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FEMA-2019 07 12 HMGP Application_Ice PondMEMA-DCR Grant Sub-Application Hazard Mitigation Grant Program (HMGP) HMGP-4372-MA HMGP-4379-MA Ice Pond Resiliency Improvements Northampton, Massachusetts July 12, 2019 Sub-Applicant: City of Northampton, MA Office of Planning & Sustainability 210 Main Street, Room 11 Northampton, Massachusetts 01060 GZA GeoEnvironmental, Inc. 1350 Main Street, Suite 1400 │ Springfield, MA 01103 413.726.2100 31 Offices Nationwide www.gza.com Damages to Rocky Hill Road (State Route 66) caused by uncontrolled overflow from Ice Pond April 16, 2007 Photo credit: Northampton DPW 1 Grant Sub-Application Package for the Hazard Mitigation Grant Program (HMGP) HMGP-4372-MA HMGP-4379-MA Revised: September 2018 This package has been developed to assist prospective Sub-Applicants in the preparation of Hazard Miti- gation Grant Program (HMGP) Sub-Applications. The package outlines the specific information required for the State and Federal government to review proposed mitigation activities. Should assistance be required in the preparation of your Sub-Application, contact one of the State Mitiga- tion Team members (listed on page 10 of this instruction packet). The State has established two deadlines for complete grant applications: JANUARY 4, 2019: Applications for hazard mitigation projects and hazard mitigation planning, submitted by January 4, 2019, will be reviewed and, if appropriate, recommended to FEMA for early funding. Also advanced assistance applications will be only considered at this time. Advance Funding: These applications must meet all HMA program requirements, have a complete application package, and display strong commitment for implementation at the time of award. Advance Assistance: Sub-applicants may apply for an Advance Assistance grant to prioritize, se- lect, and develop complete HMGP applications in a timely manner. (EX: Benefit Cost Analysis data collection, etc.) A full list of activities eligible for Advance Assistance can be found in the Hazard Mitigation Assistance Guidance (ver. 2/27/2015) on page 108. APRIL 4, 2019: The second application deadline of April 4, 2019 is for those projects and plans that need additional refinement and application development work before an application can be submitted. This will be the final deadline for submission of applications under this grant program. A completed application package will include: 1.One (1) complete electronic copy of the Sub-Application in Word or PDF (this can be submitted on CD, thumb/flash drive, or if under 10MB emailed to: mitigation@mass.gov 2.One (1) Benefit-Cost Analysis Version 5.3.0 Program export (submit both .zip file and .pdf file) 2 Contents ........................................................................................................................................................... Page Exhibit A: Sub-Application Cover Sheet ................................................................................................................ 3 Sub-Application Completion Checklist ................................................................................................................... 5 Exhibit B. Scope of Work ....................................................................................................................................... 6 Exhibit B-1. Project Photographs ..................................................................................................................... 10 Exhibit B-2. Project Maps and Floodplain Location Map (FIRMette) ............................................................... 16 Exhibit B-3. Project Drawings ......................................................................................................................... 21 Exhibit B-4. Alternatives ................................................................................................................................. 33 Exhibit C. Work Schedule ................................................................................................................................... 34 Exhibit D: Project Cost Estimate Worksheet ......................................................................................................... 35 Exhibit E: Environmental Compliance Information .............................................................................................. 38 Exhibit F. Benefit-Cost Analysis (BCA) Information ............................................................................................ 42 Exhibit G. Elevation and Acquistion Documentation Package .............................................................................. 68 Exhibit K. General Conditions ............................................................................................................................. 69 Exhibit L. Funding Commitment ......................................................................................................................... 70 Exhibit M. Maintenance Agreement ..................................................................................................................... 71 Exhibit N. FEMA Assurances Package ................................................................................................................ 72 Exhibit O. Miscellaneous Attachments ................................................................................................................. 81 3 EXHIBIT A: SUB-APPLICATION COVER SHEET Sub-Application Information Sub-Applicant __City of Northampton, MA __________________________________________ County __Hampshire________________________________ Congressional District __District 2_____________ Fed Tax ID __04-6001406_____________________ FIPS Code ___13583_______________________ DUNS Number _079217444_________________________ Community in good standing with the National Flood Insurance Program? ____X____Yes ________No Project Title _ Ice Pond Resiliency Improvements_________________________ Authorized Applicant Agent1 Point of Contact2 David J. Narkewicz Name Wayne Feiden Mayor Title Director Planning & Sustainability 413-587-1249 Telephone # 413-587-1265 Northampton City Hall Address 1 Northampton City Hall 210 Main Street, Room 12 Address 2 210 Main Street Northampton, MA 01060 City, State Zip Northampton, MA 01060 mayor@northamptonma.gov Email wfeiden@northamptonma.gov Are all of the Exhibits complete and attached to the application as required? ____X____Yes ________No Project Type: ___Infrastructure Retrofit Project_____________________________________________ (From 2015 HMA Guidance, Part III, Table 3.) Introductory Statement (Brief Summary of Project): The Ice Pond (aka. Rocky Hill Pond) refers to a former pond located on the north side of Rocky Hill Road (State Route 66), about one mile west of downtown Northampton, Massachusetts. The former pond basin receives flow from a 400± acre watershed and has one perennial tributary, known as Rocky Hill Pond Brook. The pond was con- structed in the early 1890s to supply ice for the Norwood Ice Company. The pond was abandoned as an ice source in the early 1930s, although the original impounding embankment and the spillway infrastructure remains in place. Cur- rently, under normal dry-weather conditions, the former pond does not impound water. The former low-level outlet pipe functions as a throttling device on Rocky Hill Pond Brook and the other sources of runoff entering the pond basin, thus providing detention storage, flow attenuation, and flood risk reduction for downstream areas. Current provisions for operations and maintenance are minimal and in dire need of improvement to protect worker safety and facilitate maintenance before, during, and after significant runoff-producing events. The goals of the Ice Pond Resiliency Improvements project are: 1.Provide for improved performance of the debris grating at the low-level outlet a.Maintain protection of the public should individuals be caught in the flow b.Screen out large debris that might interfere with the outlet capacity but that will avoid clogging c.Facilitate safe debris removal 2.Provide for improved and safe access to the low-level outlet and the high-level spillway outlet for operations and maintenance before, during, and after significant runoff-producing events 1 Individual authorized to sign certification (i.e. Contractor Authorized Signatory Listing) 2 Individual that the sub-applicant wishes the State (MEMA/DCR) to contact/email for additional information/questions regarding the sub-application (i.e. primary point of contact) 5 TITLE: CONSTRUCTION OF ICE POND OUTLET IMPROVEMENTS SUB-APPLICATION COMPLETION CHECKLIST Project Sub-Application Task Referenced Information Location MEMA Review FEMA Re- view Exhibit A - Sub-Applicant Cover Sheet 3-4 Exhibit B - Scope of Work (SOW) 6-33 Statement of Need/Activity Description 6-9 Exhibit B-1 - Project Photographs 10-15 Exhibit B-2 - Project Maps 16-20 Exhibit B-3 - Project Drawings 21-32 Exhibit B-4 - Alternatives #1 & #2 33 Exhibit C - Work Schedule 34 Exhibit D - Project Cost Estimate Worksheet 35-37 Exhibit E - Environmental\Historic Preservation Compliance Information Worksheet 38-41 Exhibit F - Benefit Cost Analysis 42-67 Exhibit F-1 - Benefit Cost Narrative/Report 43-50 Exhibit F-2 - Benefit-Cost Ratio .zip and .PDF file 51 Exhibit F-3 - Back Up Data Documentation Provided 52-67 Exhibit G – Elevation and Acquisition Documentation 68 (N/A) Exhibit K - General Conditions (Signature Required)69 Exhibit L - Funding Certification (Signature Required)70 Exhibit M - Maintenance Agreement (Signature Required)71 Exhibit N - FEMA Assurances Package (Signature Required)72-77 Contractor Authorized Signatory Listing (CASL) (Signature Required)78 Subrecipient Pre-Award Risk Assessment Questionnaire (SPARQ) (Signature Required)79-80 Exhibit O – Miscellaneous Attachments 81 For Property Acquisition/Relocation/Elevation Documentation Package, the below is required in addition to what is required for a Project. Substantial Damage Letter N/A Elevation Certificate N/A Statement of Voluntary Interest Form N/A Model Deed N/A Tax Assessor Card N/A 6 EXHIBIT B. SCOPE OF WORK Introduction The Ice Pond (aka. Rocky Hill Pond) refers to a former pond located on the north side of Rocky Hill Road (State Route 66), between the Hampshire County Jail and the Ice Pond Drive residential subdivision in Northampton, Massachusetts. The historical pond receives flow from a 400± acre watershed and has one perennial tributary, known as Rocky Hill Pond Brook. The pond was constructed in the early 1890s to supply ice for the Norwood Ice Company. The pond was abandoned as an ice source in the early 1930s, although the original impounding embankment and the spillway infrastructure remains in place. Currently, under normal dry-weather conditions, the former pond does not impound water. Rather, flows from Rocky Hill Pond Brook and other sources of runoff entering the pond basin are allowed to exit and pass through the embankment via a 16-inch diameter pipe that discharges into a riser structure that is connected to a 6-ft x 5-ft box culvert beneath Rocky Hill Road. At the top of the riser structure is a secondary, high-level spillway outlet, with a 8-ft x 4-ft vertical rectangular opening (drop inlet). The box culvert beneath Rocky Hill Road was constructed by the City of Northampton in 1924, following a spring freshet that caused the former dam to overtop. As reported in The Springfield Republican on April 24, 1924: “Rocky Hill brook brought so much pressure against the dam of Rocky Hill pond that the dam was broken down, and the tumbling waters washed out a broad gulch in the neigh- boring roadway of the Northampton Easthampton highway.” The 16-inch pipe and the high-level spillway outlet are believed to be infrastructure associated with the former functioning ice pond. During current hydrologic events causing significant flows in Rocky Hill Pond Brook, the 16-inch outlet pipe acts as a throttling device, and water is temporarily impounded within the footprint of the former pond. This throttling effect protects downstream areas from flooding, scouring flows, and high volumes of runoff. If the 16-inch pipe becomes clogged or if inflows are excessive, rising water within the pond may also discharge through the former high-level spillway outlet. Thus, the former pond essentially acts as a detention basin and mitigates peak flow rates downstream of Rocky Hill Road. The 16-inch low-level outlet is covered with a simple clog-prone grating to prevent debris from getting into the system and also, presumably, for human safety purposes. The grating is typically observed on at least a monthly basis. Access for inspection and maintenance is difficult and represents a safety risk, especially when the brook is flowing full or when waters begin to rise within the former pond. Further, high flow events typically carry leaves and organic debris from the mostly-wooded watershed, clogging the low-level outlet grate and posing a major flood risk. The Ice Pond overflowed across Rocky Hill Road during a significant storm in April 2007, which dropped approximately 4 inches of rain according to Westfield Barnes Airport precipitation data. This event caused damages to the roadway infrastructure, including a washout of the southern (downstream) roadway shoulder and exposure of underground utilities (see photo- graph on the cover of this HMGP Sub-Application). Fortunately, the raging waters receded prior to more extensive damage to the exposed utilities. The Ice Pond Resiliency Improvements project has been conceived and designed by the City of Northamp- ton pursuant to a grant received from the Commonwealth of Massachusetts’ Municipal Vulnerability Program (MVP) Action Grant Award for a comprehensive program entitled “Northampton Designs with Nature to Reduce Storm Damage.” The early work of implementing the MVP grant was to identify areas throughout the City of Northampton that are experiencing recurrent damages associated with storm impacts. The planned improvements at Ice Pond were identified as Project No. 10 of the “Northampton Designs with Nature to Reduce Storm Damage” program. Engineering design and permitting have been provided for under the MVP grant, and the City of Northampton is currently seeking assistance from the HMGP to construct the improvements, including bidding and designer services during construction. 7 The scope of work for the proposed Ice Pond Resiliency Improvements Project includes construction of improvements to the low-level outlet and its surroundings, to provide safe access for maintenance, to im- prove flow conditions during all storm events, and to continue providing for the protection of human health and safety and downgradient infrastructure. The design includes a retrofit of the low-level outlet to provide an inclined bar grating and including new accessways to facilitate safe and effective access to the low-level outlet and high-level spillway outlet for maintenance before, during, and after storm events. The overall detention capacity of the former pond will be maintained. The inclined bar grating at the low-level outlet will allow for the accumulation of some debris without significantly blocking the ability of the structure to pass flow. Bar grating design has incorporated the recommendations of the Federal Highway Administra- tion’s Hydraulic Engineering Circular (HEC) 9 – Debris Control Structures. In addition, the configuration will allow for debris removal by raking upward from the top of the structure and will provide direct access to both outlets for powered machinery and small dump trucks or other appropriate vehicles for removing accumulated debris. Statement of Need As previously mentioned, the former Ice Pond basin provides detention storage, flow attenuation, and flood risk reduction for downstream areas. Safe and effective access for operation and maintenance of this infra- structure is lacking, and current debris screening provisions are inadequate and counter-productive. The proposed project seeks to establish safe and effective access and to improve the low-level outlet debris screening by the installation of an appropriately-designed debris control structure. The proposed improve- ments at Ice Pond were identified as Project No. 10 of the “Northampton Designs with Nature to Reduce Storm Damage” program, which provided for the design and permitting of the project. The City of North- ampton is currently seeking HMGP assistance for the construction of these important improvements. Consistency with Current Hazard Mitigation Plan and Municipal Vulnerability Preparedness Pro- cess The City of Northampton’s 2015 Multi-Hazard Mitigation Plan (HMP) identifies Ice Pond as a location in the City that floods frequently but is outside of the community’s Flood Insurance Rate Map boundaries. The HMP also identified a mitigation strategy that involves working with the Ice Pond Homeowners’ As- sociation to address the flooding risk. Floods are identified as a specific natural hazard in the HMP. As such, the proposed Ice Pond Resiliency Improvements Project is consistent with the goals, strategies, and recommended prioritized actions outlined in the City’s HMP. The City of Northampton is a designated Municipal Vulnerability Preparedness (MVP) Community. The design and permitting of the Ice Pond Resiliency Improvements Project was funded by a MVP Action Grant, which was awarded to the City of Northampton in the Spring of 2018. Proposed Project As mentioned above, the Ice Pond Resiliency Improvements project has been conceived and designed by the City of Northampton pursuant to a grant received from the Commonwealth of Massachusetts’ Municipal Vulnerability Program (MVP) Action Grant Award for a comprehensive program entitled “Northampton Designs with Nature to Reduce Storm Damage.” The early work of implementing the MVP grant was to identify areas throughout the City of Northampton that are experiencing recurrent damages associated with storm impacts. The planned improvements at Ice Pond were identified as Project No. 10 of the “North- ampton Designs with Nature to Reduce Storm Damage” program. Engineering design and permitting have been provided for under the MVP grant, and the City of Northampton is currently seeking assistance from the HMGP to construct the improvements, including bidding and designer services during construction. 8 The genesis and basis of the Ice Pond Resiliency Improvements project is perhaps best described in the Conceptual Design Summary (GZA, March 15, 2019) prepared under the MVP grant. Excerpts from the summary report are included in Exhibit B-3. Project Drawings. A summary of the tasks required to carry out the work for construction of the proposed Ice Pond Resiliency Improvements project is as follows. Task 1: Project Initiation: The City will initiate the project by completing the following objectives: Finalize the contract for the project with the Massachusetts Emergency Management Agency (MEMA) Issue Request for Proposals for Engineering Services and engage a Consultant for assistance with construction bidding (public procurement) and engineering services during construction for the Project. Upon initiation of the State contract, a kick-off meeting will be held by the City of Northampton with the MEMA Grants Specialist to address the following: o Confirm the project scope of work for the project, o Discuss the schedule and budget to make sure both are consistent with the grant application o Conduct a site visit to document the existing conditions of the site and discuss the tasks and methods for carrying out the work for the project Task 2: Project Management and Resources: The City of Northampton’s Director of Planning and Sus- tainability will serve as the point of contact and Project lead for this project. The Director will manage the day-to-day oversight of the project to ensure that all quarterly reports and invoices are made to MEMA on a timely basis. Additional staff and resources will be provided by the Northampton Department of Public Works that will include but not be limited to: administrative support related to contract management, grant reporting, public notices, project team meetings, and other activities related to project development as iden- tified in Tasks 3 through 6, below. The City will also provide meeting spaces for meetings outlined in the SOW. Task 3: Appraisals & Easements: The Northampton Planning and Sustainability Department will coor- dinate with the City Legal Counsel to secure the necessary easements or rights of entry and access to private property for construction of the project. Task 4: Contractor Procurement: With the assistance of its engineering consultant, the City of North- ampton will prepare a detailed Project Manual, with complimentary drawings and specifications, and issue an invitation for bids to engage a licensed contractor to perform the construction work. The Northampton Department of Public Works will oversee the bidding and construction process. The construction contract will be awarded to the lowest responsible, responsive bidder. Task 5: Construction: With the assistance of its engineering consultant, the City of Northampton’s De- partment of Public Works will oversee the construction process. The engineering consultant will assist with construction administration and periodic construction observation, attendance at project meetings, ma- terial testing, item and quantity confirmation, submittal and as-built drawing reviews, etc. As follows is the anticipated construction sequence. Mobilization Installation of sediment and erosion controls Site preparation Control & diversion of water Excavation at existing channel and mouth of low-level outlet conduit 9 Installation of precast or cast-in-place cement concrete debris rack structure, including galvanized steel debris racks Construction of cast-in-place cement concrete wingwalls and mass-block low retaining walls to bring adjacent areas to future grade for maintenance access Backfill and grading of accessways Construction of gravel and bituminous-concrete paved accessways Loam and seed Installation of fencing and gates Removal of sediment and erosion controls Task 6: MEMA Compliance Review and Close-out: At the conclusion of the project, the Northampton Planning and Sustainability Department will coordinate a final site visit with MEMA to confirm all work was satisfactorily performed per the scope of work included in the grant application. Upon construction final completion, the City of Northampton will pay the final payment in full, submit for final reimbursement and draft a project closeout letter for submission to MEMA. After the close-out of this project, the Northampton Department of Public Works presents the following maintenance schedule for the useful life of the project. Maintenance Schedule: The Northampton Department of Public Works will integrate the inspection and maintenance of the newly constructed Ice Pond resiliency Improvements into the existing maintenance procedures for the entire City infrastructure. The maintenance plan will include the following tasks for the useful life of the project. On a monthly basis and immediately before and during significant runoff-producing events, the Northampton Department of Public Works will inspect the Ice Pond low-level outlet trash rack and the high-level spillway outlet and arrange for the removal and disposal of debris as needed. Bi-annually, the Northampton Department of Public Works will remove unwanted vegetation from the areas immediately adjacent to the outlet trash racks and accessways. The annual maintenance costs associated with this maintenance schedule are estimated to be $1,500/year. 10 Exhibit B-1. Project Photographs Exhibit B-1 includes photographs of the proposed Project area. Photos 1-9 below depict existing con- ditions at the Ice Pond facility including the low-level outlet and the high-level spillway outlet, and past damages at Rocky Hill Road (State Route 66). Photograph dates and credits are indicated. The drawing below is excerpted from Exhibit B-3 and is used to identify the aspect and locations where each of the photographs were taken in the project area (as shown with numbered arrows). # 4 11 Photo 1. Rocky Hill Pond Brook as it enters the Ice Pond’s low-level outlet, showing rudimentary five-sided debris rack (ca. October 2007; NDPW) Photo 2. Rocky Hill Pond Brook as it enters the Ice Pond’s low-level outlet, showing rudimentary five-sided debris rack (ca. October 2007; NDPW) 12 Photo 3. Rocky Hill Pond Brook as it enters the Ice Pond’s low-level outlet, showing excessive accumulations at the debris rack two days following overtopping of embankment and damages to Rocky Hill Road (April 18, 2007; NDPW) Photo 4. Damages to Rocky Hill Road following embankment overtopping at Ice Pond (April 16, 2007; NDPW) 13 Photo 5. Damages to Rocky Hill Road following embankment overtopping at Ice Pond (April 16, 2007; NDPW) Photo 6. Debris occlusion of low-level outlet from Ice Pond (December 7, 2018; GZA) 14 Photo 7. Debris occlusion of low-level outlet from Ice Pond (April 29, 2019; GZA) Photo 8. High-Level Spillway Outlet from Ice Pond (December 7, 2018; GZA) 15 Photo 9. View of Ice Pond basin from the top of the impounding embankment, with Rocky Hill Pond Brook flowing towards the viewer (December 7, 2018; GZA) 16 Exhibit B-2. Project Maps and Floodplain Location Map (FIRMette) Exhibit B-2 includes the following project maps showing the project area: Figure 1. Site Location Map (Locus Map) Figure 2. FIRMette Figure 3. National Wetlands Inventory Map Figure 4. Wetlands Area ICE POND RESILIENCY IMPROVEMENTS ROCKY HILL ROAD (RTE. 66)NORTHAMPTO N, MA 07/12/2019 TEJ JRC 15.0166700.00 RFS JRC DMN 1 in = 2,000 ft CITY OF NORTHAMPTON210 MAIN STREET,NORTHAMPTON, MA 01060 1 0 2,000 4,0001,000 SCALE IN FEET © 2019 - GZA GeoEnvironmental, Inc. J:\0 166700 - 0 166799\15.0166700.00 Northampton Green Infrastructure Designs\GIS\mxd\Ice Pond\Locus_Map.mxd, April 11, 2019 - 3:15:44 PM, jacquelyn.claverLOCUS MAP FIGURE Service Layer Credits: Copyright:© 2013 National Geographic Society, i-cubed© 2019 Microsoft Corporation © 2019 DigitalGlobe ©C NES (2019) Distribution Airbus DS © 2019 HERE DESIGN ED BY: PR OJ MG R: DATE: REVIEW ED BY: DRAW N BY: PR OJECT NO : SC ALE: CHECKED BY: PR EPARED FO R: REVISION NO: PR EPARED BY: 4 GZA GeoEnvironmental, Inc.Engineers and Scientistswww.gza.com TRANSFER, REUSE, OR MODIFICATION TO THE DRAWING BY THE CLIENT OR OTHERS, WITHOUT THE PRIOR WRITTEN UNLESS SPECIFICALLY STATED BY WRITTEN AGREEMENT, THIS DRAWING IS THE SOLE PROPERTY OF GZAGEOENVIRONMENTAL, INC. (GZA). THE INFORMATION SHOWN ON THE DRAWING IS SOLELY FOR THE USE BY GZA'SCLIENT OR THE CLIENT'S DESIGNATED REPRESENTATIVE FOR THE SPECIFIC PROJECT AND LOCATION IDENTIFIED ONTHE DRAWING. THE DRAWING SHALL NOT BE TRANSFERRED, REUSED, COPIED, OR ALTERED IN ANY MANNER FORUSE AT ANY OTHER LOCATION OR FOR ANY OTHER PURPOSE WITHOUT THE PRIOR WRITTEN CONSENT OF GZA, ANY EXPRESS CONSENT OF GZA, WILL BE AT THE USER'S SOLE RISK AND WITHOUT ANY RISK OR LIABILITY TO GZA. Project Location 17 FIGURE 2 -NATIONAL FLOOD HAZARD LAYER FIRMETTE PROJECT AREA 18 Figure 3 U.S. Fish and Wildlife Service, National Standards and Support Team,wetlands_team@fws.gov Wetlands Estuarine and Marine Deepwater Estuarine and Marine Wetland Freshwater Emergent Wetland Freshwater Forested/Shrub Wetland Freshwater Pond Lake Other Riverine July 10, 2019 0 0.06 0.120.03 mi 0 0.1 0.20.05 km 1:3,642 This page was produced by the NWI mapperNational Wetlands Inventory (NWI) This map is for general reference only. The US Fish and Wildlife Service is not responsible for the accuracy or currentness of the base data shown on this map. All wetlands related data should be used in accordance with the layer metadata found on the Wetlands Mapper web site. 19 !(!(!(!( "Cé "Cé "Cé "Cé "Cé "Cé "Cé"Cé "Cé "Cé "Cé "Cé "Cé "Cé "Cé "Cé "Cé"Cé "Cé "Cé "Cé "Cé "Cé "Cé "Cé "Cé "Cé"Cé "Cé "Cé "C¢ "C¢ "C¢ "C¢ "C¢ "C¢ !!2 !!2 !!2 !!2 !!2 !!2 !!2 !!2 !!2 !!2 ##### R O C K Y H I L L R O A D H A MP S H I R E C O U N T Y J A IL WF-D-1 WF-D-2 WF-D-3 WF-D-4 WF-D-5 WF-D-6 WF-D-7 WF-D-8 WF-D-9 WF-D-10 WF-D-11 WF-D-12 WF-D-13 WF-D-14 WF-D-20WF-D-21 WF-D-22WF-D-23 WF-D-24 WF-D-25 WF-D-30 WF-D-31 WF-D-32 WF-D-33 WF-D-34 WF-INLET WF-RA-2-1WF-RA-2-2 WF-RA-2-3 WF-RA-2-4 WF-RA-2-5 WF-RA-2-6WF-RA-2-7 WF-RA-2-8 WF-RA-2-9 WF-RA-2-10 WF-RA-2-11 WF-RA-2-12 WF-RA-2-13WF-RA-2-14 WF-RA-2-15 WF-RA-2-16 LEGEND City of Northampton ParcelLines !!2 Manhole "C¢Culvert "Cé Catch Basin Pipe !(Outfall Streams BVW MAHW 100' Buffer 200' Riverfront Area Bank/Intermittent Est. MAHW Est. Wetland Boundary MAHWL Wetland Boundary Wetland Flags © 2019 - GZA GeoEnvironmental, Inc. J:\0 166700 - 0 166799\15.0166700.00 Northampton Green Infrastructure Designs\GIS\mxd\Not Used\700.00_SurveySites_8x11.mxd, February 06, 2019 - 10:06:18 AM, nathaniel.gosselinService Layer Credits: USGS COLO R ORTHO 2014; MOSAIC 31 UTM 18N; MASS GIS 4 NORTHAMPTON DESIGNS WITH NATURENORTHAMPTON, MA 02/06/2019 NYA NJG 15.0166700.00 RTS RTS RTS 1 in = 100 ft 0 100 20050 SCALE IN FEET WETLANDS AREAICE POND - ROCKY HILL ROAD SITE 10DESIGNED BY: PR OJ MGR: DATE: REVIEW ED BY: DRAW N BY: PR OJECT NO: SC ALE: CHECKED BY: PR EPARED FOR: REVISION NO: PR EPARED BY: GZA GeoEnvironmental, Inc.Engineers and Scientistswww.gza.com TRANSFER, REUSE, OR MODIFICATION TO THE DRAWING BY THE CLIENT OR OTHERS, WITHOUT THE PRIOR WRITTEN UNLESS SPECIFICALLY STATED BY WRITTEN AGREEMENT, THIS DRAWING IS THE SOLE PROPERTY OF GZAGEOENVIRONMENTAL, INC. (GZA). THE INFORMATION SHOWN ON THE DRAWING IS SOLELY FOR THE USE BY GZA'SCLIENT OR THE CLIENT'S DESIGNATED REPRESENTATIVE FOR THE SPECIFIC PROJECT AND LOCATION IDENTIFIED ONTHE DRAWING. THE DRAWING SHALL NOT BE TRANSFERRED, REUSED, COPIED, OR ALTERED IN ANY MANNER FORUSE AT ANY OTHER LOCATION OR FOR ANY OTHER PURPOSE WITHOUT THE PRIOR WRITTEN CONSENT OF GZA, ANY EXPRESS CONSENT OF GZA, WILL BE AT THE USER'S SOLE RISK AND WITHOUT ANY RISK OR LIABILITY TO GZA. FIGURE4 EXCERPTED FROM: 20 21 Exhibit B-3. Project Drawings The drawings included in this section show the location of the proposed components of the Ice Pond Resiliency Improvements project. Also included is a topographic survey of existing conditions along the brook and streets in the project area. In 2018, the City of Northampton received a Commonwealth of Massachusetts’ Municipal Vulnerabil- ity Program (MVP) Action Grant to develop a comprehensive program entitled “Northampton Designs with Nature to Reduce Storm Damage.” The early work of implementing the MVP grant was to identify areas throughout the City of Northampton that are experiencing recurrent damages associated with storm impacts. The planned improvements at Ice Pond were identified as Project No. 10 of the “North- ampton Designs with Nature to Reduce Storm Damage” program. The following pages are excerpted from the Conceptual Design Summary (GZA, March 15, 2019) prepared under the MVP grant. CONCEPTUAL DESIGN SUMMARY NORTHAMPTON DESIGNS WITH NATURE TO REDUCE STORM DAMAGE PREPARED FOR: PLANNING & SUSTAINABILITY PREPARED BY: in conjunction with: March 15, 2019 File No. 15.0166700.00 Copyright© 2019 GZA GeoEnvironmental, Inc. Elm Street Brook;December 21, 2018 22 Note:this page has been excerpted from the "Conceptual Design Summary -Northampton Designs with Nature to Reduce Storm Damage"report,dated March 15,2019,and prepared under an MVP action grant. TABLE OF CONTENTS INTRODUCTION ................................................................................................................................................................................. 1 PROJECT 1 - KING STREET BROOK FLOOD CONTROL BERM ................................................................................................................ 3 PROJECT 2 - JACKSON STREET ELEMENTARY SCHOOL STORMWATER RETROFITS .............................................................................. 6 PROJECT 3 - ADARE PLACE OUTLET IMPROVEMENTS AND STREAM CHANNEL RESTORATION ......................................................... 11 PROJECT 4 - SMITH VOCATIONAL AND AGRICULTURAL HIGH SCHOOL BIORETENTION .................................................................... 14 PROJECT 5 - ELM STREET BROOK FLOOD MITIGATION ..................................................................................................................... 18 PROJECT 6 - HISTORIC MILL RIVER – OLD SOUTH STREET OUTFALLS ................................................................................................ 22 PROJECT 7 - HISTORIC MILL RIVER – PLEASANT STREET OUTFALLS .................................................................................................. 26 PROJECT 8 - INDUSTRIAL DRIVE ROTARY STORMWATER RETROFIT ................................................................................................. 30 PROJECT 9 - INDUSTRIAL DRIVE CHANNEL IMPROVEMENTS (SPACES FOR RENT) ............................................................................ 34 PROJECT 10 - ICE POND OUTLET IMPROVEMENTS ........................................................................................................................... 36 PROJECT 11 - NORTH FARMS ROAD / BROAD BROOK CULVERT UPGRADE ...................................................................................... 39 APPENDICES APPENDIX A Limitations APPENDIX B Graphical Legend APPENDIX C Conceptual Design Assessment Matrix APPENDIX D Wetland Delineation Figures APPENDIX E Full Conceptual Design Figures APPENDIX F Engineer’s Conceptual-Level Opinions of Project Construction Cost 23 Note:this page has been excerpted from the "Conceptual Design Summary -Northampton Designs with Nature to Reduce Storm Damage"report,dated March 15,2019,and prepared under an MVP action grant. Northampton Designs with Nature Conceptual Design Summary Page 1 INTRODUCTION The City of Northampton (the City), through its Office of Planning & Sustainability, was the recipient of an “Action Grant” from the Massachusetts Municipal Vulnerability Preparedness (MVP) Program, for the “Northampton Designs with Nature to Reduce Storm Damage” program. GZA was retained by the City of Northampton to provide engineering services asso- ciated with implementation of the grant, with a scope of work that includes the design (both concept-level and final de- sign) and permitting of green infrastructure to detain, retain, and treat stormwater using nature-based solutions. The Massachusetts Executive Office of Energy & Environmental Affairs defines nature-based solutions as “…strategies that conserve, create, restore and employ natural resources to enhance climate adaptation, resilience and mitigation to mimic natural processes or work in tandem with man-made engineering approaches to address natural hazards like flooding, erosion, drought, and heat islands and to maintain healthy natural cycles to sequester and maintain carbon and other greenhouse gases” (MA EOEEA, 2019). The overarching goals of the “Northampton Designs with Nature to Reduce Storm Damage” program are to improve stormwater quality, reduce stormwater quantity in problem areas, maximize social and environmental co-benefits, and provide demonstration projects to inspire future longer term and positive impact projects. The City identified ten oppor- tunity sites on public land, which GZA evaluated for the City to identify potential projects that would address the City’s goals. GZA reviewed all of the sites and developed a list of 20 recommended individual projects which had the potential to advance the City’s goals. The potential projects were evaluated by GZA and City of Northampton stakeholders to result in the selection of 11 projects for advancement to conceptual design. This Conceptual Design Summary report describes the conceptual designs which have been prepared by GZA and its subconsultant team. This report is subject to the Limi- tations provided in Appendix A. A common graphical legend for figures presented in this report is included in Appendix B. Conceptual designs for the following implementation projects are described herein: Barrett Street Marsh / King Street Brook Watershed: 1.King Street Brook Flood Control Berm 2.Jackson Street Elementary School Stormwater Retrofits 3.Adare Place Outlet Improvements and Stream Channel Restoration Elm Street Brook Watershed: 4.Smith Vocational and Agricultural High School Bioretention 5.Elm Street Brook Flood Mitigation Historic Mill River Watershed: 6.Old South Street Outfalls 7.Pleasant Street Outfalls Industrial Drive: 8.Industrial Drive Rotary Stormwater Retrofit 9.Industrial Drive Channel Improvements Ice Pond: 10.Ice Pond Outlet Improvements North Farms Road / Broad Brook: 11.North Farms Road/ Broad Brook Culvert Upgrade 24 Note:this page has been excerpted from the "Conceptual Design Summary -Northampton Designs with Nature to Reduce Storm Damage"report,dated March 15,2019,and prepared under an MVP action grant. Northampton Designs with Nature Conceptual Design Summary Page 2 Hereinafter, this report will refer to each proposed implementation as a separate, numbered “Project”. Included for each Project is a general description of the opportunity site and setting, the proposed conceptual design to address the City’s goals, and a summary of Project benefits and challenges. A Locus Map for the eleven projects is presented below. This Conceptual Design Summary report also includes estimates of cost (see Appendix F). The con- ceptual-level opinions of individ- ual Project construction cost presented in this report have been developed prior to any sig- nificant amount of information is available from detailed design and with incomplete work scope definition. In preparing the cost opinions, GZA has developed ap- proximate quantities of work and has utilized a combination of sources of unit cost information which may include published RS Means Cost Data; past bid docu- ments; cost data from federal, state, or local transportation agency web sites; discussions with local experienced contrac- tors; and GZA’s experience with costs for similar projects at simi- lar locations. Because these pre- liminary estimates are made prior to the completion of detailed de- sign, the margin of error is expected to be relatively large; thus, a significant contingency has been applied to cover the occurrence of eventual refinements to the conceptual scope of work and to also mitigate the potential for unplanned events or discoveries during construction. Costs associated with survey; geotechnical investigations; design services; per- mitting; designer services during construction; resident engineer services; unforeseen utility impacts or wetland mitigation requirements; or temporary and permanent easements are not included in the estimates of cost. Notwithstanding these limitations, the opinions of Project cost are provided to inform the City of Northampton about the magnitude of antici- pated construction costs and to furnish information for the City’s use in evaluating the economic feasibility of proceeding with a particular Project and the Project’s potential for further development. The estimates of cost may also be used to help define a preliminary construction budget and may reduce the risk of construction cost escalation during the design development of any Project that advances beyond the conceptual stage. Locus Map 25 Note:this page has been excerpted from the "Conceptual Design Summary -Northampton Designs with Nature to Reduce Storm Damage"report,dated March 15,2019,and prepared under an MVP action grant. Northampton Designs with Nature Conceptual Design Summary Page 36 PROJECT 10 - ICE POND OUTLET IMPROVEMENTS The Ice Pond (Rocky Hill Pond) refers to a former pond lo- cated on the north side of Rocky Hill Road (State Route 66) between the Hampshire County Jail and the Ice Pond Drive residential subdivision. The historical pond receives flow from a 400± acre watershed and has one perennial tribu- tary, known as Rocky Hill Pond Brook. The pond was report- edly constructed to supply ice to the Northampton State Hospital. Under normal, dry-weather conditions, the former pond does not impound water. Rather, flows entering the low area are allowed to exit through a 16-inch pipe that dis- charges into a riser structure that is connected to a 6-ft x 5- ft box culvert beneath Rocky Hill Road. Near the top of the riser structure is a secondary, high-level outlet with a 8-ft x 4-ft vertical rectangular opening (drop inlet). The 16-inch pipe and the high-level outlet are believed to be infrastruc- ture associated with the former pond. During hydrologic events causing significant flows in the brook, the capacity of the 16-inch outlet pipe can be exceeded, and water is temporarily impounded within the footprint of the former pond. If the 16-inch pipe becomes clogged or if inflows are excessive, rising water within the pond may also discharge through the high-level outlet. The former pond essentially acts as a detention basin and mit- igates peak flow rates downstream of Rocky Hill Road. In fact, the Ice Pond Drive subdivision does not have separate deten- tion for its stormwater runoff and instead utilizes the former pond’s flow attenuation capabilities to mitigate potential in- creases in downstream flow rates. Both the 16-inch low-level outlet and the high-level outlet are covered with gratings to prevent large debris from getting into the system and also, presumably, for human safety purposes. Although the grates are maintained monthly, access is difficult and potentially a safety risk when the brook is flowing full or when waters begin to rise within the former pond. Further, high flow events often carry leaves and organic debris from the mostly-wooded watershed, clogging the grates and posing a major flood risk. The Ice Pond overflowed across Rocky Hill Road during a severe storm in April 2007, which dropped approximately 4 inches of rain according to Westfield Barnes Airport precipitation data. This event caused damages to the roadway infrastructure, including washout of the southern (down- stream) roadway shoulder and exposure of underground utilities. This site was selected for conceptual design by City of Northampton stake- holders because of the need for a more resilient outlet structure that will have a lower risk of clogging during storm events when the need for a free- flowing outlet is most critical. KEY OPPORTUNITIES Improve flood resiliency, reduce potential flood- ing and storm damage Enhance natural drainage feature with limited impacts to infrastructure Photo 10-1. Example of Proposed Inlet Structure Figure 10-1. Aerial locus of Ice Pond (Imagery from GoogleEarth) 26 Note:this page has been excerpted from the "Conceptual Design Summary - Northampton Designs with Nature to Reduce Storm Damage"report,dated March 15,2019, and prepared under an MVP action grant. Northampton Designs with Nature Conceptual Design Summary Page 37 PROPOSED CONCEPTUAL DESIGN The objectives of the conceptual design include improvements to both the low-level outlet and drop inlet structure to provide safe access for maintenance, to not unnecessarily impede flows despite some accumulation of leaves or debris during a storm event, and to continue to provide for human health and safety. In addition, the detention capacity of the pond must be maintained, for continued mitigation of peak downstream flow rates. The pro- posed conceptual design in- cludes a retrofit at both the low- level outlet and the drop inlet structure, providing each with an inclined bar grating and including a new accessway to facilitate safe maintenance (Figure 10-2). The retrofit inlet structures will not result in changes to the hy- draulic capacity of the existing outlet structure configuration, and the overall detention capac- ity of the former pond is ex- pected to be maintained. The inclined bar gratings will allow for the accumulation of some de- bris without completely blocking the ability of the structure to pass flow. In addition, the config- uration allows for the ability to remove debris by raking upward from the top of the structure. CONCEPTUAL DESIGN ASSESSMENT Project Benefits This project will improve flood resiliency and reduce the potential for flooding over Rocky Hill Road, as well as the potential for future storm damages such as that which occurred in 2007. The project takes advantage of existing natural drainage features and will not impact NHESP Estimated or Priority Habitat areas. Figure 10-2. Conceptual Design for Ice Pond Outlet Improvements (Imagery © Google) REDUCE FLOODING POTENTIAL 27 Note:this page has been excerpted from the "Conceptual Design Summary - Northampton Designs with Nature to Reduce Storm Damage"report,dated March 15,2019, and prepared under an MVP action grant. Northampton Designs with Nature Conceptual Design Summary Page 38 The retrofit inlet structures will not eliminate the need for maintenance but will allow for safer access to maintain the structures on a regular basis and provide a greater margin of safety against clogging from leaves and other natural debris from the watershed. Potential Challenges There will be wetland impacts associated with construction of the low-level outlet structure retrofit. Direct impacts will likely be less than 500 square feet but will require an Order of Con- ditions from the Northampton Conservation Commission. The work is most likely eligible for Self-Verification under GP 1 of the U.S. Army Corps of Engineers General Permits for Massachu- setts. Some of the work will occur on property owned by the Ice Pond Homeowners Association. It is anticipated that the Ice Pond Homeowners’ Association will be amenable to the Project and allow City access for construction and future maintenance and operation, as the work will improve conditions at the structures that they are responsible for maintaining. Construction Costs The conceptual-level opinion of construction cost for Project 10 – Ice Pond Outlet Improvements is $280,000, as outlined in Appendix F. Refer to page 2 of this Conceptual Design Summary report for a description of the cost estimating meth- odology and limitations. Potential funding sources include FEMA Hazard Mitigation Assistance. PERMITTING CONSTRAINTS PRIVATE PROPERTY 28 Note:this page has been excerpted from the "Conceptual Design Summary - Northampton Designs with Nature to Reduce Storm Damage"report,dated March 15,2019, and prepared under an MVP action grant. ICE POND HOMEOWNERS ASSOCIATION MASSACHUSETTSCOMMONWEALTH OF CITY OFNORTHAMPTON DEPT OFFOOD &AGRICULTURE 210210 215215215 2152 352 1 0 2 3 0 210215 22 5 220 2 2 0 2 1 0 2 1 5 'Rocky Hill Road - Ice Pond 40 0 4020 SC AL E IN FEET Provide New Inlet Structure to Prevent Clogging Retrofit Existing Drop Inlet With Grate Structure Rocky Hill Road10' Proposed Access Drive Proposed Segmental Block Wall 29 Note:this page has been excerpted from the "Conceptual Design Summary - Northampton Designs with Nature to Reduce Storm Damage"report,dated March 15,2019, and prepared under an MVP action grant. EXISTING Wetlands Water System 100' Buffer Hydrants 200' Riverfront Area Water Valves Bank/Intermittent Hydrant Lateral Channel Water Mains Est. Mean Annual High Water Line Abandoned Water Mains Est. Wetland Boundary Water Service Mean Annual High Water Line Wetland Boundary Sewer System Bordering Vegetated Wetland Manholes Land Under Water Abandoned Manholes Sewer Cleanout Stormwater System Sewer Flowmeters Manholes Sewer Stations Culvert Point Sewer Pipes Channel Point Abandoned Sewer Intake Sewer Service Outfall Stations Other Pipe Parcel Lines Channel 5 ft/10 ft Contours Abaondoned Drains 1 ft/2 ft Contours Culvert Detention Basin LEGEND 30 Note:this page has been excerpted from the "Conceptual Design Summary - Northampton Designs with Nature to Reduce Storm Damage"report,dated March 15,2019, and prepared under an MVP action grant. PROPOSED Bioretention Flared End Drain Pipe Drain Manhole Flow Remove CB Remove Tree Remove/Abandon Pipe Structure Treatment Device Limit of Earthwork Impacted Wetlands 1-ft Contours Floodplain Shelf 31 Note:this page has been excerpted from the "Conceptual Design Summary - Northampton Designs with Nature to Reduce Storm Damage"report,dated March 15,2019, and prepared under an MVP action grant. 32 33 Exhibit B-4. Alternatives Two alternatives to the proposed Ice Pond Resiliency Improvements Project were considered. Alternative No. 1 would involve the retrofit of an appropriately-designed debris grating at the low-level outlet, without any new accessways to facilitate inspection, maintenance, and cleaning. While the cost savings would be significant, it was judged to be likely that without improved access the risks would be considerably higher for lack of maintenance and associated reduction in hydraulic capacity through the grating. Essentially, the cost savings would be likely to reduce the potentially greater level of protection afforded by the debris grating; thus, this alternative was not selected. Alternative No. 2 would involve the retrofit of a debris grating at the high-level spillway outlet in addition to the retrofit of an appropriately-designed debris grating at the low-level outlet. When the impounding embankment was overtopped in April 2007, the high-level spillway outlet was covered in 2”-mesh chain link fence fabric. This material was very quickly blinded by accumulating debris and, in addition to the clogged screen at the low-level outlet, was likely a prime contributor to the overtop- ping. Since then, the high-level outlet has been covered by a bar screen that is significantly less prone to clogging by debris (see Photo 8). The expense of retrofitting an inclined bar structure onto the existing high-level spillway outlet does not appear to be justified given that the recently-replaced screen is much less restrictive and will be readily accessible for inspection, maintenance, and cleaning when the new accessways are installed. Essentially, the additional costs and potential for constructability problems likely outweigh any benefits of a potentially greater level of protection; thus, this alternative was not selected. 34 EXHIBIT C. WORK SCHEDULE The table below provides an estimated schedule for key tasks associated with the proposed project: Months from Award Task Start Complete FEMA Award/Project Initiation 0 3 Project Management & Resources 0 2 Appraisals & Easements 1 5 Contractor Procurement 6 9 Construction** 10 25 MEMA Review/Closeout 22 30 The estimated total project period is 30 months. ** A Construction Period of 15 months has been assumed in case the work needs to span a winter shut- down. EXHIBIT D: PROJECT COST ESTIMATE WORKSHEET A detailed cost estimate (2 pages) is attached in this section after this table 35 Name of Sub-Recipient Grant Program City of Northampton HMGP-4372/HMGP-4379 CFDA # Federal Identification Number Budget (Check One) Budget Period Strategic Funds Management 04-6001406 New X___ Revised ___ From:FY19 To: FY22 Yes ______ No ______ FEMA Ob# Task Activity/Cost Classification A. Eligible and Approved Total Cost B. Local Share* C. Federal Share** 1 Project Initiation $ 1,600 $ 40 0 $ 1,200 2 Project Management and Re- sources $ 3,100 $ 775 $ 2,325 3 Appraisals & Easements $ 6,800 $ 1,700 $ 5,100 4 Contractor Procurement $ 3,100 $ 775 $ 2,325 5 Construction $ 332,300 $ 83,075 $ 249,225 6 MEMA Review/Closeout $ 3,100 $ 775 $ 2,325 Subtotal $ 350,000 $ 87,500 $ 262,500 Project (Program ) income Total $ 350,000 $ 87,500 $ 262,500 * Local Share, per regulation, is at most 25% of total eligible and approved costs ** Federal share, per regulation, is at least 75% of total eligible and approved costs Please provide a dollar amount that you anticipate spending in each fiscal year listed below for the federal funds only FY 19 $ 0 FY 20 $ 100,000 FY 21 $ 100,000 FY22 $ 62,500 For Strategic Funds Management, the Federal Funds obligations will be broken down by tasks and duration of the tasks. Mitigation Project Milestone Work Schedule Ob# FEMA Amendment # Duration (Months) Federal Share Amount Date of obligation Contract end DESCRIPTION QUANTITY UNIT UNIT PRICE EXT.TOTAL MOBILIZATION / DEMOBILIZATION / ENG. LAYOUT (10%±)1 LS $34,000 $34,000 $34,000 SITE PREPARATION & SITE DEMOLITION $62,500 CONSTRUCTION ENTRANCE / ACCESS / SECURITY 1 LS $10,000 $10,000 CLEARING AND GRUBBING 0.30 AC $50,000 $15,000 CONTROL & DIVERSION OF WATER 14 DAYS $2,000 $28,000 PERIMETER EROSION CONTROL 500 LF $19 $9,500 EARTHWORK (Associated earthwork is included in cost of site improvements & utility work below)$47,350 STRIP, STACK, SCREEN, & RESPREAD ON-SITE TOPSOIL 300 CY $32 $9,600 EXCESS EXCAVATION - TRUCK OFF SITE - DISPOSAL 100 CY $50 $5,000 GRAVEL BORROW 200 CY $50 $10,000 3/4" CRUSHED STONE 50 CY $63 $3,150 GEOTEXTILE FILTER FABRIC 5,000 SF $0.80 $4,000 ROUGH GRADE SITE 13,000 SF $0.40 $5,200 FINE GRADE SITE 13,000 SF $0.80 $10,400 SITE IMPROVEMENTS $149,563 LARGE-BLOCK WALL ($/SF-WALL FACE)300 SF $70 $21,000 DENSE GRADED CRUSHED STONE ACCESS (INCL. STONE BASE)5,500 SF $7.00 $38,500 4,000 PSI CEMENT CONCRETE, incl. reinf. steel 15 CY $1,800 $27,000 GALVANIZED STEEL TRASH RACKS 3,600 LB $10 $36,000 RIPRAP 20 CY $125 $2,500 BEDDING STONE 5 CY $63 $313 HANDRAIL / GUARD 25 LF $190 $4,750 6-FT CHAIN LINK FENCE 150 LF $80 $12,000 EROSION CONTROL BLANKET 3,000 SF $2.50 $7,500 ENGINEER'S OPINION OF PROBABLE PROJECT IMPLEMENTATION COSTS ICE POND RESILIENCY IMPROVEMENTS PROJECT City of Northampton, Massachusetts for HMGP Sub-Application July 11, 2019 GZA GeoEnvironmental, Inc. GZA's Opinion of Project Implementation Costs is subject to the assumptions and limitations referenced in the Conceptual Design Summary of March 15, 2019 Page 1 36 DESCRIPTION QUANTITY UNIT UNIT PRICE EXT.TOTAL ENGINEER'S OPINION OF PROBABLE PROJECT IMPLEMENTATION COSTS ICE POND RESILIENCY IMPROVEMENTS PROJECT City of Northampton, Massachusetts for HMGP Sub-Application July 11, 2019 LANDSCAPE WORK $5,450 STREAMSIDE LANDSCAPE AND PLANTING ALLOWANCE 300 SF $2.50 $750 GENERAL SEEDING / TURF ESTABLISHMENT 3,000 SF $0.90 $2,700 GENERAL PLANTING ALLOWANCE FOR MISC. TREES AND SHRUBS 1 LS $2,000 $2,000 $298,863 $30,000 $5,000 $333,863 $16,000 $349,863 SAY,$350,000 SUB-TOTAL = GRAND TOTAL (2019 DOLLARS) = ENGINEERING SERVICES FOR BIDDING, CONSTRUCTION, PERMIT COMPLIANCE ( @ 10%± ) = (periodic construction observation, attendance at project meetings, material testing, item and quantity confirmation, submittal and as-built drawing reviews, etc.) CONTINGENCY COST ( @ 5%± ) APPRAISALS AND EASEMENTS COSTS = (temporary and permanent easements, construction access & drainage rights, etc.) SUB-TOTAL = GZA GeoEnvironmental, Inc. GZA's Opinion of Project Implementation Costs is subject to the assumptions and limitations referenced in the Conceptual Design Summary of March 15, 2019 Page 2 37 38 EXHIBIT E: ENVIRONMENTAL COMPLIANCE INFORMATION “Yes” indicates that the environmental regulation or statute may apply to your project. Write the word “yes” or “no” in the Yes/No column. If unknown, write “unknown” in comments section. Please provide relevant infor- mation and/or documentation to support your answers. This list is not all-inclusive. Environmental Regulation or Statute Yes No Comments National Historic Preservation Act (NHPA) 1.A Would the proposed project affect, or is the pro- posed project in close proximity to, any buildings or structures 50 years or more in age? X Portions of the existing outlet struc- ture and box culvert associated with Ice Pond are believed to be greater than 50 years old. 1.B Will the proposed project involve disturbance of ground? If yes, provide approximate SF/LF and approximate depth, and provide past use. X Ground disturbance will be necessary to install the proposed outlet structure and associated with grading of the proposed access road. Approximately 15,000 square feet of existing vege- tated areas will be modified. Much of that disturbance will involve fill, with some limited areas of excavation to a depth of up to 2 ft. 1.C Will the proposed project affect or involve re- moval of any vegetation? X The proposed project will involve re- moval of vegetation such as trees, shrubs, and saplings which are lo- cated in areas required for safe access to the proposed structure. Approxi- mately 20 trees 4” or greater in diameter will be removed. Endangered Species Act (ESA) 2.A Are federally listed or endangered species, or their critical habitat, present in or near the pro- ject area and, if so, which species are present? X While the site is listed as potential Northern long-eared bat habitat using the USFWS IPaC system, a review of the MA NHESP website indicates that the site is not within 0.25 miles of a known hibernacula or 150 radius of a known maternity roost tree. No such locations have been identified within the City of Northampton, per NHESP’s website. 2.B Will the proposed project remove or affect vege- tation? X The proposed project will involve re- moval of vegetation such as trees, shrubs, and saplings which are lo- cated in areas required for safe access to the proposed structure. Approxi- mately 20 trees 4” or greater in diameter will be removed. 2.C Is the proposed project in or near (within 200 feet), or likely to affect, any type of waterbody or body of water? X Yes, the project will involve work within the Rocky Hill Pond Brook and associated non-tidal wetlands. 39 Clean Water Act (CWA) and Rivers and Harbors Act 3.A Will the proposed project involve dredging or disposal of dredged material, excavation, the ad- dition of fill material, or result in any modification to water bodies or wetlands desig- nated as “waters of the United States” as identified by the U.S. Army Corps of Engineers or on the National Wetland Inventory? X The proposed project will involve the limited excavation of pond/wetland areas to install the modified outlet structure. Anticipated volumes of ex- cavation below the ordinary high water are less than 20 cubic yards. Executive Order 11988 (Protection of Floodplains) and Executive Order 11990 (Protection of Wetlands) (note: see additional floodplain/FIRM questions immediately following this chart) 4.A Does a Flood Insurance Rate Map, Flood Hazard Boundary Map, hydrological study, or some other source indicate that the project is located in, or will affect, a 100-year floodplain, a 500- year floodplain (if a critical action), an identified regulatory floodway, or an area prone to flood- ing? X The project area is not mapped as a 100-year or 500-year floodplain in the applicable FIRM. Notwithstand- ing, the project will be located in an area identified by the City of North- ampton’s HMP to be prone to flooding. 4.B Is the proposed project located in, or will it af- fect, a wetland as listed in the National Wetland Inventory? X Ice Pond (aka, Rocky Hill Pond) is included as a Freshwater For- ested/Shrub Wetland classified as PFO1E 4.C Will the proposed project alter a watercourse, waterway, body of water, water flow patterns, or a drainage way, regardless of its floodplain des- ignation? X Slight alteration of Rocky Hill Pond Brook to install new inclined debris rack at the low-level outlet. Environmental Regulation or Statute Yes No Comments 4.D Is the proposed project located in, or will it af- fect, a floodplain or wetland? If yes, the 8-step process summarized in HMA Job Aids must be completed. X The project will impact wetlands and will comply with the Massachusetts Wetlands Protection Act. 4.E Is the Community participating in the NFIP? If “Yes” provide the NFIP Community ID # (FEMA-CID code) and Date X 250167#; 04/03/78 Is there a Flood Insurance Study (FIS) available for your community? X Is the project located in a Special Flood Hazard Area (SFHA)? X Coastal Zone Management Act (CZMA) and Coastal Barrier Resources Act (CBRA) 5.A Is the proposed project located in the State’s des- ignated coastal zone? X 5.B Is the proposed project located in a Coastal Bar- rier Resources System Unit or Otherwise Protected Area? X Farmland Protection Policy Act (FPPA) 6.A Will the proposed project convert more than 5 acres of “prime or unique” farmland outside city limits to a non-agricultural use? X 40 Resource Conservation Recovery Act (RCRA) and Comprehensive Environmental Response, Compensa- tion, and Liability Act 7.A Is there reason to suspect there are contaminants from a current or past use on the property asso- ciated with the proposed project? X 7.B Are there are any studies, investigations, or en- forcement actions related to the property associated with the proposed project? X 7.C Will any project construction or operation activi- ties involve the use of hazardous or toxic materials? X 7.D Are any of the current or past land uses of the property associated with the proposed project or are any of the adjacent properties associated with hazardous or toxic materials? X Executive Order 12898 (Environmental Justice for Low Income and Minority Populations) 8.A Are there any low-income or minority popula- tions in the project’s area of effect or adjacent to the project area? X Areas to the south and east of the pro- ject area contain low income populations based on the Mass GIS “Environmental Justice Viewer”. No permanent/long-term adverse effects are anticipated. There could be tem- porary, short-duration, construction phase impacts in the area during pro- ject construction. Massachusetts Environmental Policy Act (MEPA) 9.A Does your proposed project meet or exceed any Massachusetts Environmental Policy Act (MEPA) thresholds for preparation of an Envi- ronmental Notification Form (ENF), or mandatory Environmental Impact Report (EIR)? X Other Environmental/Historic Preservation Laws (including applicable State laws) or Issues 10.A Are other environmental/historic preservation re- quirements associated with this project? X None known at this time. Environmental Regulation or Statute Yes No Comments 10.B Are any controversial issues associated with this project? X 10.C Have any public meetings been conducted, pub- lic notices been circulated, or public comments been solicited on the proposed project? X A public forum was held during the design phase on October 23, 2018. A design and permitting review meeting was held with the Ice Pond Home- owners’ Association on April 30, 2019. 10.D Is the waterway designated under the National Wild and Scenic Rivers Act? X 10.E Is the project located in (or adjacent to) an Area of Critical Environmental Concern (ACEC)? X Miscellaneous 11.A Please identify the environmental permits antici- pated for project implementation (local Conservation Commission approval, Army Corps of Engineers, Chapter 91, etc.) Wetland Notice of Intent (local con- servation commission and MA DEP), Section 404 (USACE) Self Verifica- tion Notification Form (SVNF). 41 Additional Floodplain/FIRM Information: Based on the FIRM, indicate the flood zone(s) of the project site(s) (e.g., A10, C, AE, V): __C or D___________ 100-Year (base) flood elevation at the site is ____not applicable______ Ft. NGVD 29 (MSL) NAVD 88 X Other (i.e. local) Source of 100-year (base) flood elevation __FIRM____________________________________________ Local Floodplain Administrator consulted? X Yes No Unknown Floodplain Consultation Date: ___7/11/2019__________________________________ Local Floodplain Administrator Name: __Wayne Feiden________________________________ Phone: __(413) 587-1265________________________________ Floodplain Consultation Comments: The Local Floodplain Administrator is supportive of the proposed project. 42 EXHIBIT F. BENEFIT-COST ANALYSIS (BCA) INFORMATION One (1) electronic copy of the BCA is included with this application in this Exhibit (Exhibit F) as well as a printout of the BCA summary. Exhibit F-1: Benefit Cost Narrative/Report Exhibit F-2: Benefit-Cost Ratio .zip and .PDF file Exhibit F-3: Back Up Data Documentation Provided 43 Exhibit F-1: Benefit Cost Narrative/Report Comments: Structure Summary For: Ice Pond Resiliency Improvements, 210 Main Street, Northampton, Massachusetts, 01060, Hampshire Mitigation Hazard BCR Benefits Costs Drainage Improvement Damage-Frequency Assessment 1.38 $507,195 $368,614 $507,195 $368,614Benefits:Costs: Structure Type:Historic Building:Contact:Other No Wayne Feiden 1.38BCR: Project Summary: Point of Contact: Address: 210 Main Street, Northampton, Massachusetts, 01060 Wayne Feiden Project Number:Disaster #: Program: Analyst: 15.0166700.00 4372-MA & 4379-MA HMGP City of Northampton, MA Tom Jenkins 413-587-1265Phone Number: Email:wfeiden@northamptonma.gov Agency: 0.070Discount Rate: Version:5.3.0 12 Jul 2019 Project:Pg 1 of 7 Total Benefits:Total Costs:BCR: Project Number:Disaster #:Program:Agency: State:Point of Contact:Analyst: 15.0166700. 00 4372-MA & 4379-MA HMGP City of Northampton, MA Massachus etts Ice Pond Resiliency Improvements $507,195 $368,614 1.38 Tom JenkinsWayne Feiden 44 Structure and Mitigation Details For: Benefits:Costs:BCR: Ice Pond Resiliency Improvements, 210 Main Street, Northampton, Massachusetts, 01060, Hampshire $507,195 $368,614 1.38 Project Useful Life: 30Latitude:Longitude: Hazard:Damage-Frequency Assessment - Flood Mitigation Option: Drainage Improvement Mitigation Information Basis of Damages: Number of Damage Events: Expected Damages 3 3Number of Events with Know Recurrence Intervals: Version: 5.3.0 12 Jul 2019 Project:Pg 2 of 7 Total Benefits:Total Costs:BCR: Project Number:Disaster #:Program:Agency: State:Point of Contact:Analyst: 15.0166700. 00 4372-MA & 4379-MA HMGP City of Northampton, MA Massachus etts Ice Pond Resiliency Improvements $507,195 $368,614 1.38 Tom JenkinsWayne Feiden 45 Damages After MitigationDamages Before Mitigation Expected Damages Before and After Mitigation Analysis Year: Year Built: Analysis Duration: User Input Analysis Duration: Utilities ($/day): Buildings ($/day): Roads/Bridges ($/day): 2019 $24,993.33 Damage Year: RI: 10.00 Are Damages In Current Dollars? Yes Buildings (Days): Utilities (Days): Roads (Days): 3.0 Assumed Damages ($)$160,000 Total $234,980 Total Inflated Volunteers Cost Number of Volunteers Required: Cost of Volunteers Time ($/Hour/Person): Per-Person Cost of Lodging for a Volunteer: Number of Hours Volunteered/Person: Number of Days Lodging/Volunteer: Cost of Volunteers: Facility Description: Roads And Bridges Rocky Hill Road (State Route 66) 0:8 5,000 1.0 0.540 $24,993 Estimated Number of One-Way Traffic Trips Per Day: Economic Loss Per Day of Loss of Function: Federal Rate: Number of Additional Miles: Additional Time per One-Way Trip: Version: 5.3.0 12 Jul 2019 Project:Pg 3 of 7 Total Benefits:Total Costs:BCR: Project Number:Disaster #:Program:Agency: State:Point of Contact:Analyst: 15.0166700. 00 4372-MA & 4379-MA HMGP City of Northampton, MA Massachus etts Ice Pond Resiliency Improvements $507,195 $368,614 1.38 Tom JenkinsWayne Feiden 46 Damage Year: RI: 25.00 Are Damages In Current Dollars? Yes Buildings (Days): Utilities (Days): Roads (Days): 6.0 Assumed Damages ($)$360,000 Total $509,960 Total Inflated Volunteers Cost Number of Volunteers Required: Cost of Volunteers Time ($/Hour/Person): Per-Person Cost of Lodging for a Volunteer: Number of Hours Volunteered/Person: Number of Days Lodging/Volunteer: Cost of Volunteers: Damage Year: RI: 100.00 Are Damages In Current Dollars? Yes Buildings (Days): Utilities (Days): Roads (Days): 8.0 Assumed Damages ($)$430,000 Total $629,947 Total Inflated Volunteers Cost Number of Volunteers Required: Cost of Volunteers Time ($/Hour/Person): Per-Person Cost of Lodging for a Volunteer: Number of Hours Volunteered/Person: Number of Days Lodging/Volunteer: Cost of Volunteers: RI: 10.00 Are Damages In Current Dollars? Yes Buildings (Days): Utilities (Days): Roads (Days): 0.0 Assumed Damages ($)$0 Total $0 RI: 25.00 Are Damages In Current Dollars? Yes Buildings (Days): Utilities (Days): Roads (Days): 0.0 Assumed Damages ($)$0 Total $0 RI: 100.00 Are Damages In Current Dollars? Yes Buildings (Days): Utilities (Days): Roads (Days): 4.0 Assumed Damages ($)$220,000 Total $319,973 Social Benefits Mental Stress and Anxiety Lost Productivity Version: 5.3.0 12 Jul 2019 Project:Pg 4 of 7 Total Benefits:Total Costs:BCR: Project Number:Disaster #:Program:Agency: State:Point of Contact:Analyst: 15.0166700. 00 4372-MA & 4379-MA HMGP City of Northampton, MA Massachus etts Ice Pond Resiliency Improvements $507,195 $368,614 1.38 Tom JenkinsWayne Feiden 47 Cost Estimate Project Useful Life (years): Detailed Scope of Work: Detailed Estimate for Entire Project: Mitigation Project Cost: Annual Project Maintenance Cost: Final Mitigation Project Cost: 30 Yes Yes$350,000 $368,614 $1,500 30 $18,614 Yes Years of Maintenance: Present Worth of Annual Maintenance Costs: Estimate Reflects Current Prices: Cost Basis Year: Construction Start Year: Construction End Year:Project Escalation: Construction Type: BCR Calculation Results Expected Annual Damages Before Mitigation Expected Annual Damages After Mitigation Expected Avoided Damages After Mitigation (Benefits) Annual: Present Value: $546,904 $44,073 Annual: Present Value: $3,200 $39,709 Annual: Present Value: $40,873 $507,195 Mitigation Benefits:$507,195 Mitigation Costs:$368,614 Benefits Minus Costs:Benefit-Cost Ratio:$138,581 1.38 $0.00 0 $0.00 0 $8,736.00$2,443.00 Number of Person:Number of Worker: Treatment Costs per person:Productivity Loss per person: Total Mental Stress and Anxiety Cost:Total Lost Productivity Cost: Environmental Benefits Land Use Total Project Area (Acres):0.00000000 Parcel Type % of Parcel Type Being Used $/Acre/Year 0%$0 Version: 5.3.0 12 Jul 2019 Project:Pg 5 of 7 Total Benefits:Total Costs:BCR: Project Number:Disaster #:Program:Agency: State:Point of Contact:Analyst: 15.0166700. 00 4372-MA & 4379-MA HMGP City of Northampton, MA Massachus etts Ice Pond Resiliency Improvements $507,195 $368,614 1.38 Tom JenkinsWayne Feiden 48 Justification/Attachments Version: 5.3.0 12 Jul 2019 Project:Pg 6 of 7 Total Benefits:Total Costs:BCR: Project Number:Disaster #:Program:Agency: State:Point of Contact:Analyst: 15.0166700. 00 4372-MA & 4379-MA HMGP City of Northampton, MA Massachus etts Ice Pond Resiliency Improvements $507,195 $368,614 1.38 Tom JenkinsWayne Feiden 49 Field Description Attachments Additional Time per One-Way Trip Calculated based on average transit speed, accounting for multiple intersections along detour route. Detour Routing.pdf Analysis Year See attached "Documentation of Expected Damages Scenarios and Anticipated Benefits of the Project", GZA, July 11, 2019. 2019 07 11 Damages-Benefits Scenario.pdf Annual Project Maintenance Cost From the HMGP Application: "The annual maintenance costs associated with this [post-mitigation] maintenance schedule are estimated to be $1,500/year." Estimated Number of One-Way Traffic Trips Per Day MassDOT records from 2013-2018 provided in upload. MassDOT Traffic Counts.pdf Expected damages before mitigation See attached "Documentation of Expected Damages Scenarios and Anticipated Benefits of the Project", GZA, July 11, 2019. 2019 07 11 Damages-Benefits Scenario.pdf Mitigation Project Cost See attached "ENGINEER'S OPINION OF PROBABLE PROJECT IMPLEMENTATION COSTS", GZA, July 11, 2019 2019 07 11 ICE POND COST ESTIMATE FOR HMGP.pdf Number of Additional Miles See uploaded document showing normal routing and assumed detour routing. Detour Routing.pdf Number of years of maintainance same as Useful Life Project useful life BCA Reference Guide, June 2009 APPENDIX D - Project Useful Life Summary Culverts (concrete, PVC, CMP, HDPE, etc.) - Standard Value Project Useful Life.pdf Unknown Frequency - Damages after Mitigation See attached "Documentation of Expected Damages Scenarios and Anticipated Benefits of the Project", GZA, July 11, 2019. 2019 07 11 Damages-Benefits Scenario.pdf Version: 5.3.0 12 Jul 2019 Project:Pg 7 of 7 Total Benefits:Total Costs:BCR: Project Number:Disaster #:Program:Agency: State:Point of Contact:Analyst: 15.0166700. 00 4372-MA & 4379-MA HMGP City of Northampton, MA Massachus etts Ice Pond Resiliency Improvements $507,195 $368,614 1.38 Tom JenkinsWayne Feiden 50 51 Exhibit F-2: Benefit-Cost Ratio .zip and .PDF file (TRANSMITTED ELECTRONICALLY WITH APPLICATION) 52 Exhibit F-3: Back Up Data Documentation Provided (15 pages) Ice Po nd Resi liency Improvemen ts Detour Des c riptions Legend Detour ICE POND O UTLET No Detour 2000 ft N➤➤N53 2.5 miles 1.5 miles Detour Delay Calculations: Detour: 2.5 miles @ 15 mph =10 min. Existing: 1.5 miles @ 45 mph =2 min. DELAY:8 min. GZA 07/11/19 53 Additional Information in Support of MEMA-DCR Grant Application for Hazard Mitigation Grant Program (HMGP) (HMGP-4372-MA; HMGP-4379-MA) Ice Pond Resiliency Improvements Northampton, Massachusetts Documentation of Expected Damages Scenarios and Anticipated Benefits of the Project Prepared for City of Northampton, Massachusetts Department of Planning & Sustainability 210 Main Street Northampton, MA 01060 Prepared by GZA GeoEnvironmental, Inc. One Financial Plaza 1350 Main Street, Suite 1400 Springfield, MA 01103 413-726-2100 July 11, 2019 54 55 Background The Ice Pond (aka. Rocky Hill Pond) refers to a former pond located on the north side of Rocky Hill Road (State Route 66), between the Hampshire County Jail and the Ice Pond Drive residential subdivision in Northampton, Massachusetts. The historical pond receives flow from a 400± acre watershed and has one perennial tributary, known as Rocky Hill Pond Brook. The pond was con- structed in the early 1890s to supply ice for the Norwood Ice Company. The pond was abandoned as an ice source in the early 1930s, although the original impounding embankment and the spillway infrastructure remains in place. Currently, under normal dry-weather conditions, the former pond does not impound water. Rather, flows from Rocky Hill Pond Brook and other sources of runoff entering the pond basin are allowed to exit and pass through the embankment via a 16-inch diam- eter pipe that discharges into a riser structure that is connected to a 6-ft x 5-ft box culvert beneath Rocky Hill Road. At the top of the riser structure is a secondary, high -level spillway outlet, with a 8-ft x 4-ft vertical rectangular opening (drop inlet). The box culvert beneath Rocky Hill Road was constructed by the City of Northampton in 1924, following a spring freshet that caused the former dam to overtop. As reported in The Springfield Republican on April 24, 1924: “Rocky Hill brook brought so much pressure against the dam of Rocky Hill pond that the dam was broken down, and the tumbling waters washed out a broad gulch in the neighboring roadway of the Northampton Easthampton highway.” The 16-inch pipe and the high-level spillway outlet are believed to be infrastructure associated with the former functioning ice pond. During hydrologic events causing significant flows in Rocky Hill Pond Brook, the 16-inch outlet pipe acts as a throttling device, and water is temporarily im- pounded within the footprint of the former pond. This throttling effect protects downstream areas from flooding, scouring flows, and high volumes of runoff. If the 16-inch pipe becomes clogged or if inflows are excessive, rising water within the pond may also discharge through the former high-level spillway outlet. Thus, the former pond essentially acts as a detention basin and mitigates peak flow rates downstream of Rocky Hill Road. Both the 16-inch low-level outlet and the high- level spillway outlet are covered with simple clog-prone gratings to prevent large debris from get- ting into the system and also, presumably, for human safety purposes. The grates are typically observed on at least a monthly basis. Access for inspection and maintenance is difficult and rep- resents a safety risk, especially when the brook is flowing full or when waters begin to rise within the former pond. Further, high flow events typically carry leaves and organic debris from the mostly-wooded watershed, clogging the grates and posing a major flood risk. The Ice Pond overflowed across Rocky Hill Road during a significant storm in April 2007, which dropped approximately 4 inches of rain according to Westfield Barnes Airport precipitation data. This event caused damages to the roadway infrastructure, including a washout of the southern (downstream) roadway shoulder and exposure of underground utilities (see photograph on the cover of this HMGP Sub-Application). Fortunately, the raging waters receded prior to more ex- tensive damage to the exposed utilities. Clogging of the low-level outlet within the Ice Pond basin is believed to be a prime contributor to the embankment overtopping and roadway washout events in April 2007. Hydraulic analyses 56 conducted by GZA in 2019 indicate that a properly-designed debris rack could preserve the hy- draulic capacity of the low-level outlet and minimize the risk of embankment overtopping and maintain the downstream flooding risk reductions provided by the Ice Pond. Without the Ice Pond Resiliency Improvements in place, the risk of recurring debris interference and resultant embank- ment overtopping remains high. Based on rainfall records at the Barnes Airport in nearby Westfield, MA, the hydrologic event that resulted in the April 2007 embankment overtopping pro- vided rainfall in a total amount of 4.09 inches over a 26 hour period. According to NOAA’s Atlas 14, rainfalls of this intensity have about a 20 percent chance of occurring in any given year (i.e., the “5-year storm”). Hydrologic and hydraulic analyses conducted by GZA in 2019 indicate that in the absence of appreciable clogging of the low-level outlet at Ice Pond, overtopping of the em- bankment would not be anticipated for storms less than a 25-year return period. It is believed that significant brook flow events in conjunction with debris clogging of the low- level outlet will continue to pose an elevated risk for embankment overtopping, erosion and un- dermining of Rocky Hill Road (State Route 66), and potential disruption of utilities in the road. Such occurrences would inconvenience the public, interfere with emergency response, represent a threat to human health and safety, result in damages to the natural environment and wildlife habitat, demand emergency response services at times when they are needed at other locations in the city, and require expensive emergency repairs to the infrastructure. This engineering evaluation has been prepared to evaluate potential damages that could be ex- pected during significant flooding events associated with clogging of the Ice Pond low-level outlet resulting in embankment overtopping as occurred in 2007 or worse. The potential damages are recognized as “benefits” in the Benefit Cost Analysis in support of the HMGP application. Setting At the Site location, Rocky Hill Pond Brook has a total drainage area of approximately 400 acres (0.63± square miles). The watershed predominately includes rural residential development and wooded areas. The 6-ft x 5-ft box culvert beneath Rocky Hill Road was constructed by the City of Northampton in 1924, following a spring freshet that caused the former Ice Pond dam to overtop and wash away the road. As reported in The Springfield Republican on April 24, 1924: “Rocky Hill brook brought so much pressure against the dam of Rocky Hill pond that the dam was broken down, and the tumbling waters washed out a broad gulch in the neighboring roadway of the Northampton Easthampton highway.” Assumed Failure Mechanism It is anticipated that the most significant flood-related damages and losses at the Site would be caused by overtopping of the Ice Pond embankment resulting from a clogged debris screen at the low-level outlet within the Ice Pond basin. Based on an understanding of the documented overtopping event in 2007, field observations, and review of topographic information, it can be envisioned that overtopping and resulting damages 57 could occur during even frequently-expected storm events should the low-level outlet be clogged with debris. While the current debris screen is regularly inspected and maintained, it is difficult if not impossible to access during large storm events. The hydrologic event in April 2007 which resulted in embankment overtopping and significant damages to downstream areas was equivalent to a 5-year storm event. This damages scenario assumes that significant clogging could occur in up to 50% of such hydrologic events. A simple analysis would be that the annual chance of a 5- year storm or great occurring coincidentally with clogging of the unimproved debris screen is ½ the otherwise statistical chance. In other words, this damages scenario assumes that the annual chance of embankment overtopping resulting from clogging of the low-level outlet is at least 10% (i.e., a 10-year return period). Assumed Damages Damage scenarios were developed for two events based on an anticipated 10-percent annual chance of embankment overtopping resulting from storm events such as what occurred in April 2007 (4.09 inches over a 26 hour period) and a somewhat arbitrary assignment of larger damages associated with embankment overtopping during less frequent coincidences of storm intensity and low-level outlet clogging, designated as the 4-percent annual chance (“25-year”) event. Addition- ally, the 1-percent annual chance (“100-year event”) is included, with pre-mitigation damages being very similar to post-mitigation damages, and the embankment is anticipated to overtop dur- ing a 100-year storm event, regardless of the condition of the low-level outlet. Nonetheless, the post-mitigation damages are assumed to be only half of the pre-mitigation damages during this 1- percent annual chance event. Environmental Cleanup • Sediment removal and cleanup—the magnitude of damages would likely result in sedi- ment deposition that would be environmentally or hydraulically objectionable in downstream areas; in units of cubic yards, based on an assumed erosion volume. Repairs • Police, detour establishment, and traffic control—damages to the roadway were assumed to result in full or partial closure of Rocky Hill Road (State Route 66), requiring police detail for traffic control, detour establishment, signage, and maintenance; in units of hours, based on an estimate of how long the road closure/detour might be in effect. • Road repair—emergency repair (in kind) of the damaged section of roadway, including drainage facilities; in units of linear feet. Detours • Costs associated with the implemented detours is included in the BCA module. Unit prices were based on engineer’s recent experience with similar types of work in the vicinity. Narrative Descriptions of Assumed Damages – Pre-Mitigation: 10-Year Damages 58 The assumption is approximately 100 linear feet of roadway damages. Two-person around-the-clock police detail is assumed, along with a total detour/traffic control effort of 3 days. Total cost of damages: $160,000. 25-Year Damages The assumption is approximately 200 linear feet of roadway damages. Two-person around- the-clock police detail is assumed, along with a total detour/traffic control effort of 6 days. Total cost of damages: $360,000. 100-Year Damages The assumption is approximately 250 linear feet of roadway damages. Two-person around- the-clock police detail is assumed, along with a total detour/traffic control effort of 8 days. Total cost of damages: $430,000. Narrative Descriptions of Assumed Damages – Post-Mitigation: 10-Year Damages It is assumed that there will be no overtopping and thus no damages related to flooding. Total cost of damages: $0. 25-Year Damages It is assumed that there will be no overtopping and thus no damages related to flooding. Total cost of damages: $0. 100-Year Damages The assumption is approximately 125 linear feet of roadway damages. Two-person around- the-clock police detail is assumed, along with a total detour/traffic control effort of 4 days. Total cost of damages: $220,000. Calculated damages are tabulated on the attached summary of damage / frequency estimates. 59 References BCA Helpline. http://www.bchelpline.com/. Accessed January 2, 2019. Federal Emergency Management Agency (FEMA), Flood Insurance Study, Northampton, Mas- sachusetts, April 3, 1978. Federal Emergency Management Agency (FEMA), BCA Reference Guide, June 2009. Federal Emergency Management Agency (FEMA), Hazard mitigation Assistance Guidance, Feb- ruary 27, 2015. 60 DESCRIPTION QUANTITY UNIT UNIT PRICE EXTENSION SUBTASK TOTAL SAY: ENVIRONMENTAL CLEANUP:$53,000 $50,000 SEDIMENT AND EROSION CONTROL 200 LF $15.00 $3,000 SEDIMENT REMOVAL AND CLEANUP 500 CY $100.00 $50,000 REPAIRS:$111,640 $110,000 POLICE, DETOURS, TRAFFIC CONTROL (2 police staff around-the-clock, erection and maintenance of road closure and detours, and ancillary traffic control)72 HOURS $120.00 $8,640 EMBANKMENT REPAIR (furnish & install compacted gravel borrow to replace that lost to erosion above)600 CY $80.00 $48,000 ROAD REPAIR (Bit.conc. paving, striping, guardrail, granite curb, bit.conc. berm, loam & seed)100 LF $550.00 $55,000 TOTAL:$160,000 ENVIRONMENTAL CLEANUP:$123,000 $120,000 SEDIMENT AND EROSION CONTROL 200 LF $15.00 $3,000 SEDIMENT REMOVAL AND CLEANUP 1,200 CY $100.00 $120,000 REPAIRS:$242,480 $240,000 POLICE, DETOURS, TRAFFIC CONTROL (2 police staff around-the-clock, erection and maintenance of road closure and detours, and ancillary traffic control)144 HOURS $120.00 $17,280 EMBANKMENT REPAIR (furnish & install compacted gravel borrow to replace that lost to erosion above)1,440 CY $80.00 $115,200 ROAD REPAIR (Bit.conc. paving, striping, guardrail, granite curb, bit.conc. berm, loam & seed)200 LF $550.00 $110,000 TOTAL:$360,000 ENVIRONMENTAL CLEANUP:$143,000 $140,000 SEDIMENT AND EROSION CONTROL 200 LF $15.00 $3,000 SEDIMENT REMOVAL AND CLEANUP 1,400 CY $100.00 $140,000 REPAIRS:$294,940 $290,000 POLICE, DETOURS, TRAFFIC CONTROL (2 police staff around-the-clock, erection and maintenance of road closure and detours, and ancillary traffic control)192 HOURS $120.00 $23,040 EMBANKMENT REPAIR (furnish & install compacted gravel borrow to replace that lost to erosion above)1,680 CY $80.00 $134,400 ROAD REPAIR (Bit.conc. paving, striping, guardrail, granite curb, bit.conc. berm, loam & seed)250 LF $550.00 $137,500 TOTAL:$430,000 100-YEAR DAMAGES 10-YEAR DAMAGES ICE POND RESILIENCY IMPROVEMENTS PROJECT Northampton, MA HMGP -4372-MA; HMGP-4379-MA PRE-Mitigation Damages ESTIMATES INCLUDE ALL MOBILIZATION, ENGINEERING & LAYOUT, SEDIMENT & EROSION CONTROL, SITE PREPARATION & DEMOLITION, EARTHWORK, CURBING, ROADWAY AND SIDEWALK PAVEMENTS, PAVEMENT MARKINGS & SIGNAGE, GUARDRAIL, AND SEEDING. Damages are assumed to result from embankment overtopping at the Ice Pond and associated damages to the existing Rocky Hill Road (State Route 66), local drainage structures and piping, and cleanup of environmentally-related impacts including the release and downstream deposition of significant quantities of sediment from erosion of the roadway embankments. 25-YEAR DAMAGES DAMAGE / FREQUENCY ESTIMATES PAGE 1 OF 2 GZA 15.0166717.00 61 DESCRIPTION QUANTITY UNIT UNIT PRICE EXTENSION SUBTASK TOTAL SAY: ENVIRONMENTAL CLEANUP:$0 $0 SEDIMENT AND EROSION CONTROL 0 LF $15.00 $0 SEDIMENT REMOVAL AND CLEANUP 0 CY $100.00 $0 REPAIRS:$0 $0 POLICE, DETOURS, TRAFFIC CONTROL (2 police staff around-the-clock, erection and maintenance of road closure and detours, and ancillary traffic control)0 HOURS $120.00 $0 EMBANKMENT REPAIR (furnish & install compacted gravel borrow to replace that lost to erosion above)0 CY $80.00 $0 ROAD REPAIR (Bit.conc. paving, striping, guardrail, granite curb, bit.conc. berm, loam & seed)0 LF $550.00 $0 TOTAL:$0 ENVIRONMENTAL CLEANUP:$0 $0 SEDIMENT AND EROSION CONTROL 0 LF $15.00 $0 SEDIMENT REMOVAL AND CLEANUP 0 CY $100.00 $0 REPAIRS:$0 $0 POLICE, DETOURS, TRAFFIC CONTROL (2 police staff around-the-clock, erection and maintenance of road closure and detours, and ancillary traffic control)0 HOURS $120.00 $0 EMBANKMENT REPAIR (furnish & install compacted gravel borrow to replace that lost to erosion above)0 CY $80.00 $0 ROAD REPAIR (Bit.conc. paving, striping, guardrail, granite curb, bit.conc. berm, loam & seed)0 LF $550.00 $0 TOTAL:$0 ENVIRONMENTAL CLEANUP:$73,000 $70,000 SEDIMENT AND EROSION CONTROL 200 LF $15.00 $3,000 SEDIMENT REMOVAL AND CLEANUP 700 CY $100.00 $70,000 REPAIRS:$147,470 $150,000 POLICE, DETOURS, TRAFFIC CONTROL (2 police staff around-the-clock, erection and maintenance of road closure and detours, and ancillary traffic control)96 HOURS $120.00 $11,520 EMBANKMENT REPAIR (furnish & install compacted gravel borrow to replace that lost to erosion above)840 CY $80.00 $67,200 ROAD REPAIR (Bit.conc. paving, striping, guardrail, granite curb, bit.conc. berm, loam & seed)125 LF $550.00 $68,750 TOTAL:$220,000 10-YEAR DAMAGES 25-YEAR DAMAGES 100-YEAR DAMAGES ICE POND RESILIENCY IMPROVEMENTS PROJECT Northampton, MA HMGP -4372-MA; HMGP-4379-MA DAMAGE / FREQUENCY ESTIMATES POST-Mitigation Damages ESTIMATES INCLUDE ALL MOBILIZATION, ENGINEERING & LAYOUT, SEDIMENT & EROSION CONTROL, SITE PREPARATION & DEMOLITION, EARTHWORK, CURBING, ROADWAY AND SIDEWALK PAVEMENTS, PAVEMENT MARKINGS & SIGNAGE, GUARDRAIL, AND SEEDING. Damages are assumed to result from embankment overtopping at the Ice Pond and associated damages to the existing Rocky Hill Road (State Route 66), local drainage structures and piping, and cleanup of environmentally-related impacts including the release and downstream deposition of significant quantities of sediment from erosion of the roadway embankments. PAGE 2 OF 2 GZA 15.0166700.00 62 TCDS Locations Short Continuous WIM Located Short Located Continuous Located WIM 7/11/2019 0 1500 3000 Feet Page 1 of 2Print Map 7/11/2019https://mhd.ms2soft.com/tms/map/PrintMap.aspx?sid=r0l3kjhmgqotim2odtbkg... ICE POND SITE 63 Page 2 of 2Print Map 7/11/2019https://mhd.ms2soft.com/tms/map/PrintMap.aspx?sid=r0l3kjhmgqotim2odtbkg... 64 THIS PAGE INTENTIONALLY LEFT BLANK DESCRIPTION QUANTITY UNIT UNIT PRICE EXT.TOTAL MOBILIZATION / DEMOBILIZATION / ENG. LAYOUT (10%±)1 LS $34,000 $34,000 $34,000 SITE PREPARATION & SITE DEMOLITION $62,500 CONSTRUCTION ENTRANCE / ACCESS / SECURITY 1 LS $10,000 $10,000 CLEARING AND GRUBBING 0.30 AC $50,000 $15,000 CONTROL & DIVERSION OF WATER 14 DAYS $2,000 $28,000 PERIMETER EROSION CONTROL 500 LF $19 $9,500 EARTHWORK (Associated earthwork is included in cost of site improvements & utility work below)$47,350 STRIP, STACK, SCREEN, & RESPREAD ON-SITE TOPSOIL 300 CY $32 $9,600 EXCESS EXCAVATION - TRUCK OFF SITE - DISPOSAL 100 CY $50 $5,000 GRAVEL BORROW 200 CY $50 $10,000 3/4" CRUSHED STONE 50 CY $63 $3,150 GEOTEXTILE FILTER FABRIC 5,000 SF $0.80 $4,000 ROUGH GRADE SITE 13,000 SF $0.40 $5,200 FINE GRADE SITE 13,000 SF $0.80 $10,400 SITE IMPROVEMENTS $149,563 LARGE-BLOCK WALL ($/SF-WALL FACE)300 SF $70 $21,000 DENSE GRADED CRUSHED STONE ACCESS (INCL. STONE BASE)5,500 SF $7.00 $38,500 4,000 PSI CEMENT CONCRETE, incl. reinf. steel 15 CY $1,800 $27,000 GALVANIZED STEEL TRASH RACKS 3,600 LB $10 $36,000 RIPRAP 20 CY $125 $2,500 BEDDING STONE 5 CY $63 $313 HANDRAIL / GUARD 25 LF $190 $4,750 6-FT CHAIN LINK FENCE 150 LF $80 $12,000 EROSION CONTROL BLANKET 3,000 SF $2.50 $7,500 ENGINEER'S OPINION OF PROBABLE PROJECT IMPLEMENTATION COSTS ICE POND RESILIENCY IMPROVEMENTS PROJECT City of Northampton, Massachusetts for HMGP Sub-Application July 11, 2019 GZA GeoEnvironmental, Inc. GZA's Opinion of Project Implementation Costs is subject to the assumptions and limitations referenced in the Conceptual Design Summary of March 15, 2019 Page 1 65 DESCRIPTION QUANTITY UNIT UNIT PRICE EXT.TOTAL ENGINEER'S OPINION OF PROBABLE PROJECT IMPLEMENTATION COSTS ICE POND RESILIENCY IMPROVEMENTS PROJECT City of Northampton, Massachusetts for HMGP Sub-Application July 11, 2019 LANDSCAPE WORK $5,450 STREAMSIDE LANDSCAPE AND PLANTING ALLOWANCE 300 SF $2.50 $750 GENERAL SEEDING / TURF ESTABLISHMENT 3,000 SF $0.90 $2,700 GENERAL PLANTING ALLOWANCE FOR MISC. TREES AND SHRUBS 1 LS $2,000 $2,000 $298,863 $30,000 $5,000 $333,863 $16,000 $349,863 SAY,$350,000 SUB-TOTAL = GRAND TOTAL (2019 DOLLARS) = ENGINEERING SERVICES FOR BIDDING, CONSTRUCTION, PERMIT COMPLIANCE ( @ 10%± ) = (periodic construction observation, attendance at project meetings, material testing, item and quantity confirmation, submittal and as-built drawing reviews, etc.) CONTINGENCY COST ( @ 5%± ) APPRAISALS AND EASEMENTS COSTS = (temporary and permanent easements, construction access & drainage rights, etc.) SUB-TOTAL = GZA GeoEnvironmental, Inc. GZA's Opinion of Project Implementation Costs is subject to the assumptions and limitations referenced in the Conceptual Design Summary of March 15, 2019 Page 2 66 APPENDIX D Project Useful Life Summary \7-NOV-11\\ D-1 Project Type Useful L ife (years) Comment Standard Value Acceptable Limits (documentation required) Acquisition/Relocation All Structures 100 100 Elevation Residential Building 30 30–50 Non -Residential Building 25 25–50 Public Building 50 50–100 Historic Building s 50 50–100 Structural/Non-Structural Building Project Residential Building Retrofit 30 30 Non -Residential Building Retrofit 25 25–50 Public Building Retrofit 50 50–100 Historic Building Retrofit 50 50–100 Roof Diaphragm Retrofit 30 30 Roof hardening and roof clips Tornado Safe Room – Residential 30 30 Tornado Safe Room – Community 30 30–50 Retrofit or small community safe room ≤ 16 people (30 yr), New (50 yr) Non -Structural Building Elements 30 30 Ceilings, electrical cabinets, generators, parapet walls, or chimneys Non -Structural Major Equipment 15 15–30 Elevators, HVAC, sprinklers Non -Structural Minor Equipment 5 5–20 Generic contents, racks, shelves Infrastructure Projects Major Infrastructure (minor localized flood reduction projects ) 50 35–100 Concrete Infrastructure, Flood Walls, Roads, Bridges, Major Drainage System 50 35–50 Culverts (concrete, PVC, CMP, HDPE, etc.) 30 25–50 Culvert with end treatment (i.e., wing walls, end sections, head walls, etc.) 10 5–20 Culvert without end treatment (i.e., wing walls, end sections, head walls, etc.) Pump Stations, Substations, Wastewater Systems, or Equipment Such as Generators 50 50 Structures 5 5–30 Equipment Hurricane Storm Shutters 15 15–30 Depends on type of storm shutter Utility Mitigation Projects 50 50–100 Major (power lines, cable, hardening gas, water, sewer lines, etc.) 5 5–30 Minor (backflow values, downspout disconnect, etc.) 67 68 EXHIBIT G. ELEVATION AND ACQUISTION DOCUMENTATION PACKAGE This exhibit is only required for Property Acquisition and Relocation projects. Not applicable to this project. 69 70 71 72 EXHIBIT N. FEMA ASSURANCES PACKAGE Included herein are the three requested forms: FEMA Assurances Form for Construction Projects Contractor Authorized Signatory Listing (CASL) Form MEMA Subrecipient Pre-Award Risk Assessment Questionnaire (SPARQ) Form 73 74 75 76 77 78 79 80 81 EXHIBIT O. MISCELLANEOUS ATTACHMENTS The following are included in this Exhibit, as referenced elsewhere in this application: NOT APPLICABLE