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Stormwater Management Report 040219 Stormwater Management Report ___________________________________________________________________________ for Rocky Hill Bike Trail Burts Bog Conservation Area Northampton, MA April 2, 2019 Prepared by: 4 Allen Place, Northampton, Massachusetts 01060 Rocky Hill Bike Trail – Burts Bog Conservation Area April 2, 2019 Northampton, Massachusetts Stormwater Management Report The Berkshire Design Group, Inc. Page i Table of Contents I. Introduction ........................................................................................................................1 II. Existing Conditions ..............................................................................................................1 III. Proposed Conditions ...........................................................................................................2 IV. Calculations and Design .......................................................................................................2 V. MADEP Stormwater Standards Compliance..........................................................................6 Figures Figure 1 Project Location Figures 2 & 3 Existing Conditions Figure 4 Proposed Conditions Figure 5 -10 Proposed Trail Hydrology and Crossings Appendix Appendix A NRCS Soil Report Appendix B Stormwater Hydrology Calculations Appendix C Groundwater Recharge Calculations Appendix D Water Quality Calculations Appendix E Runoff Conveyance Appendix F Stormwater Management System – Operation & Maintenance Plan Appendix G Illicit Discharge Statement Appendix H Massachusetts DEP Stormwater Checklist Referenced Documents Plan Set Rocky Hill Bike Trail Permit Set Rocky Hill Bike Trail – Burts Bog Conservation Area April 2, 2019 Northampton, Massachusetts Stormwater Management Report The Berkshire Design Group, Inc. Page 1 The City of Northampton is proposing the construction of a multi-use trail through the Burts Bog Conservation Area linking Burts Pit Road, Overlook Drive, and Sandy Hill Road. The Berkshire Design Group has prepared a Stormwater Management and Erosion and Sedimentation Control Plan for the site, in compliance with the Massachusetts Stormwater Handbook and the Code of the City of Northampton. This report documents the proposed Stormwater Management Plan and that plan’s compliance with those standards. I. Introduction The proposed project includes the construction of 3,800 linear feet of eight-foot wide paved asphalt trail through the 115-acre Burts Bog Conservation Area. The trail links three Florence neighborhoods with access points at Burts Pit Road, Overlook Drive, and Sandy Hill Road. It will serve as the northernmost leg of the planned Rocky Hill Greenway. The project location is shown in Figure 1. The work includes selective clearing along the trail corridor, construction of the asphalt pavement and stormwater improvements. The conservation area includes deciduous and coniferous woodlands, wooded swamps, a bog and several vernal pools. There is also a small cleared meadow area. The proposed trail project site is mostly wooded with a portion of a wooded wetland buffer. To the extent that runoff leaves the existing conservation area, the majority is tributary to the Mill River to the north and a smaller portion is tributary to Parsons Brook to the South. The topography is highly variable and the on-site wetlands and bog appear to control some of the runoff. In addition, the on-site soils in the northern part of the conservation area are very porous and infiltrate runoff. The conservation area is bordered by residential developments. The development of the trail will not significantly alter the existing drainage patterns. Approximately one fifth of the trail is within the Parsons Brook drainage area and the remainder is in the Mill river drainage area. Soil Data NRCS Soil Survey The NRCS Soil Survey reports that the conservation area consists of fine sandy loam soils of Hydrologic Soil Group (HSG) C and D to the south and loamy sand, HSG A and B, areas to the north. The bog area to the east includes Freetown muck and Udorthents, HSG B and D. The NRCS Soil Report for the site is attached in Appendix A. The proposed trail will be constructed in areas of C and D soils to the south and A and B soils to the north. II. Existing Conditions For this linear project, the conservation area boundary is used as the drainage study area. An Existing Conditions Plan, including soil type boundaries and extent, is shown on Figure 2. Figure 3 illustrates on site resources including wetlands, vernal pools and the Zone II watershed protection area. The majority of the conservation area is wooded and includes soils from all four hydrologic soil Rocky Hill Bike Trail – Burts Bog Conservation Area April 2, 2019 Northampton, Massachusetts Stormwater Management Report The Berkshire Design Group, Inc. Page 2 groups. Approximately 80 percent of the site soils are classified as hydrologic group C and D and 20 percent are A and B soils. HSG C and D soils cover the southern part of the conservation area. Runoff from these areas is tributary to Parsons Brook to the south, the Mill River to the north, and the on-site bog and wetlands. HSG A and B soils cover the northern part of the conservation area. Runoff from this area is largely infiltrated within an existing sandy plateau. Additional runoff is directed to an intermittent stream which outlets at Stone Ridge Drive and is tributary to the Mill River. III. Proposed Conditions The proposed trail is shown on Figure 4. The trail alignment meets the goals of connecting Burts Pit Road, Overlook Drive and Stone Ridge Drive, and avoids large existing trees and other resources. The alignment also generally follows the existing dirt path location. The trail surface modifies 0.7 acres of existing cover to impervious cover. Approximately one third of the trail is within the A/B soil area to the north and the remainder is within the C/D area to the south. Given the small impervious cover of the trail, its linear nature and the size of the conservation area, the trail construction does not significantly impact runoff. The proposed drainage design focuses on transmitting runoff safely across the trail, protecting water quality and providing for stormwater recharge where feasible. IV. Calculations and Design Water Quantity Drainage calculations were performed on HydroCAD Stormwater Modeling System version 10.0 using Soil Conservation Service (SCS) TR-20 methodology. The SCS method is based on rainfall observations, which were used to develop the Intensity-Duration-Frequency relationship, or IDF curve. The mass curve is a dimensionless distribution of rainfall over time, which indicates the fraction of the rainfall event that occurs at a given time within a 24-hour precipitation event. This synthetic distribution develops peak rates for storms of varying duration and intensities. The SCS distribution provides a cumulative rainfall at any point in time and allows volume-dependent routing runoff calculations to occur. The watershed boundary for calculation purposes is the conservation area boundary. The curve numbers (CNs) and times of concentration for the existing and proposed areas are based on the soil type and the existing and proposed cover conditions at the site. Design storm intensity is based on data from the Northeast Regional Climate Center (NRCC) extreme precipitation tables, which provide a conservative design accounting for changes in climate and increases in storm intensity over time. Calculations were performed for the 2-, 10-, and 100-year frequency storms under existing and proposed conditions. The results of the calculations are presented in Table 1 below. Appendix B presents the HydroCAD output reports. Rocky Hill Bike Trail – Burts Bog Conservation Area April 2, 2019 Northampton, Massachusetts Stormwater Management Report The Berkshire Design Group, Inc. Page 3 Table 1. Runoff Summary Table for Conservation Area Condition & Point of Analysis 2-Year Storm 3.05” 10-Year Storm 4.50” 100-Year Storm 7.62” Peak Flow Rate (cfs) Peak Flow Rate (cfs) Peak Flow Rate (cfs) Existing 44.54 110.41 282.17 Proposed 44.54 110.41 282.17 The model shows zero net change in stormwater runoff leaving the conservation area for each design storm. The limited impervious cover of the trail and its linear nature result in no impact to peak flows from the conservation area. Water Quality With regard to water quality, the proposed trail creates a relatively low impact based on its linear nature and proposed use. The design of the trail allows sheet flow off its entire length. Sheet flow is directed to vegetated areas or vegetated swales within the conservation area. The proposed use of the project will not include motor vehicle use of the trail or winter plowing which will limit the production of TSS. Because of the low impact nature of the project, LID credit No. 3 is applicable for most of the trail length. LID credit no. 3 reduces the amount of recharge and treatment required. Approximately 13,560 sq. ft. of impervious area sheet flows toward qualifying areas and is excluded from water quality calculations under LID Credit 3. Four rain garden areas are proposed. The runoff which is treated by a rain garden would attain 90% TSS removal rate. In the areas where the trail is built on HSG A soils recharge will also be achieved. Groundwater conditions in rain garden locations will be confirmed during construction. Rain gardens located in C/D soils would act as wet bottom water quality swales. Calculations supporting these conclusions are included in Appendices C and D. Water quality is calculated for each section of the trail as follows (see figures 5-10 for details of each area): Area 1 Runoff from impervious area is treated by sheet flow over vegetated areas. Impervious Area: 3,632 sq. ft. Net Removal: Excluded under LID Credit 3 Area 2 Runoff from impervious area is treated by sheet flow over vegetated areas. Impervious Area: 3,792 sq. ft. Net Removal: Excluded under LID Credit 3 Rocky Hill Bike Trail – Burts Bog Conservation Area April 2, 2019 Northampton, Massachusetts Stormwater Management Report The Berkshire Design Group, Inc. Page 4 Area 3 Runoff from impervious area is treated by sheet flow over vegetated areas. Impervious Area: 1,552 sq. ft. Net Removal: Excluded under LID Credit 3 Area 4 Runoff from impervious areas is treated by sheet flow over vegetated areas and then channeled to a rain garden/wet-bottom water quality swale (TBD based on soil conditions). Impervious Area: 3,936 sq. ft. Net Removal: 70-90% Area 5 No impervious area. Area 6 Runoff from impervious areas is treated by sheet flow over vegetated areas. Impervious Area: 1,376 sq. ft. Net Removal: Excluded under LID Credit 3 Area 7 Runoff from impervious areas is treated by sheet flow over vegetated areas. Impervious Area: 3,208 sq. ft. Net Removal: Excluded under LID Credit 3 Area 8 Runoff from impervious areas is treated by either sheet flow over vegetated areas or a rain garden. Impervious Area total 4,920 sq. ft.: 1,840 sq. ft. (sheet flow); 3,080 sq. ft. (rain garden) Net Removal: 45% to 90% Area 9 Runoff from impervious areas is treated by rain gardens. Impervious Area: 5,432 sq. ft. Net Removal: 90% Area 10 Runoff from impervious areas is partially treated by stone diaphragms and sheet flow over vegetated areas (steep terrain). Impervious Area: 2,800 sq. ft. Net Removal: undetermined Rocky Hill Bike Trail – Burts Bog Conservation Area April 2, 2019 Northampton, Massachusetts Stormwater Management Report The Berkshire Design Group, Inc. Page 5 Runoff Conveyance along Trail Corridor The trail generally follows existing paths through the conservation area which are located at the higher elevations. Nevertheless, the construction of the trail above existing grade will create a barrier to runoff. A detailed analysis of each drainage area created by the trail has been completed to ensure that stormwater runoff is controlled without erosion. Figures 5 through 10 provide a detailed analysis of the drainage areas and proposed conveyance of runoff under the trail. As is standard practice, the 25-year storm has been used as the design storm for conveyances. The rainfall value for the 25-year storm has been obtained from NRCC’s Extreme precipitation table for the site location. The 25-year storm 24-hour precipitation is 5.50 inches. The extreme precipitation table considers climate change trends on a regional basis. Both culverts and drainage lenses have been chosen to convey stormwater. The areas are summarized as follows: Area 1 The pervious portion of Area 1 (0.49 ac.) is conveyed through a 12” RCP culvert from the west side of the trail to the east side. Area 2 The pervious portion of Area 2 (0.78 ac.) is conveyed through a 12” RCP culvert from the east side of the trail to the west side. Area 3 Overlook drive spur - A 12” RCP culvert conveys runoff from the south side of the trail to the north side from the pervious portion (1 acre). Area 4 A 12” RCP culvert is proposed to convey runoff from the south side of the trail to the northwest side and into a rain garden. Drainage area includes 0.4 acres of wooded and impervious surfaces. Area 5 A 12” RCP culvert conveys runoff from the east side of the trail to the northwest side and into a rain garden. Drainage area includes existing pervious area of 0.94 acres. Area 6 Twenty-five feet drainage lens allows runoff from the east side of the trail to move to the northwest side from a 0.25 acre drainage area (existing cover). Area 7 Two-25 ft. drainage lens and a 12” RCP culvert convey the majority of the runoff from the east side of the trail to the northwest side from a 5.1 acre drainage area (existing cover). Area 8 A 12” culvert conveys the runoff from the west side of the trail to the east side for 1.23 acres of wooded and impervious surfaces. Area 9 Rocky Hill Bike Trail – Burts Bog Conservation Area April 2, 2019 Northampton, Massachusetts Stormwater Management Report The Berkshire Design Group, Inc. Page 6 A 12” culvert convey the runoff from the west side of the trail to the east side for 9.45 acres of wooded and impervious cover. Area 10 This portion of the trail is a series of switchbacks down to Stone Ridge Drive. Given the high infiltration capacity of the soils in this 0.48 acre drainage area, and the existing slopes, no conveyance is required. Runoff will follow existing patterns towards Stone Ridge Drive. Any excess runoff will enter the existing storm drain system within Stone Ridge Drive. (approx. 200 ft down stone ridge drive) See Appendix E for a summary table of runoff conveyances along the trail corridor. Culverts are primarily provided at low points in the trail where runoff is naturally concentrated. Drainage lenses are used where runoff is more dispersed over the terrain. Drainage lenses are used in Areas 6 and 7, zones which are currently wet, to allow for low volume water flow along significant lengths of the trail. The lenses allow unconcentrated flow to move from one side of the trail to the other. The drainage lens design has been enhanced with the addition of perforated pipes which will act as an emergency relief underdrain if the lens becomes saturated. The 6” pipes will be plugged on the uphill side so that they do not become direct conveyances for runoff. The plug can also serve as a place for maintenance if it is found that the drainage lenses diminish in effectiveness over time. Appendix E provides a conservative approximation of the capacity of the drainage lenses based on Darcy’s law and the permeability of the drainage stone, anticipated hydraulic gradient, and flow cross sectional area. Since drainage areas 6 and 7 are not located at significant low points, any flow which does not cross the trail from those drainage areas will simply sheet flow downstream into the next culvert or the existing intermittent stream. The drainage lenses should therefore not cause any nuisance issues since flow will never be blocked even in the unlikely event of their failure. Erosion & Sedimentation Control The project plan set includes provisions for erosion control during construction. Trail construction is expected to proceed in a linear fashion, with limited disturbance sufficient to install the trail and trail edges quickly stabilized into the final condition. “Silt soxx” are proposed for down-slope protection for ease of transport, installation and removal. At culvert locations, a silt fence barrier is proposed downstream of the culvert and level spreader installation. Similarly, silt fence is proposed downstream of the rain garden located at the Overlook Drive trail installation. Soil stockpiles will be located away from drainage conveyances. Sediment controls such as “silt soxx” or silt fence shall be placed around the perimeter of the stockpiles. V. MADEP Stormwater Standards Compliance The following section details how the project will meet the DEP Stormwater Management Policy’s ten stormwater management standards. Rocky Hill Bike Trail – Burts Bog Conservation Area April 2, 2019 Northampton, Massachusetts Stormwater Management Report The Berkshire Design Group, Inc. Page 7 LID Low-impact design principals were considered during the development of the stormwater management plan for this project and have been implemented to the extent practicable. Runoff from the trail is directed via sheet flow to vegetated pervious areas. The site design also includes four rain gardens for water quality improvement. On the northern end of the site, the vast majority of stormwater will infiltrate to groundwater. Credit No. 3: “Roadway, driveway or parking lot runoff directed to qualifying area” is proposed for portions of the site which meet the criteria for the credit. Standard 1 - Untreated Stormwater Discharge Trail runoff will be treated with sheet flow over vegetated pervious areas and storage and filtration within rain gardens. The proposed culverts and drainage lenses will convey runoff from existing woodlands and treated trail runoff. The proposed site does not discharge runoff directly to wetland areas. Standard 2 - Post-Development Peak Discharge Rates Calculated post-development peak discharge rates do not change from pre-development peak discharge rates for the conservation area. These results are discussed in detail under “Peak Runoff Rate” in Section IV, above. Standard 3 - Recharge to Groundwater Groundwater recharge is analyzed under the 2-year design storm. Groundwater recharge is proposed within the four proposed rain gardens. As shown in Table 2 Appendix C, the recharge from each rain garden exceeds the required volume for the applicable drainage areas. LID credit No. 3 reduces the amount of recharge required for this project. Standard 4 – Water Quality The impervious area created by the proposed trail is treated by sheet flow across vegetated area with slope <5% in most areas of the site. A portion of the impervious area is also captured and treated within rain gardens. Those areas will achieve 90% TSS removal. In drainage areas 4 and 8, soil conditions may cause these basins to behave as wet-bottom water quality swales, which provide 70% TSS removal. The design emphasizes sheet flow over vegetated areas to avoid concentrating flows and the resulting potential erosion. The poor quality of the soils over 63% of the project also make it impractical to site and design facilities to enhance water quality and provide recharge. LID credit No. 3 reduces the water quality volume required for this project. Further discussion of this standard is included under “Water Quality” in Section IV. Rocky Hill Bike Trail – Burts Bog Conservation Area April 2, 2019 Northampton, Massachusetts Stormwater Management Report The Berkshire Design Group, Inc. Page 8 Standard 5 - Higher Potential Pollutant Loads The proposed project is not expected to yield high potential pollutant loads. Standard 6 - Protection of Critical Areas A portion of the project (drainage areas 8, 9 and 10) is located within a Zone II drinking water protection area. In drainage areas 8 and 9, runoff from the proposed trail is treated by sheet flow over vegetated areas which provides 45% TSS removal and meets the 44% requirement. In addition, three rain gardens have been sited in the water protection area to provide further treatment. Meeting the 44% removal requirement for Zone II drinking water protection is impractical in drainage area 10, where the steep existing grade requires switchbacks to join Stone Ridge Drive. In this area 40 linear feet of water quality stone diaphragms have been provided where the slope allows. A dense vegetative cover on the disturbed and new slopes should allow sheet flow and provide additional water quality. Runoff from this area flows off-site to the Stone Ridge Drive stormwater treatment facility. There are no plans for motor vehicle use of the trail or winter plowing. This will limit the production of TSS. Standard 7 - Redevelopment Projects This project is not a redevelopment project. Standard 8 - Erosion/Sediment Control A proposed Erosion & Sediment Control Plan has been developed, and is shown in the plan set. A full Stormwater Pollution Prevention Plan will be developed by the contractor prior to any disturbance of the site. Standard 9 - Operation/Maintenance Plan An Operation and Maintenance Plan for the proposed project is included in Appendix F. It includes general controls for construction and long term maintenance of the stormwater management system. Standard 10 – Prohibition of Illicit Discharges An Illicit Discharge Compliance Statement is included with this report. See Appendix G. Rocky Hill Bike Trail – Burts Bog Conservation Area Northampton, Massachusetts Stormwater Management Report The Berkshire Design Group, Inc. FIGURES PROJECT LOCATION Checked By: Drawn By: Revisions Scale: Date:Sheet Number This drawing is not intended nor shall it be used for construction purposes unless the signed professional seal of a registered landscape architect, civil engineer or land surveyor employed by The Berkshire Design Group, Inc. is affixed above. Web: http://www.berkshiredesign.com Email: bdg@berkshiredesign.com (413) 582-7000 4 Allen Place, Northampton, Massachusetts 01060 FAX (413) 582-7005 Landscape Architecture Civil Engineering Planning Berkshire Group, Inc. Design The Do not scale drawing for quantity take-offs or construction. Use written dimensions only. If dimensions are incomplete, contact The Berkshire Design Group Inc. for clarification. Land Surveying Copyright The Berkshire Design Group, Inc. This drawing and all of its contents are the express property of The Berkshire Design Group, Inc., and shall not be copied or used in any way without the written consent of The BerkshireDesign Group, Inc. c ROCKY HILL BIKE TRAIL NORTHAMPTON, MASSACHUSETTS FIG1 MARCH 27, 2019 1"=1000' LC LOCATION PLAN 0 20001000500 3000 Overlook D r i v e Stone Ridge DriveSandy Hill RoadBrookwoo d D r i v e Florence RoadBurts Pit Roa dWoods RoadAcrebrook DriveS S Painted Water Line S S T 100' Wetland Buffer 100' Wetland Buffer 100' We t l a n d B u f f e r Post & RailFence EXISTING DRAINAGE AREA HSG A SOILS: 15.36 AC. SOIL TYPE BOUNDARY (TYP.) EXISTING PATH (TYP.) CONSERVATION AREA = 115.17 AC. EXISTING DRAINAGE AREAHSG B SOILS: 5.45 AC. EXISTING DRAINAGE AREA HSG C SOILS: 43.29 AC. EXISTING DRAINAGE AREA HSG D SOILS: 51.06 AC. EXISTING DRAINAGE AREA TOTAL: 115.17 AC. WOODED A-WOODED: 15.36 AC. B-WOODED: 5.45 AC. C-WOODED: 43.29 AC. D-WOODED: 51.07 AC. Checked By: Drawn By: Revisions Scale: Date:Sheet Number This drawing is not intended nor shall it be used for construction purposes unless the signed professional seal of a registered landscape architect, civil engineer or land surveyor employed by The Berkshire Design Group, Inc. is affixed above. Web: http://www.berkshiredesign.com Email: bdg@berkshiredesign.com (413) 582-70004 Allen Place, Northampton, Massachusetts 01060FAX (413) 582-7005 Landscape Architecture Civil Engineering Planning Berkshire Group, Inc. Design The Do not scale drawing for quantity take-offs or construction. Usewritten dimensions only. If dimensions are incomplete, contact The Berkshire Design Group Inc. for clarification. Land Surveying Copyright The Berkshire Design Group, Inc. This drawing and all of its contents are the express property ofThe Berkshire Design Group, Inc., and shall not be copied or used in any way without the written consent of The Berkshire Design Group, Inc. c ROCKY HILL BIKE TRAIL NORTHAMPTON, MASSACHUSETTS FIG2 APRIL 2, 2019 1"=250' LC EXISTING CONDITIONS SOILS 0 500250125 750 Overlook D r i v e Stone Ridge DriveSandy Hill RoadFlorence RoadBurts Pit Roa dWoods RoadAcrebrook DriveS Painted SMHRim=313.51' S S T "Burt's Bog" "Children" "Stone Ridge D r " 100' Wetland Buffer 100' Wetland Buffer 100' Wetl a n d B u f f e r Bituminous CurbBituminous Curb Post & RailFence EXISTING ZONE II WELLHEAD PROTECTION AREA ZONE II WELLHEADPROTECTION AREABOUNDARY EX. WETLAND (TYP.) MAPPEDWETLANDS CERTIFIED VERNAL POOL (TYP.) PROTECTED TURTLEGATHERING AREA Checked By: Drawn By: Revisions Scale: Date:Sheet Number This drawing is not intended nor shall it be used for construction purposes unless the signed professional seal of a registered landscape architect, civil engineer or land surveyor employed by The Berkshire Design Group, Inc. is affixed above. Web: http://www.berkshiredesign.com Email: bdg@berkshiredesign.com (413) 582-70004 Allen Place, Northampton, Massachusetts 01060FAX (413) 582-7005 Landscape Architecture Civil Engineering Planning Berkshire Group, Inc. Design The Do not scale drawing for quantity take-offs or construction. Usewritten dimensions only. If dimensions are incomplete, contact The Berkshire Design Group Inc. for clarification. Land Surveying Copyright The Berkshire Design Group, Inc. This drawing and all of its contents are the express property ofThe Berkshire Design Group, Inc., and shall not be copied or used in any way without the written consent of The Berkshire Design Group, Inc. c ROCKY HILL BIKE TRAIL NORTHAMPTON, MASSACHUSETTS FIG3 APRIL 2, 2019 1"=250' LC EXISTING CONDITIONS RESOURCES 0 500250125 750 Overlook D r i v e Stone Ridge DriveSandy Hill RoadBrookwoo d D r i v e Florence RoadBurts Pit Roa dWoods RoadAcrebrook DriveS S S S T 100' Wetland Buffer 100' Wetland Buffer 100' We t l a n d B u f f e r EXISTING ZONE IIWELLHEADPROTECTION AREA ZONE II WELLHEAD PROTECTION AREA BOUNDARY EX. WETLAND(TYP.) MAPPEDWETLANDS CERTIFIED VERNAL POOL (TYP.) PROTECTED TURTLEGATHERING AREA PROPOSED DRAINAGE AREA TOTAL: 115.17 AC. A-WOODED: 15.13 AC. B-WOODED: 5.42 AC. C-WOODED: 42.94 AC. D-WOODED: 50.98 AC.IMPERVIOUS: 0.70 AC. PROPOSED DRAINAGE AREA HSG A SOILS: 15.12 AC. PROPOSED DRAINAGE AREAHSG B SOILS: 5.42 AC. PROPOSED DRAINAGE AREAHSG D SOILS: 50.97AC. PROPOSED DRAINAGE AREAHSG C SOILS: 42.94 AC. SOIL TYPE BOUNDARY (TYP.) PROPOSED TRAIL Checked By: Drawn By: Revisions Scale: Date:Sheet Number This drawing is not intended nor shall it be used for construction purposes unless the signed professional seal of a registered landscape architect, civil engineer or land surveyor employed by The Berkshire Design Group, Inc. is affixed above. Web: http://www.berkshiredesign.com Email: bdg@berkshiredesign.com (413) 582-70004 Allen Place, Northampton, Massachusetts 01060FAX (413) 582-7005 Landscape Architecture Civil Engineering Planning Berkshire Group, Inc. Design The Do not scale drawing for quantity take-offs or construction. Usewritten dimensions only. If dimensions are incomplete, contact The Berkshire Design Group Inc. for clarification. Land Surveying Copyright The Berkshire Design Group, Inc. This drawing and all of its contents are the express property ofThe Berkshire Design Group, Inc., and shall not be copied or used in any way without the written consent of The Berkshire Design Group, Inc. c ROCKY HILL BIKE TRAIL NORTHAMPTON, MASSACHUSETTS FIG4 APRIL 2, 2019 1"=250' LC PROPOSED CONDITIONS 0 500250125 750 5 9 1 2 3 4 7 8 6 10 Checked By: Drawn By: Revisions Scale: Date:Sheet Number This drawing is not intended nor shall it be used for construction purposes unless the signed professional seal of a registered landscape architect, civil engineer or land surveyor employed by The Berkshire Design Group, Inc. is affixed above. Web: http://www.berkshiredesign.com Email: bdg@berkshiredesign.com (413) 582-70004 Allen Place, Northampton, Massachusetts 01060FAX (413) 582-7005 Landscape Architecture Civil Engineering Planning Berkshire Group, Inc. Design The Do not scale drawing for quantity take-offs or construction. Usewritten dimensions only. If dimensions are incomplete, contact The Berkshire Design Group Inc. for clarification. Land Surveying Copyright The Berkshire Design Group, Inc. This drawing and all of its contents are the express property ofThe Berkshire Design Group, Inc., and shall not be copied or used in any way without the written consent of The Berkshire Design Group, Inc. c ROCKY HILL BIKE TRAIL NORTHAMPTON, MASSACHUSETTS FIG5 APRIL 2, 2019 1"=250' LC PROPOSED TRAIL DRAINAGE AREAS 0 500250125 750 322 312 312 313 314 315 320 322 3 1 3 BURTS P I T ROAD 1 322 320 32 0 320320 322 3 1 8 31 5 324 2 Checked By: Drawn By: Revisions Scale: Date:Sheet Number This drawing is not intended nor shall it be used for construction purposes unless the signed professional seal of a registered landscape architect, civil engineer or land surveyor employed by The Berkshire Design Group, Inc. is affixed above. Web: http://www.berkshiredesign.com Email: bdg@berkshiredesign.com (413) 582-70004 Allen Place, Northampton, Massachusetts 01060FAX (413) 582-7005 Landscape Architecture Civil Engineering Planning Berkshire Group, Inc. Design The Do not scale drawing for quantity take-offs or construction. Usewritten dimensions only. If dimensions are incomplete, contact The Berkshire Design Group Inc. for clarification. Land Surveying Copyright The Berkshire Design Group, Inc. This drawing and all of its contents are the express property ofThe Berkshire Design Group, Inc., and shall not be copied or used in any way without the written consent of The Berkshire Design Group, Inc. c ROCKY HILL BIKE TRAIL NORTHAMPTON, MASSACHUSETTS FIG6 APRIL 2, 2019 1"=50' LC PROPOSED CONDITIONS 0 1005025 150 312 5314 315315315314 311 313 320 310 310 309 310 3 4 312 315315 314 6 311312 313 OVERLOOK DR.Checked By: Drawn By: Revisions Scale: Date:Sheet Number This drawing is not intended nor shall it be used for construction purposes unless the signed professional seal of a registered landscape architect, civil engineer or land surveyor employed by The Berkshire Design Group, Inc. is affixed above. Web: http://www.berkshiredesign.com Email: bdg@berkshiredesign.com (413) 582-70004 Allen Place, Northampton, Massachusetts 01060FAX (413) 582-7005 Landscape Architecture Civil Engineering Planning Berkshire Group, Inc. Design The Do not scale drawing for quantity take-offs or construction. Usewritten dimensions only. If dimensions are incomplete, contact The Berkshire Design Group Inc. for clarification. Land Surveying Copyright The Berkshire Design Group, Inc. This drawing and all of its contents are the express property ofThe Berkshire Design Group, Inc., and shall not be copied or used in any way without the written consent of The Berkshire Design Group, Inc. c ROCKY HILL BIKE TRAIL NORTHAMPTON, MASSACHUSETTS FIG7 APRIL 2, 2019 1"=50' LC PROPOSED CONDITIONS 0 1005025 150 314315310 312 7 6 311300312 305310305300 295 Checked By: Drawn By: Revisions Scale: Date:Sheet Number This drawing is not intended nor shall it be used for construction purposes unless the signed professional seal of a registered landscape architect, civil engineer or land surveyor employed by The Berkshire Design Group, Inc. is affixed above. Web: http://www.berkshiredesign.com Email: bdg@berkshiredesign.com (413) 582-70004 Allen Place, Northampton, Massachusetts 01060FAX (413) 582-7005 Landscape Architecture Civil Engineering Planning Berkshire Group, Inc. Design The Do not scale drawing for quantity take-offs or construction. Usewritten dimensions only. If dimensions are incomplete, contact The Berkshire Design Group Inc. for clarification. Land Surveying Copyright The Berkshire Design Group, Inc. This drawing and all of its contents are the express property ofThe Berkshire Design Group, Inc., and shall not be copied or used in any way without the written consent of The Berkshire Design Group, Inc. c ROCKY HILL BIKE TRAIL NORTHAMPTON, MASSACHUSETTS FIG8 APRIL 2, 2019 1"=50' LC PROPOSED CONDITIONS 0 1005025 150 8 295294291292 291290285 290294294290286295 2 9 0 2 8 9 288287289295295 297 298 290289288287Checked By: Drawn By: Revisions Scale: Date:Sheet Number This drawing is not intended nor shall it be used for construction purposes unless the signed professional seal of a registered landscape architect, civil engineer or land surveyor employed by The Berkshire Design Group, Inc. is affixed above. Web: http://www.berkshiredesign.com Email: bdg@berkshiredesign.com (413) 582-70004 Allen Place, Northampton, Massachusetts 01060FAX (413) 582-7005 Landscape Architecture Civil Engineering Planning Berkshire Group, Inc. Design The Do not scale drawing for quantity take-offs or construction. Usewritten dimensions only. If dimensions are incomplete, contact The Berkshire Design Group Inc. for clarification. Land Surveying Copyright The Berkshire Design Group, Inc. This drawing and all of its contents are the express property ofThe Berkshire Design Group, Inc., and shall not be copied or used in any way without the written consent of The Berkshire Design Group, Inc. c ROCKY HILL BIKE TRAIL NORTHAMPTON, MASSACHUSETTS FIG9 APRIL 2, 2019 1"=50' LC PROPOSED CONDITIONS 0 1005025 150 9 10 STONE RI D G E DRIVE 296 2 9 6 295 296297295 295 297 298 2972983 0 0 290 285 280 294 295 294 293 Checked By: Drawn By: Revisions Scale: Date:Sheet Number This drawing is not intended nor shall it be used for construction purposes unless the signed professional seal of a registered landscape architect, civil engineer or land surveyor employed by The Berkshire Design Group, Inc. is affixed above. Web: http://www.berkshiredesign.com Email: bdg@berkshiredesign.com (413) 582-70004 Allen Place, Northampton, Massachusetts 01060FAX (413) 582-7005 Landscape Architecture Civil Engineering Planning Berkshire Group, Inc. Design The Do not scale drawing for quantity take-offs or construction. Usewritten dimensions only. If dimensions are incomplete, contact The Berkshire Design Group Inc. for clarification. Land Surveying Copyright The Berkshire Design Group, Inc. This drawing and all of its contents are the express property ofThe Berkshire Design Group, Inc., and shall not be copied or used in any way without the written consent of The Berkshire Design Group, Inc. c ROCKY HILL BIKE TRAIL NORTHAMPTON, MASSACHUSETTS FIG 10 APRIL 2, 2019 1"=50' LC PROPOSED CONDITIONS 0 1005025 150 Rocky Hill Bike Trail – Burts Bog Conservation Area Northampton, Massachusetts Stormwater Management Report The Berkshire Design Group, Inc. Appendix A – NRCS Soil Report United States Department of Agriculture A product of the National Cooperative Soil Survey, a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local participants Custom Soil Resource Report for Hampshire County, Massachusetts, Central Part Natural Resources Conservation Service April 2, 2019 Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal, State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (http://www.nrcs.usda.gov/wps/ portal/nrcs/main/soils/health/) and certain conservation and engineering applications. For more detailed information, contact your local USDA Service Center (https://offices.sc.egov.usda.gov/locator/app?agency=nrcs) or your NRCS State Soil Scientist (http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/contactus/? cid=nrcs142p2_053951). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (NRCS) has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically. Updated information is available through the NRCS Web Soil Survey, the site for official soil survey information. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require 2 alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. 3 Contents Preface....................................................................................................................2 How Soil Surveys Are Made..................................................................................5 Soil Map..................................................................................................................8 Soil Map (BURTS BOG CONSERVATION AREA)...............................................9 Legend................................................................................................................10 Map Unit Legend (BURTS BOG CONSERVATION AREA)................................11 Map Unit Descriptions (BURTS BOG CONSERVATION AREA)........................12 Hampshire County, Massachusetts, Central Part...........................................14 31A—Walpole sandy loam, 0 to 3 percent slopes.......................................14 52A—Freetown muck, central lowland, 0 to 1 percent slopes....................15 88A—Ridgebury fine sandy loam, 0 to 3 percent slopes, very stony..........17 88B—Ridgebury fine sandy loam, 3 to 8 percent slopes, very stony..........18 253A—Hinckley loamy sand, 0 to 3 percent slopes....................................20 253B—Hinckley loamy sand, 3 to 8 percent slopes....................................22 253C—Hinckley loamy sand, 8 to 15 percent slopes..................................23 306B—Paxton fine sandy loam, 0 to 8 percent slopes, very stony.............25 306C—Paxton fine sandy loam, 8 to 15 percent slopes, very stony...........27 311B—Woodbridge fine sandy loam, 0 to 8 percent slopes, very stony.....28 311C—Woodbridge fine sandy loam, 8 to 15 percent slopes, very stony...30 314B—Woodbridge fine sandy loam, 3 to 8 percent slopes, stony.............31 398B—Wethersfield fine sandy loam, 3 to 8 percent slopes, very stony....33 398C—Wethersfield fine sandy loam, 8 to 15 percent slopes, very stony..34 651—Udorthents, smoothed.......................................................................35 727B—Enosburg fine sandy loam, 3 to 8 percent slopes...........................36 References............................................................................................................38 4 How Soil Surveys Are Made Soil surveys are made to provide information about the soils and miscellaneous areas in a specific area. They include a description of the soils and miscellaneous areas and their location on the landscape and tables that show soil properties and limitations affecting various uses. Soil scientists observed the steepness, length, and shape of the slopes; the general pattern of drainage; the kinds of crops and native plants; and the kinds of bedrock. They observed and described many soil profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The profile extends from the surface down into the unconsolidated material in which the soil formed or from the surface down to bedrock. The unconsolidated material is devoid of roots and other living organisms and has not been changed by other biological activity. Currently, soils are mapped according to the boundaries of major land resource areas (MLRAs). MLRAs are geographically associated land resource units that share common characteristics related to physiography, geology, climate, water resources, soils, biological resources, and land uses (USDA, 2006). Soil survey areas typically consist of parts of one or more MLRA. The soils and miscellaneous areas in a survey area occur in an orderly pattern that is related to the geology, landforms, relief, climate, and natural vegetation of the area. Each kind of soil and miscellaneous area is associated with a particular kind of landform or with a segment of the landform. By observing the soils and miscellaneous areas in the survey area and relating their position to specific segments of the landform, a soil scientist develops a concept, or model, of how they were formed. Thus, during mapping, this model enables the soil scientist to predict with a considerable degree of accuracy the kind of soil or miscellaneous area at a specific location on the landscape. Commonly, individual soils on the landscape merge into one another as their characteristics gradually change. To construct an accurate soil map, however, soil scientists must determine the boundaries between the soils. They can observe only a limited number of soil profiles. Nevertheless, these observations, supplemented by an understanding of the soil-vegetation-landscape relationship, are sufficient to verify predictions of the kinds of soil in an area and to determine the boundaries. Soil scientists recorded the characteristics of the soil profiles that they studied. They noted soil color, texture, size and shape of soil aggregates, kind and amount of rock fragments, distribution of plant roots, reaction, and other features that enable them to identify soils. After describing the soils in the survey area and determining their properties, the soil scientists assigned the soils to taxonomic classes (units). Taxonomic classes are concepts. Each taxonomic class has a set of soil characteristics with precisely defined limits. The classes are used as a basis for comparison to classify soils systematically. Soil taxonomy, the system of taxonomic classification used in the United States, is based mainly on the kind and character of soil properties and the arrangement of horizons within the profile. After the soil 5 scientists classified and named the soils in the survey area, they compared the individual soils with similar soils in the same taxonomic class in other areas so that they could confirm data and assemble additional data based on experience and research. The objective of soil mapping is not to delineate pure map unit components; the objective is to separate the landscape into landforms or landform segments that have similar use and management requirements. Each map unit is defined by a unique combination of soil components and/or miscellaneous areas in predictable proportions. Some components may be highly contrasting to the other components of the map unit. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The delineation of such landforms and landform segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, onsite investigation is needed to define and locate the soils and miscellaneous areas. Soil scientists make many field observations in the process of producing a soil map. The frequency of observation is dependent upon several factors, including scale of mapping, intensity of mapping, design of map units, complexity of the landscape, and experience of the soil scientist. Observations are made to test and refine the soil-landscape model and predictions and to verify the classification of the soils at specific locations. Once the soil-landscape model is refined, a significantly smaller number of measurements of individual soil properties are made and recorded. These measurements may include field measurements, such as those for color, depth to bedrock, and texture, and laboratory measurements, such as those for content of sand, silt, clay, salt, and other components. Properties of each soil typically vary from one point to another across the landscape. Observations for map unit components are aggregated to develop ranges of characteristics for the components. The aggregated values are presented. Direct measurements do not exist for every property presented for every map unit component. Values for some properties are estimated from combinations of other properties. While a soil survey is in progress, samples of some of the soils in the area generally are collected for laboratory analyses and for engineering tests. Soil scientists interpret the data from these analyses and tests as well as the field-observed characteristics and the soil properties to determine the expected behavior of the soils under different uses. Interpretations for all of the soils are field tested through observation of the soils in different uses and under different levels of management. Some interpretations are modified to fit local conditions, and some new interpretations are developed to meet local needs. Data are assembled from other sources, such as research information, production records, and field experience of specialists. For example, data on crop yields under defined levels of management are assembled from farm records and from field or plot experiments on the same kinds of soil. Predictions about soil behavior are based not only on soil properties but also on such variables as climate and biological activity. Soil conditions are predictable over long periods of time, but they are not predictable from year to year. For example, soil scientists can predict with a fairly high degree of accuracy that a given soil will have a high water table within certain depths in most years, but they cannot predict that a high water table will always be at a specific level in the soil on a specific date. After soil scientists located and identified the significant natural bodies of soil in the survey area, they drew the boundaries of these bodies on aerial photographs and Custom Soil Resource Report 6 identified each as a specific map unit. Aerial photographs show trees, buildings, fields, roads, and rivers, all of which help in locating boundaries accurately. Custom Soil Resource Report 7 Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit. 8 9 Custom Soil Resource Report Soil Map (BURTS BOG CONSERVATION AREA)46869004687100468730046875004687700468790046881004686900468710046873004687500468770046879004688100690200 690400 690600 690800 691000 691200 691400 691600 691800 692000 692200 690200 690400 690600 690800 691000 691200 691400 691600 691800 692000 692200 42° 19' 20'' N 72° 41' 34'' W42° 19' 20'' N72° 40' 2'' W42° 18' 36'' N 72° 41' 34'' W42° 18' 36'' N 72° 40' 2'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 18N WGS84 0 450 900 1800 2700 Feet 0 100 200 400 600 Meters Map Scale: 1:9,720 if printed on A landscape (11" x 8.5") sheet. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:15,800. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Hampshire County, Massachusetts, Central Part Survey Area Data: Version 13, Sep 10, 2018 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Mar 28, 2011—Apr 18, 2011 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Custom Soil Resource Report 10 Map Unit Legend (BURTS BOG CONSERVATION AREA) Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 31A Walpole sandy loam, 0 to 3 percent slopes 2.4 1.2% 52A Freetown muck, central lowland, 0 to 1 percent slopes 10.7 5.6% 88A Ridgebury fine sandy loam, 0 to 3 percent slopes, very stony 10.3 5.4% 88B Ridgebury fine sandy loam, 3 to 8 percent slopes, very stony 6.9 3.6% 253A Hinckley loamy sand, 0 to 3 percent slopes 3.8 2.0% 253B Hinckley loamy sand, 3 to 8 percent slopes 17.8 9.3% 253C Hinckley loamy sand, 8 to 15 percent slopes 0.8 0.4% 306B Paxton fine sandy loam, 0 to 8 percent slopes, very stony 7.3 3.8% 306C Paxton fine sandy loam, 8 to 15 percent slopes, very stony 14.7 7.6% 311B Woodbridge fine sandy loam, 0 to 8 percent slopes, very stony 59.7 31.1% 311C Woodbridge fine sandy loam, 8 to 15 percent slopes, very stony 2.6 1.3% 314B Woodbridge fine sandy loam, 3 to 8 percent slopes, stony 0.8 0.4% 398B Wethersfield fine sandy loam, 3 to 8 percent slopes, very stony 38.1 19.8% 398C Wethersfield fine sandy loam, 8 to 15 percent slopes, very stony 6.2 3.2% 651 Udorthents, smoothed 6.7 3.5% 727B Enosburg fine sandy loam, 3 to 8 percent slopes 3.6 1.9% Totals for Area of Interest 192.3 100.0% Custom Soil Resource Report 11 Map Unit Descriptions (BURTS BOG CONSERVATION AREA) The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the Custom Soil Resource Report 12 basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha-Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. Custom Soil Resource Report 13 Hampshire County, Massachusetts, Central Part 31A—Walpole sandy loam, 0 to 3 percent slopes Map Unit Setting National map unit symbol: 2svkl Elevation: 0 to 1,020 feet Mean annual precipitation: 36 to 71 inches Mean annual air temperature: 39 to 55 degrees F Frost-free period: 140 to 250 days Farmland classification: Not prime farmland Map Unit Composition Walpole and similar soils: 80 percent Minor components: 20 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Walpole Setting Landform: Depressions, deltas, depressions, outwash plains, outwash terraces Landform position (two-dimensional): Toeslope Landform position (three-dimensional): Tread, dip, talf Down-slope shape: Concave Across-slope shape: Concave Parent material: Sandy glaciofluvial deposits derived from igneous, metamorphic and sedimentary rock Typical profile Oe - 0 to 1 inches: mucky peat A - 1 to 7 inches: sandy loam Bg - 7 to 21 inches: sandy loam BC - 21 to 25 inches: gravelly sandy loam C - 25 to 65 inches: very gravelly sand Properties and qualities Slope: 0 to 3 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Poorly drained Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high (0.14 to 14.17 in/hr) Depth to water table: About 0 to 4 inches Frequency of flooding: None Frequency of ponding: None Salinity, maximum in profile: Nonsaline (0.0 to 1.9 mmhos/cm) Available water storage in profile: Moderate (about 6.4 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4w Hydrologic Soil Group: B/D Hydric soil rating: Yes Custom Soil Resource Report 14 Minor Components Scarboro Percent of map unit: 10 percent Landform: Deltas, outwash terraces, outwash plains Landform position (two-dimensional): Toeslope Landform position (three-dimensional): Tread, dip Down-slope shape: Concave Across-slope shape: Concave Hydric soil rating: Yes Sudbury Percent of map unit: 10 percent Landform: Deltas, terraces, outwash plains Landform position (two-dimensional): Footslope Landform position (three-dimensional): Tread, dip Down-slope shape: Concave Across-slope shape: Linear Hydric soil rating: No 52A—Freetown muck, central lowland, 0 to 1 percent slopes Map Unit Setting National map unit symbol: 2t2qf Elevation: 90 to 580 feet Mean annual precipitation: 36 to 53 inches Mean annual air temperature: 41 to 54 degrees F Frost-free period: 140 to 220 days Farmland classification: Farmland of unique importance Map Unit Composition Freetown and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Freetown Setting Landform: Bogs, swamps, kettles, depressions, marshes, depressions Landform position (two-dimensional): Toeslope Landform position (three-dimensional): Tread, dip Down-slope shape: Concave Across-slope shape: Concave Parent material: Highly decomposed organic material Typical profile Oe - 0 to 2 inches: mucky peat Oa - 2 to 79 inches: muck Custom Soil Resource Report 15 Properties and qualities Slope: 0 to 1 percent Percent of area covered with surface fragments: 0.0 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Very poorly drained Runoff class: Negligible Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high (0.14 to 14.17 in/hr) Depth to water table: About 0 to 6 inches Frequency of flooding: Rare Frequency of ponding: Frequent Available water storage in profile: Very high (about 19.2 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 5w Hydrologic Soil Group: B/D Hydric soil rating: Yes Minor Components Swansea Percent of map unit: 5 percent Landform: Kettles, bogs, swamps, marshes, depressions, depressions Landform position (two-dimensional): Toeslope Landform position (three-dimensional): Tread, dip Down-slope shape: Concave Across-slope shape: Concave Hydric soil rating: Yes Scarboro Percent of map unit: 5 percent Landform: Drainageways, depressions Landform position (two-dimensional): Toeslope Landform position (three-dimensional): Base slope, tread, dip Down-slope shape: Concave Across-slope shape: Concave Hydric soil rating: Yes Whitman Percent of map unit: 5 percent Landform: Drainageways, depressions Landform position (two-dimensional): Toeslope Landform position (three-dimensional): Base slope Down-slope shape: Concave Across-slope shape: Concave Hydric soil rating: Yes Custom Soil Resource Report 16 88A—Ridgebury fine sandy loam, 0 to 3 percent slopes, very stony Map Unit Setting National map unit symbol: 2xffq Elevation: 90 to 1,190 feet Mean annual precipitation: 36 to 71 inches Mean annual air temperature: 39 to 55 degrees F Frost-free period: 140 to 240 days Farmland classification: Not prime farmland Map Unit Composition Ridgebury, very stony, and similar soils: 80 percent Minor components: 20 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Ridgebury, Very Stony Setting Landform: Hills, ground moraines, drumlins, depressions, drainageways Landform position (two-dimensional): Toeslope, footslope Landform position (three-dimensional): Base slope, head slope Down-slope shape: Concave Across-slope shape: Concave Parent material: Coarse-loamy lodgment till derived from gneiss, granite, and/or schist Typical profile Oe - 0 to 1 inches: moderately decomposed plant material A - 1 to 6 inches: fine sandy loam Bw - 6 to 10 inches: sandy loam Bg - 10 to 19 inches: gravelly sandy loam Cd - 19 to 66 inches: gravelly sandy loam Properties and qualities Slope: 0 to 3 percent Percent of area covered with surface fragments: 1.6 percent Depth to restrictive feature: 15 to 35 inches to densic material Natural drainage class: Poorly drained Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately low (0.00 to 0.14 in/hr) Depth to water table: About 0 to 6 inches Frequency of flooding: None Frequency of ponding: None Salinity, maximum in profile: Nonsaline (0.0 to 1.9 mmhos/cm) Available water storage in profile: Low (about 3.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 5s Custom Soil Resource Report 17 Hydrologic Soil Group: D Hydric soil rating: Yes Minor Components Walpole Percent of map unit: 9 percent Landform: Outwash terraces, drainageways, depressions Landform position (three-dimensional): Tread Down-slope shape: Concave Across-slope shape: Concave Hydric soil rating: Yes Woodbridge, very stony Percent of map unit: 6 percent Landform: Ground moraines, drumlins, hills Landform position (two-dimensional): Backslope, footslope, summit Landform position (three-dimensional): Side slope, crest Down-slope shape: Convex Across-slope shape: Linear Hydric soil rating: No Whitman, very stony Percent of map unit: 3 percent Landform: Drainageways, hills, ground moraines, drumlins, depressions Landform position (two-dimensional): Toeslope Landform position (three-dimensional): Base slope Down-slope shape: Concave Across-slope shape: Concave Hydric soil rating: Yes Leicester, very stony Percent of map unit: 2 percent Landform: Drainageways, ground moraines, hills, depressions Landform position (two-dimensional): Toeslope, footslope Landform position (three-dimensional): Base slope Down-slope shape: Linear, concave Across-slope shape: Concave Hydric soil rating: Yes 88B—Ridgebury fine sandy loam, 3 to 8 percent slopes, very stony Map Unit Setting National map unit symbol: 2xffx Elevation: 40 to 1,320 feet Mean annual precipitation: 36 to 71 inches Mean annual air temperature: 39 to 55 degrees F Frost-free period: 140 to 240 days Farmland classification: Not prime farmland Custom Soil Resource Report 18 Map Unit Composition Ridgebury, very stony, and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Ridgebury, Very Stony Setting Landform: Hills, ground moraines, depressions, drumlins, drainageways Landform position (two-dimensional): Toeslope, footslope Landform position (three-dimensional): Base slope, head slope Down-slope shape: Concave Across-slope shape: Concave Parent material: Coarse-loamy lodgment till derived from gneiss, granite, and/or schist Typical profile Oe - 0 to 1 inches: moderately decomposed plant material A - 1 to 6 inches: fine sandy loam Bw - 6 to 10 inches: sandy loam Bg - 10 to 19 inches: gravelly sandy loam Cd - 19 to 66 inches: gravelly sandy loam Properties and qualities Slope: 3 to 8 percent Percent of area covered with surface fragments: 1.6 percent Depth to restrictive feature: 15 to 35 inches to densic material Natural drainage class: Poorly drained Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately low (0.00 to 0.14 in/hr) Depth to water table: About 0 to 6 inches Frequency of flooding: None Frequency of ponding: None Salinity, maximum in profile: Nonsaline (0.0 to 1.9 mmhos/cm) Available water storage in profile: Low (about 3.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4w Hydrologic Soil Group: D Hydric soil rating: Yes Minor Components Woodbridge, very stony Percent of map unit: 7 percent Landform: Hills, ground moraines, drumlins Landform position (two-dimensional): Footslope, summit, backslope Landform position (three-dimensional): Crest, side slope Down-slope shape: Convex Across-slope shape: Linear Hydric soil rating: No Whitman, very stony Percent of map unit: 4 percent Custom Soil Resource Report 19 Landform: Drainageways, hills, ground moraines, drumlins, depressions Landform position (two-dimensional): Toeslope Landform position (three-dimensional): Base slope Down-slope shape: Concave Across-slope shape: Concave Hydric soil rating: Yes Scituate, very stony Percent of map unit: 2 percent Landform: Drumlins, hills, ground moraines Landform position (two-dimensional): Summit, footslope, backslope Landform position (three-dimensional): Crest, side slope Down-slope shape: Convex, linear Across-slope shape: Convex Hydric soil rating: No Walpole Percent of map unit: 2 percent Landform: Depressions, outwash terraces, drainageways Landform position (three-dimensional): Tread Down-slope shape: Concave Across-slope shape: Concave Hydric soil rating: Yes 253A—Hinckley loamy sand, 0 to 3 percent slopes Map Unit Setting National map unit symbol: 2svm7 Elevation: 0 to 1,420 feet Mean annual precipitation: 36 to 71 inches Mean annual air temperature: 39 to 55 degrees F Frost-free period: 140 to 240 days Farmland classification: Farmland of statewide importance Map Unit Composition Hinckley and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Hinckley Setting Landform: Outwash deltas, kame terraces, outwash plains, outwash terraces Landform position (three-dimensional): Tread Down-slope shape: Convex, linear, concave Across-slope shape: Convex, linear, concave Parent material: Sandy and gravelly glaciofluvial deposits derived from gneiss and/or granite and/or schist Typical profile Oe - 0 to 1 inches: moderately decomposed plant material Custom Soil Resource Report 20 A - 1 to 8 inches: loamy sand Bw1 - 8 to 11 inches: gravelly loamy sand Bw2 - 11 to 16 inches: gravelly loamy sand BC - 16 to 19 inches: very gravelly loamy sand C - 19 to 65 inches: very gravelly sand Properties and qualities Slope: 0 to 3 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Excessively drained Runoff class: Negligible Capacity of the most limiting layer to transmit water (Ksat): Moderately high to very high (1.42 to 99.90 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Salinity, maximum in profile: Nonsaline (0.0 to 1.9 mmhos/cm) Available water storage in profile: Low (about 3.1 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3s Hydrologic Soil Group: A Hydric soil rating: No Minor Components Windsor Percent of map unit: 5 percent Landform: Outwash terraces, kame terraces, outwash deltas Landform position (three-dimensional): Tread Down-slope shape: Concave, linear, convex Across-slope shape: Linear, convex, concave Hydric soil rating: No Sudbury Percent of map unit: 5 percent Landform: Outwash terraces, outwash deltas, kame terraces Landform position (three-dimensional): Tread Down-slope shape: Concave, linear, convex Across-slope shape: Linear, concave, convex Hydric soil rating: No Merrimac Percent of map unit: 5 percent Landform: Kame terraces, outwash terraces, outwash deltas Landform position (three-dimensional): Tread Down-slope shape: Convex, concave, linear Across-slope shape: Linear, convex, concave Hydric soil rating: No Custom Soil Resource Report 21 253B—Hinckley loamy sand, 3 to 8 percent slopes Map Unit Setting National map unit symbol: 2svm8 Elevation: 0 to 1,430 feet Mean annual precipitation: 36 to 53 inches Mean annual air temperature: 39 to 55 degrees F Frost-free period: 140 to 250 days Farmland classification: Farmland of statewide importance Map Unit Composition Hinckley and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Hinckley Setting Landform: Kame terraces, kames, outwash terraces, outwash deltas, outwash plains, eskers, moraines Landform position (two-dimensional): Summit, backslope, footslope, shoulder Landform position (three-dimensional): Nose slope, side slope, base slope, crest, tread, riser Down-slope shape: Linear, convex, concave Across-slope shape: Convex, linear, concave Parent material: Sandy and gravelly glaciofluvial deposits derived from gneiss and/or granite and/or schist Typical profile Oe - 0 to 1 inches: moderately decomposed plant material A - 1 to 8 inches: loamy sand Bw1 - 8 to 11 inches: gravelly loamy sand Bw2 - 11 to 16 inches: gravelly loamy sand BC - 16 to 19 inches: very gravelly loamy sand C - 19 to 65 inches: very gravelly sand Properties and qualities Slope: 3 to 8 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Excessively drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat): Moderately high to very high (1.42 to 99.90 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Salinity, maximum in profile: Nonsaline (0.0 to 1.9 mmhos/cm) Available water storage in profile: Very low (about 3.0 inches) Custom Soil Resource Report 22 Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3s Hydrologic Soil Group: A Hydric soil rating: No Minor Components Windsor Percent of map unit: 8 percent Landform: Outwash deltas, outwash plains, kames, eskers, moraines, outwash terraces, kame terraces Landform position (two-dimensional): Summit, shoulder, backslope, footslope Landform position (three-dimensional): Nose slope, side slope, base slope, crest, riser, tread Down-slope shape: Linear, convex, concave Across-slope shape: Convex, linear, concave Hydric soil rating: No Sudbury Percent of map unit: 5 percent Landform: Outwash terraces, outwash deltas, kame terraces, outwash plains, moraines Landform position (two-dimensional): Backslope, footslope Landform position (three-dimensional): Side slope, base slope, head slope, tread Down-slope shape: Concave, linear Across-slope shape: Linear, concave Hydric soil rating: No Agawam Percent of map unit: 2 percent Landform: Eskers, moraines, outwash terraces, outwash deltas, kame terraces, outwash plains, kames Landform position (two-dimensional): Summit, shoulder, backslope, footslope Landform position (three-dimensional): Nose slope, side slope, base slope, crest, riser, tread Down-slope shape: Linear, convex, concave Across-slope shape: Convex, linear, concave Hydric soil rating: No 253C—Hinckley loamy sand, 8 to 15 percent slopes Map Unit Setting National map unit symbol: 2svm9 Elevation: 0 to 1,480 feet Mean annual precipitation: 36 to 71 inches Mean annual air temperature: 39 to 55 degrees F Frost-free period: 140 to 240 days Farmland classification: Not prime farmland Custom Soil Resource Report 23 Map Unit Composition Hinckley and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Hinckley Setting Landform: Outwash terraces, outwash deltas, kame terraces, outwash plains, kames, eskers, moraines Landform position (two-dimensional): Shoulder, toeslope, footslope, backslope Landform position (three-dimensional): Nose slope, side slope, crest, head slope, riser Down-slope shape: Linear, concave, convex Across-slope shape: Convex, linear, concave Parent material: Sandy and gravelly glaciofluvial deposits derived from gneiss and/or granite and/or schist Typical profile Oe - 0 to 1 inches: moderately decomposed plant material A - 1 to 8 inches: loamy sand Bw1 - 8 to 11 inches: gravelly loamy sand Bw2 - 11 to 16 inches: gravelly loamy sand BC - 16 to 19 inches: very gravelly loamy sand C - 19 to 65 inches: very gravelly sand Properties and qualities Slope: 8 to 15 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Excessively drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat): Moderately high to very high (1.42 to 99.90 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Salinity, maximum in profile: Nonsaline (0.0 to 1.9 mmhos/cm) Available water storage in profile: Low (about 3.1 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4e Hydrologic Soil Group: A Hydric soil rating: No Minor Components Windsor Percent of map unit: 5 percent Landform: Kames, eskers, moraines, kame terraces, outwash plains, outwash terraces, outwash deltas Landform position (two-dimensional): Shoulder, backslope, footslope, toeslope Landform position (three-dimensional): Nose slope, side slope, crest, head slope, riser Down-slope shape: Linear, concave, convex Across-slope shape: Convex, linear, concave Custom Soil Resource Report 24 Hydric soil rating: No Sudbury Percent of map unit: 5 percent Landform: Outwash terraces, kame terraces, outwash plains, moraines, outwash deltas Landform position (two-dimensional): Backslope, footslope Landform position (three-dimensional): Base slope, tread Down-slope shape: Concave, linear Across-slope shape: Linear, concave Hydric soil rating: No Merrimac Percent of map unit: 5 percent Landform: Kames, eskers, moraines, outwash terraces, outwash plains Landform position (two-dimensional): Shoulder, backslope, footslope, toeslope Landform position (three-dimensional): Side slope, crest, head slope, nose slope, riser Down-slope shape: Convex Across-slope shape: Convex Hydric soil rating: No 306B—Paxton fine sandy loam, 0 to 8 percent slopes, very stony Map Unit Setting National map unit symbol: 2w673 Elevation: 0 to 1,340 feet Mean annual precipitation: 36 to 71 inches Mean annual air temperature: 39 to 55 degrees F Frost-free period: 140 to 240 days Farmland classification: Not prime farmland Map Unit Composition Paxton, very stony, and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Paxton, Very Stony Setting Landform: Ground moraines, drumlins, hills Landform position (two-dimensional): Backslope, summit, shoulder Landform position (three-dimensional): Crest, side slope Down-slope shape: Convex, linear Across-slope shape: Linear, convex Parent material: Coarse-loamy lodgment till derived from gneiss, granite, and/or schist Typical profile Oe - 0 to 2 inches: moderately decomposed plant material A - 2 to 10 inches: fine sandy loam Custom Soil Resource Report 25 Bw1 - 10 to 17 inches: fine sandy loam Bw2 - 17 to 28 inches: fine sandy loam Cd - 28 to 67 inches: gravelly fine sandy loam Properties and qualities Slope: 0 to 8 percent Percent of area covered with surface fragments: 1.6 percent Depth to restrictive feature: 20 to 43 inches to densic material Natural drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately low (0.00 to 0.14 in/hr) Depth to water table: About 18 to 37 inches Frequency of flooding: None Frequency of ponding: None Salinity, maximum in profile: Nonsaline (0.0 to 1.9 mmhos/cm) Available water storage in profile: Low (about 4.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6s Hydrologic Soil Group: C Hydric soil rating: No Minor Components Woodbridge, very stony Percent of map unit: 8 percent Landform: Drumlins, hills, ground moraines Landform position (two-dimensional): Backslope, footslope, summit Landform position (three-dimensional): Side slope, crest Down-slope shape: Concave Across-slope shape: Linear Hydric soil rating: No Ridgebury, very stony Percent of map unit: 4 percent Landform: Hills, depressions, drainageways, drumlins, ground moraines Landform position (two-dimensional): Toeslope, footslope Landform position (three-dimensional): Base slope, head slope Down-slope shape: Concave Across-slope shape: Concave Hydric soil rating: Yes Charlton, very stony Percent of map unit: 3 percent Landform: Hills Landform position (two-dimensional): Shoulder, summit, backslope Landform position (three-dimensional): Crest, side slope Down-slope shape: Convex Across-slope shape: Convex Hydric soil rating: No Custom Soil Resource Report 26 306C—Paxton fine sandy loam, 8 to 15 percent slopes, very stony Map Unit Setting National map unit symbol: 2w677 Elevation: 0 to 1,330 feet Mean annual precipitation: 36 to 71 inches Mean annual air temperature: 39 to 55 degrees F Frost-free period: 140 to 240 days Farmland classification: Not prime farmland Map Unit Composition Paxton, very stony, and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Paxton, Very Stony Setting Landform: Hills, ground moraines, drumlins Landform position (two-dimensional): Backslope Landform position (three-dimensional): Side slope Down-slope shape: Linear, convex Across-slope shape: Convex, linear Parent material: Coarse-loamy lodgment till derived from gneiss, granite, and/or schist Typical profile Oe - 0 to 2 inches: moderately decomposed plant material A - 2 to 10 inches: fine sandy loam Bw1 - 10 to 17 inches: fine sandy loam Bw2 - 17 to 28 inches: fine sandy loam Cd - 28 to 67 inches: gravelly fine sandy loam Properties and qualities Slope: 8 to 15 percent Percent of area covered with surface fragments: 1.6 percent Depth to restrictive feature: 20 to 43 inches to densic material Natural drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately low (0.00 to 0.14 in/hr) Depth to water table: About 18 to 37 inches Frequency of flooding: None Frequency of ponding: None Salinity, maximum in profile: Nonsaline (0.0 to 1.9 mmhos/cm) Available water storage in profile: Low (about 4.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6s Custom Soil Resource Report 27 Hydrologic Soil Group: C Hydric soil rating: No Minor Components Woodbridge, very stony Percent of map unit: 8 percent Landform: Hills, ground moraines, drumlins Landform position (two-dimensional): Backslope, footslope Landform position (three-dimensional): Side slope Down-slope shape: Concave Across-slope shape: Linear Hydric soil rating: No Charlton, very stony Percent of map unit: 5 percent Landform: Hills Landform position (two-dimensional): Backslope Landform position (three-dimensional): Side slope Down-slope shape: Convex Across-slope shape: Convex Hydric soil rating: No Ridgebury, very stony Percent of map unit: 2 percent Landform: Drumlins, drainageways, hills, ground moraines, depressions Landform position (two-dimensional): Toeslope, footslope Landform position (three-dimensional): Base slope, head slope Down-slope shape: Concave Across-slope shape: Concave Hydric soil rating: Yes 311B—Woodbridge fine sandy loam, 0 to 8 percent slopes, very stony Map Unit Setting National map unit symbol: 2t2qr Elevation: 0 to 1,440 feet Mean annual precipitation: 36 to 71 inches Mean annual air temperature: 39 to 55 degrees F Frost-free period: 140 to 240 days Farmland classification: Not prime farmland Map Unit Composition Woodbridge, very stony, and similar soils: 82 percent Minor components: 18 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Woodbridge, Very Stony Setting Landform: Drumlins, hills, ground moraines Custom Soil Resource Report 28 Landform position (two-dimensional): Backslope, footslope, summit Landform position (three-dimensional): Side slope Down-slope shape: Concave Across-slope shape: Linear Parent material: Coarse-loamy lodgment till derived from gneiss, granite, and/or schist Typical profile Oe - 0 to 2 inches: moderately decomposed plant material A - 2 to 9 inches: fine sandy loam Bw1 - 9 to 20 inches: fine sandy loam Bw2 - 20 to 32 inches: fine sandy loam Cd - 32 to 67 inches: gravelly fine sandy loam Properties and qualities Slope: 0 to 8 percent Percent of area covered with surface fragments: 1.6 percent Depth to restrictive feature: 20 to 43 inches to densic material Natural drainage class: Moderately well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately low (0.00 to 0.14 in/hr) Depth to water table: About 19 to 27 inches Frequency of flooding: None Frequency of ponding: None Salinity, maximum in profile: Nonsaline (0.0 to 1.9 mmhos/cm) Available water storage in profile: Low (about 4.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6s Hydrologic Soil Group: C/D Hydric soil rating: No Minor Components Paxton, very stony Percent of map unit: 10 percent Landform: Drumlins, hills, ground moraines Landform position (two-dimensional): Shoulder, backslope, summit Landform position (three-dimensional): Crest, side slope Down-slope shape: Linear, convex Across-slope shape: Convex, linear Hydric soil rating: No Ridgebury, very stony Percent of map unit: 8 percent Landform: Depressions, drumlins, drainageways, hills, ground moraines Landform position (two-dimensional): Toeslope Landform position (three-dimensional): Base slope, head slope Down-slope shape: Concave Across-slope shape: Concave Hydric soil rating: Yes Custom Soil Resource Report 29 311C—Woodbridge fine sandy loam, 8 to 15 percent slopes, very stony Map Unit Setting National map unit symbol: 2w687 Elevation: 0 to 1,420 feet Mean annual precipitation: 36 to 71 inches Mean annual air temperature: 39 to 55 degrees F Frost-free period: 140 to 240 days Farmland classification: Not prime farmland Map Unit Composition Woodbridge, very stony, and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Woodbridge, Very Stony Setting Landform: Ground moraines, drumlins, hills Landform position (two-dimensional): Backslope, footslope Landform position (three-dimensional): Side slope Down-slope shape: Convex Across-slope shape: Linear Parent material: Coarse-loamy lodgment till derived from gneiss, granite, and/or schist Typical profile Oe - 0 to 2 inches: moderately decomposed plant material A - 2 to 9 inches: fine sandy loam Bw1 - 9 to 20 inches: fine sandy loam Bw2 - 20 to 32 inches: fine sandy loam Cd - 32 to 67 inches: gravelly fine sandy loam Properties and qualities Slope: 8 to 15 percent Percent of area covered with surface fragments: 1.6 percent Depth to restrictive feature: 20 to 43 inches to densic material Natural drainage class: Moderately well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately low (0.00 to 0.14 in/hr) Depth to water table: About 19 to 27 inches Frequency of flooding: None Frequency of ponding: None Salinity, maximum in profile: Nonsaline (0.0 to 1.9 mmhos/cm) Available water storage in profile: Low (about 5.3 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6s Custom Soil Resource Report 30 Hydrologic Soil Group: C/D Hydric soil rating: No Minor Components Paxton, very stony Percent of map unit: 9 percent Landform: Drumlins, hills, ground moraines Landform position (two-dimensional): Backslope Landform position (three-dimensional): Side slope Down-slope shape: Linear, convex Across-slope shape: Convex, linear Hydric soil rating: No Ridgebury, very stony Percent of map unit: 4 percent Landform: Depressions, drumlins, ground moraines, drainageways, hills Landform position (two-dimensional): Toeslope, footslope Landform position (three-dimensional): Base slope, head slope Down-slope shape: Concave Across-slope shape: Concave Hydric soil rating: Yes Whitman, very stony Percent of map unit: 1 percent Landform: Depressions, drainageways Down-slope shape: Concave Across-slope shape: Concave Hydric soil rating: Yes Sutton, very stony Percent of map unit: 1 percent Landform: Hills, ground moraines Landform position (two-dimensional): Footslope Landform position (three-dimensional): Base slope Down-slope shape: Concave Across-slope shape: Linear Hydric soil rating: No 314B—Woodbridge fine sandy loam, 3 to 8 percent slopes, stony Map Unit Setting National map unit symbol: 2w68m Elevation: 120 to 840 feet Mean annual precipitation: 36 to 71 inches Mean annual air temperature: 39 to 55 degrees F Frost-free period: 140 to 240 days Farmland classification: Farmland of statewide importance Map Unit Composition Woodbridge, stony, and similar soils: 85 percent Custom Soil Resource Report 31 Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Woodbridge, Stony Setting Landform: Ground moraines, drumlins, hills Landform position (two-dimensional): Summit, backslope, footslope Landform position (three-dimensional): Crest, side slope Down-slope shape: Convex Across-slope shape: Linear Parent material: Coarse-loamy lodgment till derived from gneiss, granite, and/or schist Typical profile Oe - 0 to 2 inches: moderately decomposed plant material A - 2 to 9 inches: fine sandy loam Bw1 - 9 to 20 inches: fine sandy loam Bw2 - 20 to 32 inches: fine sandy loam Cd - 32 to 67 inches: gravelly fine sandy loam Properties and qualities Slope: 3 to 8 percent Percent of area covered with surface fragments: 0.1 percent Depth to restrictive feature: 20 to 43 inches to densic material Natural drainage class: Moderately well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately low (0.00 to 0.14 in/hr) Depth to water table: About 19 to 27 inches Frequency of flooding: None Frequency of ponding: None Salinity, maximum in profile: Nonsaline (0.0 to 1.9 mmhos/cm) Available water storage in profile: Low (about 5.3 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2e Hydrologic Soil Group: C/D Hydric soil rating: No Minor Components Paxton, stony Percent of map unit: 5 percent Landform: Hills, ground moraines, drumlins Landform position (two-dimensional): Summit, shoulder, backslope Landform position (three-dimensional): Crest, side slope Down-slope shape: Linear, convex Across-slope shape: Convex, linear Hydric soil rating: No Ridgebury, stony Percent of map unit: 5 percent Landform: Ground moraines, depressions, drumlins, drainageways, hills Landform position (two-dimensional): Toeslope, footslope Landform position (three-dimensional): Head slope, base slope Custom Soil Resource Report 32 Down-slope shape: Concave Across-slope shape: Concave Hydric soil rating: Yes Charlton, stony Percent of map unit: 5 percent Landform: Hills Landform position (two-dimensional): Backslope, shoulder, summit Landform position (three-dimensional): Side slope, crest Down-slope shape: Convex Across-slope shape: Convex Hydric soil rating: No 398B—Wethersfield fine sandy loam, 3 to 8 percent slopes, very stony Map Unit Setting National map unit symbol: 9b2b Mean annual precipitation: 40 to 50 inches Mean annual air temperature: 45 to 52 degrees F Frost-free period: 140 to 240 days Farmland classification: Not prime farmland Map Unit Composition Wethersfield and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Wethersfield Setting Landform: Hills Landform position (two-dimensional): Shoulder, summit Landform position (three-dimensional): Crest Down-slope shape: Convex Across-slope shape: Convex Parent material: Friable coarse-loamy eolian deposits over firm loamy basal till derived from sandstone and shale Typical profile H1 - 0 to 9 inches: fine sandy loam H2 - 9 to 16 inches: fine sandy loam H3 - 16 to 23 inches: loam H4 - 23 to 26 inches: gravelly loam H5 - 26 to 60 inches: very gravelly fine sandy loam Properties and qualities Slope: 3 to 8 percent Percent of area covered with surface fragments: 2.0 percent Depth to restrictive feature: 20 to 31 inches to densic material Natural drainage class: Well drained Runoff class: High Custom Soil Resource Report 33 Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately high (0.00 to 0.20 in/hr) Depth to water table: About 18 to 30 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Low (about 4.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: C Hydric soil rating: No Minor Components Paxton Percent of map unit: 5 percent Hydric soil rating: No Ridgebury Percent of map unit: 5 percent Landform: Depressions Hydric soil rating: Yes Woodbridge Percent of map unit: 5 percent Hydric soil rating: No 398C—Wethersfield fine sandy loam, 8 to 15 percent slopes, very stony Map Unit Setting National map unit symbol: 9b2c Mean annual precipitation: 40 to 50 inches Mean annual air temperature: 45 to 52 degrees F Frost-free period: 140 to 240 days Farmland classification: Not prime farmland Map Unit Composition Wethersfield and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Wethersfield Setting Landform: Hills Landform position (two-dimensional): Backslope Landform position (three-dimensional): Side slope Down-slope shape: Convex Across-slope shape: Convex Custom Soil Resource Report 34 Parent material: Friable coarse-loamy eolian deposits over firm loamy basal till derived from sandstone and shale Typical profile H1 - 0 to 9 inches: fine sandy loam H2 - 9 to 16 inches: fine sandy loam H3 - 16 to 23 inches: loam H4 - 23 to 26 inches: gravelly loam H5 - 26 to 60 inches: very gravelly fine sandy loam Properties and qualities Slope: 8 to 15 percent Percent of area covered with surface fragments: 2.0 percent Depth to restrictive feature: 20 to 31 inches to densic material Natural drainage class: Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately high (0.00 to 0.20 in/hr) Depth to water table: About 18 to 30 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Low (about 4.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: C Hydric soil rating: No Minor Components Paxton Percent of map unit: 5 percent Hydric soil rating: No Ridgebury Percent of map unit: 5 percent Landform: Depressions Hydric soil rating: Yes Woodbridge Percent of map unit: 5 percent Hydric soil rating: No 651—Udorthents, smoothed Map Unit Setting National map unit symbol: 9b23 Elevation: 0 to 3,000 feet Mean annual precipitation: 40 to 50 inches Mean annual air temperature: 45 to 52 degrees F Frost-free period: 120 to 200 days Custom Soil Resource Report 35 Farmland classification: Not prime farmland Map Unit Composition Udorthents and similar soils: 100 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Udorthents Setting Down-slope shape: Convex Across-slope shape: Convex Parent material: Loamy alluvium and/or sandy glaciofluvial deposits and/or loamy glaciolacustrine deposits and/or loamy marine deposits and/or loamy basal till and/or loamy lodgment till Properties and qualities Slope: 0 to 15 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: Medium Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6s Hydric soil rating: Unranked 727B—Enosburg fine sandy loam, 3 to 8 percent slopes Map Unit Setting National map unit symbol: 99zs Elevation: 90 to 1,000 feet Mean annual precipitation: 40 to 50 inches Mean annual air temperature: 45 to 52 degrees F Frost-free period: 140 to 240 days Farmland classification: Not prime farmland Map Unit Composition Enosburg and similar soils: 80 percent Minor components: 20 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Enosburg Setting Landform: Terraces Landform position (three-dimensional): Tread Down-slope shape: Linear Across-slope shape: Linear Custom Soil Resource Report 36 Parent material: Loose sandy glaciofluvial deposits over silty glaciolacustrine deposits Typical profile H1 - 0 to 9 inches: fine sandy loam H2 - 9 to 25 inches: loamy sand H3 - 25 to 60 inches: stratified loamy sand to silty clay Properties and qualities Slope: 3 to 8 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Poorly drained Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat): Moderately low to moderately high (0.06 to 0.60 in/hr) Depth to water table: About 0 to 12 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Moderate (about 8.2 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3w Hydrologic Soil Group: C/D Hydric soil rating: Yes Minor Components Maybid Percent of map unit: 10 percent Landform: Depressions Hydric soil rating: Yes Amostown Percent of map unit: 5 percent Hydric soil rating: No Raynham Percent of map unit: 5 percent Landform: Depressions Hydric soil rating: Yes Custom Soil Resource Report 37 References American Association of State Highway and Transportation Officials (AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes. ASTM Standard D2487-00. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep-water habitats of the United States. U.S. Fish and Wildlife Service FWS/OBS-79/31. Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. National Research Council. 1995. Wetlands: Characteristics and boundaries. Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U.S. Department of Agriculture Handbook 18. http://www.nrcs.usda.gov/wps/portal/ nrcs/detail/national/soils/?cid=nrcs142p2_054262 Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service, U.S. Department of Agriculture Handbook 436. http:// www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?cid=nrcs142p2_053577 Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. http:// www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?cid=nrcs142p2_053580 Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control, Wetlands Section. United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of Engineers wetlands delineation manual. Waterways Experiment Station Technical Report Y-87-1. United States Department of Agriculture, Natural Resources Conservation Service. National forestry manual. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/ home/?cid=nrcs142p2_053374 United States Department of Agriculture, Natural Resources Conservation Service. National range and pasture handbook. http://www.nrcs.usda.gov/wps/portal/nrcs/ detail/national/landuse/rangepasture/?cid=stelprdb1043084 38 United States Department of Agriculture, Natural Resources Conservation Service. National soil survey handbook, title 430-VI. http://www.nrcs.usda.gov/wps/portal/ nrcs/detail/soils/scientists/?cid=nrcs142p2_054242 United States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/? cid=nrcs142p2_053624 United States Department of Agriculture, Soil Conservation Service. 1961. Land capability classification. U.S. Department of Agriculture Handbook 210. http:// www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_052290.pdf Custom Soil Resource Report 39 Rocky Hill Bike Trail – Burts Bog Conservation Area Northampton, Massachusetts Stormwater Management Report The Berkshire Design Group, Inc. Appendix B – Stormwater Hydrology Calculations 1S Burts Bog Conservation Area Existing Conditions Routing Diagram for 18.149 Existing Conditions Prepared by Berkshire Design Group, Printed 4/2/2019 HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Subcat Reach Pond Link 18.149 Existing Conditions Printed 4/2/2019Prepared by Berkshire Design Group Page 2HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 15.360 36 Woods, Fair, HSG A (1S) 5.450 60 Woods, Fair, HSG B (1S) 43.290 73 Woods, Fair, HSG C (1S) 51.070 79 Woods, Fair, HSG D (1S) 115.170 70 TOTAL AREA 18.149 Existing Conditions Printed 4/2/2019Prepared by Berkshire Design Group Page 3HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 15.360 HSG A 1S 5.450 HSG B 1S 43.290 HSG C 1S 51.070 HSG D 1S 0.000 Other 115.170 TOTAL AREA Type III 24-hr 2-Year Rainfall=3.05"18.149 Existing Conditions Printed 4/2/2019Prepared by Berkshire Design Group Page 4HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=115.170 ac 0.00% Impervious Runoff Depth>0.66"Subcatchment 1S: Burts Bog Flow Length=3,400' Slope=0.0888 '/' Tc=37.9 min CN=70 Runoff=44.54 cfs 6.307 af Total Runoff Area = 115.170 ac Runoff Volume = 6.307 af Average Runoff Depth = 0.66" 100.00% Pervious = 115.170 ac 0.00% Impervious = 0.000 ac Type III 24-hr 2-Year Rainfall=3.05"18.149 Existing Conditions Printed 4/2/2019Prepared by Berkshire Design Group Page 5HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Burts Bog Conservation Area Existing Conditions Runoff = 44.54 cfs @ 12.60 hrs, Volume= 6.307 af, Depth> 0.66" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2-Year Rainfall=3.05" Area (ac) CN Description 15.360 36 Woods, Fair, HSG A 5.450 60 Woods, Fair, HSG B 43.290 73 Woods, Fair, HSG C 51.070 79 Woods, Fair, HSG D 115.170 70 Weighted Average 115.170 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 37.9 3,400 0.0888 1.50 Lag/CN Method, Contour Length= 445,554' Interval= 1' Type III 24-hr 10-Year Rainfall=4.50"18.149 Existing Conditions Printed 4/2/2019Prepared by Berkshire Design Group Page 6HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=115.170 ac 0.00% Impervious Runoff Depth>1.51"Subcatchment 1S: Burts Bog Flow Length=3,400' Slope=0.0888 '/' Tc=37.9 min CN=70 Runoff=110.41 cfs 14.536 af Total Runoff Area = 115.170 ac Runoff Volume = 14.536 af Average Runoff Depth = 1.51" 100.00% Pervious = 115.170 ac 0.00% Impervious = 0.000 ac Type III 24-hr 10-Year Rainfall=4.50"18.149 Existing Conditions Printed 4/2/2019Prepared by Berkshire Design Group Page 7HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Burts Bog Conservation Area Existing Conditions Runoff = 110.41 cfs @ 12.56 hrs, Volume= 14.536 af, Depth> 1.51" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Rainfall=4.50" Area (ac) CN Description 15.360 36 Woods, Fair, HSG A 5.450 60 Woods, Fair, HSG B 43.290 73 Woods, Fair, HSG C 51.070 79 Woods, Fair, HSG D 115.170 70 Weighted Average 115.170 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 37.9 3,400 0.0888 1.50 Lag/CN Method, Contour Length= 445,554' Interval= 1' Type III 24-hr 100-Year Rainfall=7.62"18.149 Existing Conditions Printed 4/2/2019Prepared by Berkshire Design Group Page 8HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=115.170 ac 0.00% Impervious Runoff Depth>3.81"Subcatchment 1S: Burts Bog Flow Length=3,400' Slope=0.0888 '/' Tc=37.9 min CN=70 Runoff=282.17 cfs 36.607 af Total Runoff Area = 115.170 ac Runoff Volume = 36.607 af Average Runoff Depth = 3.81" 100.00% Pervious = 115.170 ac 0.00% Impervious = 0.000 ac Type III 24-hr 100-Year Rainfall=7.62"18.149 Existing Conditions Printed 4/2/2019Prepared by Berkshire Design Group Page 9HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Burts Bog Conservation Area Existing Conditions Runoff = 282.17 cfs @ 12.53 hrs, Volume= 36.607 af, Depth> 3.81" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Rainfall=7.62" Area (ac) CN Description 15.360 36 Woods, Fair, HSG A 5.450 60 Woods, Fair, HSG B 43.290 73 Woods, Fair, HSG C 51.070 79 Woods, Fair, HSG D 115.170 70 Weighted Average 115.170 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 37.9 3,400 0.0888 1.50 Lag/CN Method, Contour Length= 445,554' Interval= 1' 1S Burts Bog Conservation Area Proposed Conditions Routing Diagram for 18.149 Proposed Cond Prepared by Berkshire Design Group, Printed 4/2/2019 HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Subcat Reach Pond Link 18.149 Proposed Cond Printed 4/2/2019Prepared by Berkshire Design Group Page 2HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 0.700 98 (1S) 15.130 36 Woods, Fair, HSG A (1S) 5.420 60 Woods, Fair, HSG B (1S) 42.940 73 Woods, Fair, HSG C (1S) 50.980 79 Woods, Fair, HSG D (1S) 115.170 70 TOTAL AREA 18.149 Proposed Cond Printed 4/2/2019Prepared by Berkshire Design Group Page 3HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 15.130 HSG A 1S 5.420 HSG B 1S 42.940 HSG C 1S 50.980 HSG D 1S 0.700 Other 1S 115.170 TOTAL AREA Type III 24-hr 2-Year Rainfall=3.05"18.149 Proposed Cond Printed 4/2/2019Prepared by Berkshire Design Group Page 4HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=115.170 ac 0.61% Impervious Runoff Depth>0.66"Subcatchment 1S: Burts Bog Flow Length=3,400' Slope=0.0888 '/' Tc=37.9 min CN=70 Runoff=44.54 cfs 6.307 af Total Runoff Area = 115.170 ac Runoff Volume = 6.307 af Average Runoff Depth = 0.66" 99.39% Pervious = 114.470 ac 0.61% Impervious = 0.700 ac Type III 24-hr 2-Year Rainfall=3.05"18.149 Proposed Cond Printed 4/2/2019Prepared by Berkshire Design Group Page 5HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Burts Bog Conservation Area Proposed Conditions Runoff = 44.54 cfs @ 12.60 hrs, Volume= 6.307 af, Depth> 0.66" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2-Year Rainfall=3.05" Area (ac) CN Description 15.130 36 Woods, Fair, HSG A 5.420 60 Woods, Fair, HSG B 42.940 73 Woods, Fair, HSG C 50.980 79 Woods, Fair, HSG D 0.700 98 115.170 70 Weighted Average 114.470 99.39% Pervious Area 0.700 0.61% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 37.9 3,400 0.0888 1.50 Lag/CN Method, Contour Length= 445,554' Interval= 1' Type III 24-hr 10-Year Rainfall=4.50"18.149 Proposed Cond Printed 4/2/2019Prepared by Berkshire Design Group Page 6HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=115.170 ac 0.61% Impervious Runoff Depth>1.51"Subcatchment 1S: Burts Bog Flow Length=3,400' Slope=0.0888 '/' Tc=37.9 min CN=70 Runoff=110.41 cfs 14.536 af Total Runoff Area = 115.170 ac Runoff Volume = 14.536 af Average Runoff Depth = 1.51" 99.39% Pervious = 114.470 ac 0.61% Impervious = 0.700 ac Type III 24-hr 10-Year Rainfall=4.50"18.149 Proposed Cond Printed 4/2/2019Prepared by Berkshire Design Group Page 7HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Burts Bog Conservation Area Proposed Conditions Runoff = 110.41 cfs @ 12.56 hrs, Volume= 14.536 af, Depth> 1.51" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Rainfall=4.50" Area (ac) CN Description 15.130 36 Woods, Fair, HSG A 5.420 60 Woods, Fair, HSG B 42.940 73 Woods, Fair, HSG C 50.980 79 Woods, Fair, HSG D 0.700 98 115.170 70 Weighted Average 114.470 99.39% Pervious Area 0.700 0.61% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 37.9 3,400 0.0888 1.50 Lag/CN Method, Contour Length= 445,554' Interval= 1' Type III 24-hr 100-Year Rainfall=7.62"18.149 Proposed Cond Printed 4/2/2019Prepared by Berkshire Design Group Page 8HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=115.170 ac 0.61% Impervious Runoff Depth>3.81"Subcatchment 1S: Burts Bog Flow Length=3,400' Slope=0.0888 '/' Tc=37.9 min CN=70 Runoff=282.17 cfs 36.607 af Total Runoff Area = 115.170 ac Runoff Volume = 36.607 af Average Runoff Depth = 3.81" 99.39% Pervious = 114.470 ac 0.61% Impervious = 0.700 ac Type III 24-hr 100-Year Rainfall=7.62"18.149 Proposed Cond Printed 4/2/2019Prepared by Berkshire Design Group Page 9HydroCAD® 10.00-24 s/n 10759 © 2018 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Burts Bog Conservation Area Proposed Conditions Runoff = 282.17 cfs @ 12.53 hrs, Volume= 36.607 af, Depth> 3.81" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Rainfall=7.62" Area (ac) CN Description 15.130 36 Woods, Fair, HSG A 5.420 60 Woods, Fair, HSG B 42.940 73 Woods, Fair, HSG C 50.980 79 Woods, Fair, HSG D 0.700 98 115.170 70 Weighted Average 114.470 99.39% Pervious Area 0.700 0.61% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 37.9 3,400 0.0888 1.50 Lag/CN Method, Contour Length= 445,554' Interval= 1' Rocky Hill Bike Trail – Burts Bog Conservation Area Northampton, Massachusetts Stormwater Management Report The Berkshire Design Group, Inc. Appendix C – Groundwater Recharge Calculations 4 Allen Place, Northampton, MA 01060 (413) 582-7000 bdg@berkshiredesign.com The Berkshire Design Group, Inc. April 2, 2019 Rocky Hill Bike Trail Stormwater Standard 3 – Recharge Calculations Proposed Impervious Area & Required Recharge Volume Table 1 shows the impervious area created from the proposed trail and the associated Required Recharge Volume. Required Recharge Volume is calculated by applying the following equation: Required Recharge Volume, = × Where, = Target Depth Factor, 0.6” for HSG A soils, 0.35” for B soils, 0.25” for C soils, and 0.10” for D soils = Impervious Area Table 1. Proposed Impervious Area and Recharge Volume Drainage Area ID (See Figure 6) Impervious Area (sq. ft.) Target Depth Factor (F) Required Recharge Volume (cu. ft.) 1 3,632 0.25 76 2 3,792 0.25 79 3 1,552 0.25 33 4 3,936 0.25 82 6 1,376 0.25 29 7 3,208 560 @0.25 2,648 @0.1 34 8 4,920 1,568@ 0.1 inch 3,352 @ .6 inch 181 9 5,432 0.6 inch 272 10 2,800 1,184 @ 0.35 inch 1,616 @ 0.6 inch 116 Total 30,648 902 Minimum Storage Volume This analysis utilizes the “Static Method” for determining required storage volume for infiltration features. Therefore, the minimum required storage volume is equal to the Required Recharge Volume, tabulated above. April 2, 2019 Rocky Hill Bike Trail Stormwater Standard 3 – Recharge Calculations Page 2 of 2 4 Allen Place, Northampton, MA 01060 (413) 582-7000 bdg@berkshiredesign.com Storage Volume Provided Table 2 summarizes the storage volume provided for the infiltration features in each drainage area. For earth infiltration basins, storage volume was calculated by average end area applied to contours, as shown on the Grading & Drainage Plan. Table 2. Proposed Increase in Impervious Area Drainage Area ID (See Figure 6) Required Recharge Volume (cu. ft.) Storage Volume Provided (cu. ft.) 1 76 LID credit 2 79 LID credit 3 33 LID credit 4 82 400 (C soils) 6 29 LID credit 7 34 LID credit 8 181 350 9 272 500 10 116 Not practicable Total 902 1050 The site wide provided infiltration storage volume of 1,050 cu. ft. exceeds the Required Recharge Volume of 902 cu. ft. In addition, the rain gardens provide excess water quality for the drainage area they serve. Drawdown Time The Massachusetts Stormwater Handbook requires that infiltration features empty in a time of less than 72 hours. DA 4 rain garden is located in fine sandy loam, underlain with gravelly loam: Rawls rate= 0.27 in/hour 0.27 ℎ× 72ℎ = 19 = 1.6 DA 4 rain garden is 1 ft. deep and therefore will draw down in less than 72 hours. DA 8 and 9 rain gardens are located in loamy sand: Rawls rate=2.41 in/hour 2.41 ℎ× 72ℎ = 174 = 14.5 DA 8 and 9 are designed one foot deep; therefore, they will draw down in less than 72 hours. Rocky Hill Bike Trail – Burts Bog Conservation Area Northampton, Massachusetts Stormwater Management Report The Berkshire Design Group, Inc. Appendix D – Water Quality Calculations 4 Allen Place, Northampton, MA 01060 (413) 582-7000 bdg@berkshiredesign.com The Berkshire Design Group, Inc. April 2, 2019 Rocky Hill Bike Trail Stormwater Standard 4 – Water Quality Volume Proposed Impervious Area & Required Water Quality Volume Table 1 shows the impervious area in each drainage area, and the associated Required Water Quality Volume. Required Volume is calculated by applying the following equation: Required Volume, = × Where, = Depth Factor, ½” for C and D soils, 1” for A and B soils = Impervious Area Table 1. Proposed Impervious Area Drainage Area ID (See Figure 5) Impervious Area (sq. ft.) Required Water Quality Volume (cu. ft.) WQv Provided (cu. ft.) 1 3,632 151 LID 2 3,792 158 LID 3 1552 65 LID 4 3,936 164 Rain garden 400 cu. ft. 6 1376 54 LID 7 3208 134 LID 8 4920 345 Rain garden 350 cu. ft. 9 5432 453 Rain gardens 500 cu. ft. 10 2800 234 Not practicable Total 30648 1,758 Storage volume was calculated by average end area applied to contours, as shown on the Grading & Drainage Plan. VINSTRUCTIONS:Version 1, Automated: Mar. 4, 20081. In BMP Column, click on Blue Cell to Activate Drop Down Menu2. Select BMP from Drop Down Menu3. After BMP is selected, TSS Removal and other Columns are automatically completed.Location: B C D E FTSS Removal Starting TSS Amount RemainingBMP1Rate1Load* Removed (C*D) Load (D-E)Rain Garden 0.901.00 0.90 0.100.000.10 0.00 0.100.000.10 0.00 0.100.000.10 0.00 0.100.000.10 0.00 0.10Total TSS Removal =90%Separate Form Needs to be Completed for Each Outlet or BMP TrainProject:Rocky Hill Bike TrailPrepared By:Berkshire Design Grp.*Equals remaining load from previous BMP (E)Date:4/2/2019which enters the BMPDrainage areas 4,8,9TSS Removal Calculation WorksheetNon-automated TSS Calculation Sheetmust be used if Proprietary BMP Proposed1. From MassDEP Stormwater Handbook Vol. 1Mass. Dept. of Environmental Protection VINSTRUCTIONS:Version 1, Automated: Mar. 4, 20081. In BMP Column, click on Blue Cell to Activate Drop Down Menu2. Select BMP from Drop Down Menu3. After BMP is selected, TSS Removal and other Columns are automatically completed.Location: B C D E FTSS Removal Starting TSS Amount RemainingBMP1Rate1Load* Removed (C*D) Load (D-E)Water Quality Swale - Wet 0.701.00 0.70 0.300.000.30 0.00 0.300.000.30 0.00 0.300.000.30 0.00 0.300.000.30 0.00 0.30Total TSS Removal =70%Separate Form Needs to be Completed for Each Outlet or BMP TrainProject:Rocky Hill Bike TrailPrepared By:Berkshire Design Grp.*Equals remaining load from previous BMP (E)Date:4/2/2019which enters the BMPTSS Removal Calculation WorksheetDrainage area 4Non-automated TSS Calculation Sheetmust be used if Proprietary BMP Proposed1. From MassDEP Stormwater Handbook Vol. 1Mass. Dept. of Environmental Protection Rocky Hill Bike Trail – Burts Bog Conservation Area Northampton, Massachusetts Stormwater Management Report The Berkshire Design Group, Inc. Appendix E – Runoff Conveyance 4 Allen Place, Northampton, MA 01060 (413) 582-7000 bdg@berkshiredesign.com The Berkshire Design Group, Inc. April 2, 2019 Rocky Hill Bike Trail Table 1 provides a summary of the runoff conveyances used along the trail corridor. Conveyances include 12” RCP culverts and drainage lenses. Drainage lenses are used throughout a section of the trail which is currently wet to allow free movement of runoff. Table 1. Runoff Conveyance Summary Drainage Area ID (See Figure 5) 25-Year Flow (cfs) Proposed pipe diameter or drainage lens Approx. Capacity (cfs) Flow vs capacity 1 1.37 12” RCP 4.9±  2 2.36 12” RCP 7.9±  3 2.68 12” RCP 4.8±  4 1.38 12” RCP 4.8±  5 2.44 12” RCP 4.6±  6 0.82 25’ drainage lens 1.1±  7 12.96 12” RCP 2-25’ drainage lenses 4.4± 2.2± See below 8 0.54 12” RCP 5.4±  9 0.30 12” RCP 5.0±  10 0.58 No conveyance needed -  Runoff within Drainage Area 7 generally flows northwest towards the trail and is directed under the trail via drainage lenses and a 12” culvert. Runoff which exceeds the capacity of the two drainage lenses will flow to the culvert. Any excess runoff over the capacity of the culvert will then follow existing flow patterns to the intermittent stream which flows offsite toward Stone Ridge Drive. Rocky Hill Bike Trail Flow through drainage lenses: Q=KiA K = permeability of drainage rock = 1 ft/sec I = hydraulic gradient = slope of bottom of drainage lens (2%) + depth of drainage lens stone (9”) = 0.02 +(9”/12”)/20’ = 0.02 + 0.0375 = 0.058 A = 9” depth over length of lens = 18.75 sq. ft. Q = 1 ft/sec x 0.058 x 18.75 sq. ft. = 1.1 cfs Culvert Report Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.Monday, Apr 8 2019 ROCKY HILL BIKE PATH - DRAINAGE AREA 1 CULVERT CROSSING Invert Elev Dn (ft) = 311.50 Pipe Length (ft) = 24.00 Slope (%) = 1.67 Invert Elev Up (ft) = 311.90 Rise (in) = 12.0 Shape = Circular Span (in) = 12.0 No. Barrels = 1 n-Value = 0.012 Culvert Type = Circular Concrete Culvert Entrance = Groove end projecting (C) Coeff. K,M,c,Y,k = 0.0045, 2, 0.0317, 0.69, 0.2 Embankment Top Elevation (ft) = 313.85 Top Width (ft) = 10.00 Crest Width (ft) = 100.00 Calculations Qmin (cfs) = 1.40 Qmax (cfs) = 6.00 Tailwater Elev (ft) = (dc+D)/2 Highlighted Qtotal (cfs) = 4.40 Qpipe (cfs) = 4.40 Qovertop (cfs) = 0.00 Veloc Dn (ft/s) = 5.75 Veloc Up (ft/s) = 6.02 HGL Dn (ft) = 312.44 HGL Up (ft) = 312.78 Hw Elev (ft) = 313.58 Hw/D (ft) = 1.68 Flow Regime = Inlet Control Rocky Hill Bike Trail – Burts Bog Conservation Area Northampton, Massachusetts Stormwater Management Report The Berkshire Design Group, Inc. Appendix F – Stormwater Management System – Operation & Maintenance Plan Rocky Hill Bike Trail – Burts Bog Conservation Area April 3, 2019 Northampton, Massachusetts Stormwater Management Report The Berkshire Design Group, Inc. Page 1 Stormwater Management System Operation & Maintenance Plan During Construction The Contractor shall be responsible for inspection and maintenance during construction. At all times, siltation fabric fencing, stakes and straw bales/wattles, sufficient to construct a sedimentation control barrier a minimum of 50 feet long, shall be stockpiled on the site in order to repair established barriers which may be damaged or breached. An inspection of all erosion control and stormwater management systems shall be conducted by the Contractor at least once a week and during all rain storms until the completion of construction. In case of any noted breach or failure, the Contractor shall immediately make appropriate repairs to any erosion control system and notify the engineer of any problems involving stormwater management systems. A rain storm shall be defined as any of the following: · A storm in which rain is predicted to last for twelve consecutive hours or more. · A storm for which a flash flood watch or warning is issued. · A single storm predicted to have a cumulative rainfall of greater than one-half inch. · A storm not meeting the previous three thresholds but which would mark a third consecutive day of measurable rainfall. The Contractor shall also inspect the erosion control and stormwater management systems at times of significant increase in surface water runoff due to rapid thawing when the risk of failure of erosion control measures is elevated. In such instances as remedial action is necessary, the Contractor shall repair any and all significant deficiencies in erosion control systems within two days. The Northampton Department of Public Works shall be notified of any significant failure of stormwater management systems or erosion and sediment control measures, and shall be notified of any release of pollutants to a water body (stream, brook, pond, etc.). The Contractor shall remove the sediment from behind the fence of the sedimentation control barrier when the accumulated sediment has reached one-half of the original installed height of the barrier. This project requires a NPDES General Permit for Stormwater Discharges from Construction Activities. Contractor and Owner are responsible for finalizing a Stormwater Pollution Prevention Plan (SWPPP) and filing for the NDPES permit prior to the start of construction. All clearing, grading, drainage, construction, and development shall be conducted in strict accordance with the SWPPP. Rocky Hill Bike Trail – Burts Bog Conservation Area April 3, 2019 Northampton, Massachusetts Stormwater Management Report The Berkshire Design Group, Inc. Page 2 Post-Construction Stormwater Management System Owner: City of Northampton (413) 587-4900 Party Responsible for Operation & Maintenance: City of Northampton Public Works (413) 587-1570 Inspection & Maintenance Schedule: 1) Spring Clean-Up At the beginning of the spring growing season, the site shall be inspected for bare spots and plant die-back. Landscaped areas shall be repaired and re-vegetated to promote infiltration of stormwater and to prevent erosion. 2) Storm Drain Outlet Protection/level spreader The integrity of riprap outlet armoring shall be inspected twice per year for signs of dislodged stones or erosion at the perimeter of the apron. Any damage should be repaired to return the apron to the condition shown in the contract documents. While some growth of herbaceous plants is expected, regular trimming is required to prevent growth from restricting the free flow of water across the apron. 3) Stone Diaphragm The diaphragm shall be inspected annually for sediment buildup and evidence of bypassing. If sediment is present at the surface, diaphragm shall be cleaned by removing and replacing stone and removing any sediment collected on the exposed filter fabric. Stone may be washed and re- used. Oil and sediments shall be removed and disposed of in accordance with local, state and federal guidelines and regulations. Inspections shall identify any damage or signs of erosion within and adjacent to diaphragm, which shall be repaired immediately. 3) Rain Garden The rain garden shall be inspected twice per year and cleaned annually, or more frequently if required. Failure of the system to drain (ponding 48 hours after the end of the storm) shall result in inspection and cleaning. Inspections shall identify any damage or signs of erosion within basin/swales, which shall be repaired immediately. Annually inspect rain garden landscaping. Prune foliage, remove and replace dead vegetation. 4) Water Quality Swales, Grass Swales Rocky Hill Bike Trail – Burts Bog Conservation Area April 3, 2019 Northampton, Massachusetts Stormwater Management Report The Berkshire Design Group, Inc. Page 3 The swales shall be inspected monthly until site vegetation is fully grown in, and twice per year thereafter. Inspect channel for adequate vegetated cover and for signs of erosion. Repair as necessary. Remove sediment and debris at least annually, and re-seed as necessary to ensure coverage and prevent erosion. 5) Level Spreaders The level spreader shall be inspected once per month and after any rainfall greater than one inch until site vegetation is fully grown in, and twice per year thereafter. Inspections shall identify any damage to the level spreader, low spots and signs of erosion at or near the level spreader, which shall be repaired immediately. Rocky Hill Bike Trail – Burts Bog Conservation Area Northampton, Massachusetts Stormwater Management Report The Berkshire Design Group, Inc. Appendix G – Illicit Discharge Compliance Statement The Berkshire Design Group, Inc. April 3, 2019 Rocky Hill Bike Trail – Burts Bog Conservation Area Illicit Discharge Statement The stormwater management system outlined in these plans is the system for conveying, treating, and discharging stormwater on site including stormwater best management practices. The control measures that have been included in the attached plans will be strictly followed to ensure that only storm water related discharges occur. By definition, an illicit discharge does not include discharges from the following activities or facilities: firefighting, water line flushing, landscape irrigation, uncontaminated ground water, potable water sources, foundation drains, air conditioning condensation, footing drains, individual resident car washing, flows from riparian habitats and wetlands, de-chlorinated water from swimming pools, water used for street washing and water used to clean residential buildings without detergents. Based on an in-person investigation of the site, Berkshire Design Group is not aware of any existing illicit discharges, and the proposed plans do not propose any. Illicit discharges, will be prohibited in the proposed project. Christopher Chamberland, P.E. for City of Northampton Rocky Hill Bike Trail – Burts Bog Conservation Area Northampton, Massachusetts Stormwater Management Report The Berkshire Design Group, Inc. Appendix H – Massachusetts DEP Stormwater Checklist