, and health of turf where applicable. Any adverse conditions noted during any inspections shall be addressed by repair or reconsideration of design components. -~- Draft Sections of Declaration of Covenants and Restrictions for ConCom 4-15-09.doc ~~ Mowing_and_General Maintenance Occasional mowing (1-2 times per year min.) shall be performed on the side slopes and basin bottom where turf is present. Accumulated grass clippings and/or organic matter and trash and debris shall be removed. Any clogged surface areas can be loosened by deep tilling; tilled areas must be immediately revegetated. Tilling may be used in this manner for no more than two consecutive maintenance periods. Thereafter, sediment in the clogged areas shall be removed, liner material replaced, and revegetation established. Dredging/Sediment Removal Accumulated sediment shall be removed from the basin at five (5) year intervals, or as required to maintain the function of the stormwater management system as designed. During this process and until the disturbed sediment has settled, the outlet pipe shall be sealed so as to minimize the risk of conveying sediment beyond the basin. 4) Grassed Swales Swales shall be mowed at least once per growing season to prevent establishment of woody growth and other undesirable plants that inhibit proper performance. Grass vegetation should not be cut shorter than 4". It is important not to engage in excessive mowing operations, as this keeps the grass too short and decreases the efficiency of the vegetation to reduce runoff borne sediments and velocities. Sediment and debris shall be removed manually at least once per year before the vegetation is adversely impacted. 5) Hooded Catch Basin and/or Drain Manhole with Sump Oil and water separators should be inspected at least four times per year and cleaned annually or more often if required. Oil and sediments should be removed and disposed of in accordance with local, state and federal guidelines and regulations. In the case of an oil or bulk pollutant release, the system must be cleaned immediately following the spill and the proper authorities notified. 6) stormwater Treatment Chambers The stormwater Treatment System requires minimal routine maintenance; however,. it is important that the system be properly inspected and cleaned when necessary in order to function at its best. The rate at which the system collects pollutants will depend more heavily on site activities than the size of the unit, e.g. heavy winter sanding will cause the grit chamber to fill more quickly, but regular sweeping will slow accumulation. The water quality treatment system shall consist of Stormceptor.or equal treatment chambers. For more detail of how the Stormceptor should be maintained see the Stormceptor Owner Manual. -a- Draft Sections of Declaration of Covenants and Restrictions for ConCom 4-15-09.doc ~~ ~i 7) Dry Wells Dry wells basins have been incorporated into the stormwater system for the site to specifically receive roof runoff and, therefore, are not expected to receive large amounts of bulk sediments. Proper maintenance of roof gutters that drain to the system will help to protect the integrity of the infiltration basins. Sediments and debris should be removed and disposed of in accordance with local, state and federal guidelines and regulations. 8) Snow Removal The stormwater management system is designed to accommodate volumes from snow melt. Since plowed snow from paved surface may contain sediment, oils and various pollutants, all snow melt from vehicular areas on the site shall be routed through the drainage system or removed from the site. Snow removed from the site shall be disposed of such that it or its melt will have no adverse effect on other resource areas. Additionally, the Obliged Party shall submit to the Office of Planning and Development annually, no later than November 15th of each year: (1) maintenance reports with documentation on the conditions revealed by all inspections and (2) receipts for all cleaning and work for all items specified in the Inspection and Maintenance Schedule of the Storm Water Management Plan. Each such report shall indicate the status of each element of the Storm Water System covered by the Storm Water Management Plan. The City of Northampton is hereby granted an easement to (a) inspect the Storm Water System and (b) to perform specified maintenance obligations of the Obliged Party, if the City has notified the Obliged Party in writing that specified maintenance obligations must be performed by a date certain and the Obliged Party has failed to perform such maintenance obligations by such date. SNOW REMOVAL AND MANAGEMENT PLAN Snow shall be stockpiled only in the "Snow Melt Trenches" located adjacent to unit 1 and unit 15, as shown on the snow stockpiling plan (see Attachment ##). No snow shall be dumped or stockpiled directly into any resource area or its buffer zone or within any area such that untreated snow melt may enter a resource area. The Obliged Party as the case may be shall not use salt for deicing .anywhere on the site. The Conservation Commission and DPW shall be notified by the Obliged Party where a violation of these requirements occurs. -3- Draft Sections of Declaration of Covenants and Reshictions for ConCom 4-15-09.doc ~' ~\ 1 'i i ~'`1 35-FOOT WETLAND BUFFER NO DISTURB ZONE The 35-foot buffer zone to the bordering vegetated wetlands shall be a No Disturb Zone. Permanent concrete markers set 2 feet above ground level and spaced no more than 25 feet apart, marking the 35-Foot Wetland Buffer No Disturb Zone must remain in place in perpetuity along the entire length of the 35-foot wetland buffer, except around the detention basin and where landscape retaining walls and a footpath along the 35-foot buffer zone are constructed. No activity, other than walking, birding, or other comparable passive recreational activities shall take place within the No Disturb Zone or the wetland resource area. The Obliged Party shall contract with a qualified person, approved by the Conservation Commission, to annually inspect the 35-foot No Disturb Zone. This person shall provide to the Obliged Party and to the Conservation Commission an annual inspection report of (1) the integrity of the permanent markers, (2) the condition of the No Disturb Zone, including, but not limited to, any encroachment, erosion, destruction of vegetation, dumping of waste of any kind, including lawn clippings and other yard waste, and (3) whether any restoration is required. This report shall be submitted to the Conservation Commission by September 1 of each year. The Obliged Party is solely responsible for the cost of the annual inspection and report, as well as any restoration deemed required by the Northampton Conservation Commission. The City of Northampton is hereby granted an easement to (a) inspect the 35- Foot No Disturb Zone and (b) to perform any necessary maintenance and/or restoration obligations of the Obliged Party, if the City has notified the responsible party in writing that specified maintenance and/or restoration obligations must be performed by a date certain and the Obliged Party has failed to perform such maintenance and/or restoration obligations by such date. COMMON OPEN SPACE The Obliged Party is forbidden by Condition ## of the Order of Conditions to use any lawn chemicals on the site. An annual acknowledgement of this requirement by the Obliged Party shall be provided to the Conservation Commission by September 1 of each year. The Common areas and any lawn in the Exclusive Use Areas, will be maintained by the Condominium Association. All landscaping debris will either be mulched or disposed of off site. There shall be no work or dumping allowed in the 35-Foot Wetland Buffer No Disturb Zone. There shall be no structures erected in the said zone, and there. shall be no structures built in the common areas without the written approval of the Condominium Association. 4 Draft Sections of Declaration of Covenants and Restrictions for ConCom 4-15-09.doc !, ESCROW ACCOUNT The Obliged Party shall deposit $5,000.00 in an interest-bearing Escrow Account to assure that the Obliged Party complies fully with its obligations under the Planning Board Decision, the Conservation Commission Order of Conditions, the Stormwater Management Plan, and the 35-Foot Wetland Buffer No Disturb Zone. The City of Northampton (the "City") shall be a co-signer on the account. The funds in the Escrow Account shall be owned by the Condominium Association and interest thereon shall be payable to the Condominium Association once the Condominium is formed; prior to such time the funds will be owned and interest paid to Tofino and Northern. If the City has notified the Obliged Party in writing that specified maintenance, repair, and/or restoration obligations of the Obliged Party under this Declaration and the Planning Board Decision, the Conservation Commission Order of Conditions, the Stormwater Management Plan, and the 35-Foot Wetland Buffer No Disturb Zone must be performed by a date certain and the Obliged Party has failed to perform such maintenance, repair, and/or restoration obligations by such date, the City may expend funds from the said Escrow Account to perform the specified obligations. The City may thereafter assess or bill the Obliged Party for such expenditure in order to replenish and maintain the account at $5,000.00. The Obliged Party shall have ninety (90) days to pay such an assessment and may assess the Unit Owners for their proportionate share of such expenditure. If the Obliged Party fails to pay or reimburse the City for the expenditure within ninety (90) days, the City shall have standing and the right to file an action against the Obliged Party to enforce the assessment, including the right to seek a prejudgment lien or other security for the enforcement of the assessment. -s- Draft Sections of Declaration of Covenants and Restrictions for ConCom 4-15-09.doc t ~~ ~ ~ ~~ ~~ Massachusetts Department of Environmental Protection Bureau of Resource Protection -Wetlands WPA~IForm 2 - Determination. of Applicability Massachusetts Wetlands Protection Act M.G.L.~c. 131, §40 Important: When filling out forms on the computer, use only the tab key to move your cursor - do not use the return key. tab Krum A. General Information From: Northampton Conservation Commission To: Applicant Northern Avenue Homes, Inc and Tofino Associates 31 Campus Plaza Road Mailing Address Hadley MA 01035 CitylTown ~ ~ State Zip Code , Property Owner (if different from applicant): Douolas Kohl Name ' 31 Campus Plaza Road Mailing Address Hadley MA 01035 CitylTown State Zip Code . ; 1: Title and Date (or Revised Date if applicable) of Final Plans and Other Documents: "Topographic" Plan of Land in Northampton, Massachusetts prepared fon August 20, 2007 Northern Avenue Homes, Inc. Date Title Title 2. Date Request Filed: June 20, 2007 B, Determination Date Date Pursuant to the authority of M.G.L. c. 131', § 40, the Conservation Commission considered your Request for Determination of Applicability, with its supporting documentation, and made the following Determination. Project Description (if applicable): . Resource Area Delineation Project Location: Northern Avenue Street Address 25C Assessors Map/Plat Number Northampton City/Town 12 & 17 Parcel/Lot Number wpaform2.doc • Determination of Applicability •'rev. 1016/64 Page 1 of b ~~ Massachusetts Department of Environmental Protection ~ - Bureau of Resource Protection - Wetlands WPA Form 2 --Determination of Applicability i Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 B. Determination (cont.) The following Determination(s) is/are applicable to the proposed site and/or project relative to the Wetlands Protection Act and regulations: Positive Determination Note: No work within the jurisdiction of the Wetlands Protection Act may proceed until a final Order o Conditions (issued following submittal of a Notice of Intent or Abbreviated Notice of Intent) or Order of Resource Area Delineation (issued following submittal of Simplified Review ANRAD) has been received from the issuing authority (i.e., Conservation Commission or the Department of Environmental Protection). ^ 1. The area described on the refof the area equi es the filing of a Noti e of Intentnder the Act. Removing, filling; dredging, or altering ® 2a. The boundary delineations of the following resource areas described on the referenced plan(s) are: confirmed as accurate. Therefore, the resource area boundaries confirmed in this Determination are binding as to all decisions rendered pursuant to the Wetlands Protection Act and.its regulations regarding such boundaries for as long as this Determination is valid. The intermittent stream and wetlands deve been identif d within the afeea showpl as wetlands and confirmed as accurate. Vernal pools ha have not been delineated. ^ 2b. The boundaries of resource areas listed below a.re not confirmed by this Determination, . regardless of whether such boundaries are contained on the plans attached to this Determination or to the Request for Determination. ^ 3. The work de ~ th eACt and will removlenf'tlt dredgec oralter t lat alrea. Thereforeu said work protection un requires the filing of a Notice of Intent. ^ 4. The work described on referenced plan(s) grid The eforet(said wlork requres the fil rig of swill alter an Area subject to protection under the Act. . Notice of Intent or ANRAD Simplified Review (if work'is limited to the Buffer Zone). ® 5. The area and/or work described on referenced plan(s) and document(s) is subject to review and approval~by: Cit of Northampton Name of Municipality Pursuant to the following municipal wetland ordinance or bylaw: Chapter 33.7 of the Code of- Northam ton Wetlands Ordinance - Ordinances Name - Page 2 of 5 ~_.__.,.__..~....._-.,,.. ~n~ama ~ ~ ~ ,, _- Massachusetts Department of Environmental Protection Bureau.. of Resource Protection -Wetlands . ' WPA Form 2 -Determination of Applicability Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 B. Determination (cont.`) ^ 6. The following area and/or work, if any, is subject to a municipal ordinance or bylaw but not subject to the Massachusetts Wetlands Protection Act: ^ 7. If a Notice of Intent is filed for the work in the Riverfront Area described on referenced plan(s) and document(s), which includes all or part of the work described in the Request, the applicant must consider the following alternatives. (Refer to the wetland regulations at 10.58(4)c. for more . information about the scope of alternatives requirements): ^. Alternatives limited to the lot on which the project is located. 4' ^ • Alternatives limited to the lot on which'the project is located, the subdivided lots, and any adjacent lots formerly or presently owned by the same owner. ~ ^ Alternatives limited to the original parcel on which the project is located, the subdivided parcels, any adjacent parcels, and any other land which can reasonably be obtained within the municipality. ^ Alternatives, extend to any sites which can reasonably be obtained within the appropriate region.of the state.. - Negative Determination . Note: No further action under the Wetlands Protection Act is required by the applicant. However, if the Department is requested to issue a Superseding Determination of Applicability, work -may not proceed on this project unless-the Department fails to act on such request within 35 days of the date the ,,:f request is post-marked for certified mail or hand delivered to the Department. Work may then proceed at the owner's risk only upon notice to the Department and to the Conservation Commission. Requirements for requests. for Superseding Determinations are listed at the end of this document: ^ 1. The area described in the Request is not an area subject to protection under the Act or the Buffer Zone. ^ 2. The work described in the Request is within an area subject to protection under the Act, but-will not remove, fill, dredge, or alter that area. Therefore, said work does not require the filing of e Notice of Intent. ^ 3. The work described in the Request is within the Buffer Zone, as defined in the regulations, but will not alter an Area subject to protection under the Act. Therefor, said work does not require the filing of a Notice of Intent, subject to the following conditions (if any). ^ 4. The work described in the Request is not within an Area subject to protection under the Act . (including the Buffer Zone). Therefore, said work does not require the filing of a Notice of Interit, unless and until said work alters an Area subject to protection under the Act. wpaform2.doc • Determination of Applicability • rev. 10/6104 ~ Page 3 of 5 ~~ 9Vlassachusetts Department of Environmental Protection Bureau of Resource Protection -Wetlands VIIPA F®rm 2 - ®eterminati®n ®f AppBicability Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 B. ®eterr~ination (cont.) ^ 5. The area described in the Request is subject to protection under the Act. Since the work described therein meets the requirements for the following exemption, as specified in the Act and' the regulations, no Notice of Intent is required: Activity (site applicable statuatorylregulatorypiovisions) ^ 6. The area and/or work described in the Request is not subject to review and approval by: Name of Municipality Pursuant to a municipal wetlands ordinance or bylaw. Name C. Authorization This Determination is issued to the applicant and delivered as follows: ~ by hand delivery on ~~~ a~ . 3..007 Date ~. Ordinance or Bylaw Citation ^ by certified mail, return receipt requested on Date This Determination is valid for three years from the date of issuance (except Determinations for Vegetation Management Plans which are valid for the duration of the Plan). This Determination does not relieve the applicant from complying with all-other applicable federal, state, or local statutes, ordinances, bylaws, or regulations. This Determination must be signed by a majority of the Conservation Commission. A copy must be sent to the appropriate DEP Regional Office (see http://www.mass.aov/dep/about/reaion.findyour htm) and the property owner (if different from the applicant). ~~U a3 , aoo7 Date wpaform2.doc • Determination of Applicability • rev.10/6/04 page 4 of 5