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Home My WebLink About20-37P Twin Manufacturing G:\jobs\2228\Docs\Applications-Working\IWACC\2228 - IWA-PZC Abutter Notice.doc P.O. BOX 1167 21 JEFFREY DRIVE SOUTH WINDSOR, CT 06074 PHONE: 860.291.8755 FAX: 860.291.8757 www.designprofessionalsinc.com CIVIL & TRAFFIC ENGINEERS / PLANNERS / SURVEYORS / GIS ANALYSTS / LANDSCAPE ARCHITECTS Serving Connecticu t, Massachusetts, & Rhode Island June 30, 2020 Re: Inland Wetlands Agency/Conservation Commission | Planning & Zoning Applications 273 Chapel Road, South Windsor, CT 06074 Dear Abutting Property Owner: In accordance with Section 7.3b of the “Town of South Windsor Inland Wetlands, Watercourses, and Conservation Regulations”, we are required to notify you that an application has been filed on the property abutting yours and is subject to a hearing by the Inland Wetlands Agency/Conservation Commission. The applic ation and plans are on file with the South Windsor Planning Department. As an abutting property owner, you are invited to the hearing to ask questions and/or give comments, however, you are not required to attend. You may also submit written comments rega rding the application prior to the hearing if you so desire. For further information regarding the specific date this will heard please contact Jeff Folger, Environmental Planner/Conservation Officer, Planning Department, 860-644-2511, ext. 229. Furthermore, in accordance with the Rules & Regulations of the South Windsor Planning & Zoning Commission, you are hereby notified that an application has been filed on the property abutting yours and is subject to a hearing by the Planning & Zoning Commission. The application and plans are on file with the South Windsor Planning Department. As an abutting property owner, you are invited to the hearing(s) to ask questions and/or give comments, however, you are not required to attend. You may also submit written comments regarding the application(s) prior to the meeting if you so desire. For further information regarding the specific date this application will be heard, please contact Michele Lipe, AICP, Town Planner, at the South Windsor Planning Department at 860-644-2511, ext. 252. If you have any questions regarding the specifics of the plans, please feel free to contact our office at 860-291-8755. Thank you. Sincerely, DESIGN PROFESSIONALS, INC. Benjamin P. Wheeler, PLA Director of Operations Cc: Town of South Windsor Client TOWN OF SOUTH WINDSOR, CONNECTICUT 273 CHAPEL ROAD | DIRECT ABUTTERS MAILING LIST Parcel ID Site Address Owner Name Mailing Address Mailing City Mailing State Mailing Zip 18000317 317 CHAPEL ROAD MARTO REALTY LLC 341 WEST ST HEBRON CT 06248- 0000 18000255 255 CHAPEL ROAD 255 CHAPEL ROAD LLC 54 SPINNERS RUN SOUTH WINDSOR CT 06074- 0000 18000245 245 CHAPEL ROAD CURRENT RESIDENT 8801 RIVER CROSSING SUITE 300 INDIANAPOLIS IN 46240- 0000 1800R011A 299 CHAPEL ROAD CURRENT RESIDENT 8801 RIVER CROSSING SUITE 300 INDIANAPOLIS IN 46240- 0000 18000282 282 CHAPEL ROAD CUBESMART LP PO BOX 320099 ALEXANDRIA VA 22320- 0000 18000334 334 CHAPEL ROAD CURRENT RESIDENT 658 ELLINGTON RD SOUTH WINDSOR CT 06074- 0000 18000310 310 CHAPEL ROAD JACQUES JEAN MARC 626 ELLINGTON RD SOUTH WINDSOR CT 06074- 0000 18000260 260 CHAPEL ROAD PTB OF SOUTH WINDSOR AND 275 EAST MAIN STREET ORANGE MA 01364- 0000 es i g n ro f e s s i o n a l s © ··· esign rofessionals· · · esign rofessionals 240 CHAPEL ROAD DABROWSKI HIPOLIT C & BOZENA 18000240 380 JOHN FITCH BOULEVARD HALLER EVE FAMILY LLC 47700380 360 ELLINGTON ROAD SCANNELL PROPERTIES #418 LLC (64%)30300360 282 CHAPEL ROAD CUBESMART LP 18000282 334 CHAPEL ROAD CURRENT RESIDENT 18000334 310 CHAPEL ROAD JACQUES JEAN MARC 18000310 339 CHAPEL ROAD MATHER FAMILY LIVING TRUST 18000339 260 CHAPEL ROAD PTB OF SOUTH WINDSOR AND 18000260 248 CHAPEL ROAD AINSWORTH REALTY LLC 18000248 336 CHAPEL ROAD TRI STATE RENTALS LLC 18000336 344 CHAPEL ROAD TRI STATE RENTALS LLC 18000344 350 CHAPEL ROAD RODRIQUE TIMOTHY TRUSTEE 18000350 253 CHAPEL ROAD R&J CLOUTIER LLC 18000253 317 CHAPEL ROAD MARTO REALTY LLC 18000317 371 CHAPEL ROAD MARTO REALTY LLC 18000371 255 CHAPEL ROAD 255 CHAPEL ROAD LLC 18000255 245 CHAPEL ROAD CURRENT RESIDENT 18000245 299 CHAPEL ROAD CURRENT RESIDENT 1800R011A Cut/Fill Summary Name EX vs PRop Totals Cut Factor 1.000 Fill Factor 1.000 2d Area 62408.06 Sq. Ft. 62408.06 Sq. Ft. Cut 588.11 Cu. Yd. 588.11 Cu. Yd. Fill 1241.63 Cu. Yd. 1241.63 Cu. Yd. Net 653.52 Cu. Yd.<Fill> 653.52 Cu. Yd.<Fill> es i g n ro f e s s i o n a l s © ··· es i g n ro f e s s i o n a l s © ··· es i g n ro f e s s i o n a l s © ··· es i g n ro f e s s i o n a l s © ··· · · · ’ · · · · ’ · es i g n ro f e s s i o n a l s © ··· STAKE TREES ONLY UPON THE APPROVAL OF THE LANDSCAPE ARCHITECT SEE STAKING DETAIL. WRAP TREE TRUNKS ONLY UPON THE APPROVAL OF THE LANDSCAPE ARCHITECT. SEE WRAPPING DETAIL. DO NOT HEAVILY PRUNE THE TREE AT PLANTING. PRUNE ONLY CROSSOVER LIMBS, CO-DOMINANT LEADERS, AND BROKEN OR DEAD BRANCHES. SOME INTERIOR TWIGS AND LATERAL BRANCHES MAY BE PRUNED; HOWEVER, DO NOT REMOVE THE TERMINAL BUDS OF BRANCHES THAT EXTEND TO THE EDGE OF THE CROWN. NOTE: FOR DIMENSIONS OF PLANTING AREAS, TYPES OF SOIL AMENDMENTS, OR SOIL REPLACEMENT, SEE "SOIL IMPROVEMENT DETAILS." NOTES: MARK THE NORTH SIDE OF THE TREE IN THE NURSERY, AND ROTATE TREE TO FACE NORTH AT THE SITE WHEN EVER POSSIBLE. SET TOP OF ROOT BALL FLUSH TO GRADE OR 25MM-50MM (1"-2") HIGHER IN SLOWLY DRAINING SOILS. MULCH RING, 1800MM (6') DIA. MIN. 2400MM (8') DIA. PREFERRED 50MM (2") MULCH. DO NOT PLACE MULCH IN CONTACT WITH TREE TRUNK. MAINTAIN THE MULCH WEED-FREE FOR A MIN. OF THREE YEARS AFTER PLANTING. EACH TREE MUST BE PLANTED SUCH THAT THE TRUNK FLARE IS VISIBLE AT THE TOP OF THE ROOT BALL. TREES WHERE THE TRUNK FLARE IS NOT VISIBLE SHALL BE REJECTED. DON'T COVER THE TOP OF THE ROOT BALL WITH SOIL. 100MM (4") HIGH EARTH SAUCER BEYOND EDGE OF ROOT BALL. REMOVE ALL TWINE, ROPE, WIRE AND BURLAP FROM TOP HALF OF ROOT BALL. REMOVE COMPLETELY IF SYNTHETIC IS USED. TAMP SOIL AROUND ROOT BALL BASE FIRMLY WITH FOOT PRESSURE SO THAT ROOT BALL DOESN'T SHIFT. IF PLANT IS SHIPPED WITH A WIRE BASKET AROUND ROOT BALL, CUT THE WIRE BASKET IN FOUR PLACES AND FOLD DOWN 200MM (8") INTO PLANTING HOLE. PLACE ROOT BALL ON UNEXCAVATED OR TAMPED SOIL. 1.NO MULCH WITHIN 3" OF TREE TRUNK 2.THIS DETAIL ASSUMES THAT THE PLANTING SPACE IS LARGER THAN 2400 MM (8 FT.) SQUARE, OPEN TO THE SKY, AND NOT COVERED BY ANY PAVING OR GRATING. LOAMY SOILS ARE DEFINED AS GRANULAR OR BLOCKY FRIABLE SOILS, A MIXTURE OF SAND, SILT AND CLAY THE SOIL MUST NOT BE SO COMPACTED AS TO IMPEDE ROOT GROWTH OR DRAINAGE. MASSIVE. THE SOIL MUST BE TESTED FOR TEXTURE, DRAINAGE CAPABILITY, PH, AND NUTRIENT VALUES PRIOR TO DETERMINING PLANT SELECTIONS AND ANY ADDITIONAL SOIL IMPROVEMENTS. THE LOAM CLASSIFICATIONS MAY PRESENT SPECIAL PLANTING PLANTING PROBLEMS NOT ANTICIPATED BY THIS DETAIL. BETWEEN 15 TO 27%: LOAM, SANDY LOAM AND SILT LOAM. NOTE THAT SOILS AT THE OUTER LIMITS OF INCLUDE THE FOLLOWING USDA TEXTURAL CLASSIFICATIONS AND HAVE A CLAY CONTENT OF LOAMY SOILS PARTICLES WITH A MINIMUM OF 1.5% BY DRY WEIGHT ORGANIC MATTER. THE SOIL STRUCTURE SHALL NOT BE PLATY OR NOTES: 2 X ROOT BALL DIAMETER NOTE: FOR DETAILED REQUIREMENTS RELATED TO THE PLANTING OF THE TREE IN THE IMPROVED SOIL, SEE "TREE PLANTING DETAIL."BACK FILL WITH EXISTING SOIL. IN SANDY LOAM SOILS, ADD 20% MAX. BY VOLUME COMPOSTED ORGANIC MATERIAL TO THE EXISTING SOIL.LOAMY SOIL TAMP SOIL AROUND ROOT BALL BASE FIRMLY WITH FOOT PRESSURE SO THAT ROOT BALL DOES NOT SHIFT. 1:1 SLOPE ON SIDES OF PLANTING HOLE. UNEXCAVATED OR COMPACTED MOUND UNDER THE ROOT BALL TO PREVENT SETTLEMENT. 1.FOR TREES PLANTED IN NON-RESTRICTED SOIL CONDITIONS. 2.THIS DETAIL ASSUMES THAT THE AREA OF LOAMY SOIL AVAILABLE TO EACH TREE IS A MINIMUM OF 45 SQ. M (500 SQ. FT) Not to Scale TREE PLANTING DETAIL1 Not to Scale SHRUB & GROUNDCOVER PLANTING DETAIL3 Not to Scale SOIL IMPROVEMENT DETAIL2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.1 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.1 0.1 0.1 0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.1 0.2 0.3 0.4 0.4 0.4 0.4 0.3 0.2 0.2 0.2 0.1 0.1 0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.2 0.2 0.6 0.8 0.7 0.7 0.7 0.6 0.4 0.3 0.3 0.2 0.2 0.1 0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.1 0.2 0.4 0.9 1.7 1.4 1.3 1.3 1.1 0.7 0.6 0.5 0.3 0.2 0.2 0.1 0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.2 0.4 0.7 1.5 3.1 2.4 2.1 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0.1 0.2 0.3 0.5 0.6 0.8 1.2 1.6 2.0 2.0 1.3 0.4 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.1 0.2 0.3 0.5 0.7 0.9 1.3 2.1 1.8 1.2 0.7 0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.1 0.2 0.4 0.6 0.8 1.2 1.5 1.9 1.7 1.0 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.2 0.3 0.5 0.8 1.1 1.6 2.1 2.1 1.6 0.9 0.1 0.1 0.1 0.0 0.0 0.0 0.1 0.1 0.2 0.3 0.5 0.7 1.1 1.5 1.8 1.5 1.2 0.5 0.0 0.0 0.0 0.0 0.0 0.1 0.2 0.2 0.3 0.5 0.6 0.9 1.3 1.5 1.3 0.2 0.0 0.0 0.0 0.0 0.0 0.1 0.2 0.2 0.4 0.5 0.7 0.9 0.8 0.1 0.0 0.0 0.0 0.0 0.0 0.1 0.2 0.3 0.4 0.5 0.3 0.0 0.0 0.0 0.0 0.0 0.2 0.2 0.1 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.25 0.25 0.25 0.25 0.25 0.250.25 0.25 0.25 0.250.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 11 1 1 1 1 es i g n ro f e s s i o n a l s © ··· es i g n ro f e s s i o n a l s © ··· “ ” · ·” ·“” · · · es i g n ro f e s s i o n a l s © ··· D es i g n ro f e s s i o n a l s © ···· · · · Stormwater Management Report Twin Manufacturing 273 Chapel Rd South Windsor, CT Prepared for: Twin Manufacturing Co. 273 Chapel Road South Windsor, CT 06074 Prepared by: Design Professionals, Inc. 21 Jeffrey Drive South Windsor, CT 06074 June 26, 2020 Table of Contents Section Page Introduction 1 Pre-Development Site Conditions 1 Post-Development Site Conditions 2 Analysis of Results 2 Water Quality 3 Conclusion 3 Appendices A Pre-Development Drainage HydroCAD Report B Post-Development Drainage HydroCAD Report C NRCS Soil Map & Data D Water Quality Calculations Water Quality Volume Calculations Depression Stage Storage Reports E Drainage Area Maps Existing Drainage Areas (Pre) Proposed Drainage Areas (Post) 1 Introduction Twin Manufacturing Co. is proposing a 9,420 + SF building expansion to their existing 37,155 + SF building. Twin Manufacturing’s 4.60 + acre parcel is located at 273 Chapel Road, South Windsor, Connecticut. The property is referenced on the Town of South Windsor Tax Assessors map as GIS#18000273. The proposed development will include the construction of the 9,420+ sf building expansion and associated site improvements to include, but not be limited to, new parking areas for standard vehicles and trucks, sidewalks, landscaping, lighting, and stormwater management BMP’s. Of the 4.60+ acre parcel, approximately 1.55+ acres are proposed to be disturbed for the construction of the industrial facility. There are no wetlands located on site. For more information, please refer to the plans entitled “Twin Manufacturing Site Plan Modification ~ 273 Chapel Road ~ South Windsor, CT ~ GIS#18000273” prepared by Design Professionals, Inc. and dated June 26th, 2020, as amended. Pre-Development Site Conditions The existing site currently operates as an industrial manufacturing facility with a mix of impervious areas including parking spaces, drive aisles, and the existing 37,155 SF building. Lawn and woodland areas along the outskirts of property boundaries make up the remaining land cover features on site. All runoff generated on site sheet flows across its southern, western, and eastern property lines. After leaving the site, accumulated runoff is collected in the storm water management system for the 360 Ellington Road Distribution Center. Please refer to the storm water management report titled “Stormwater Management Report ~ 360 Ellington Road Distribution Center ~ 360 Ellington Rd, 245 Chapel Rd & R008 John Fitch Boulevard, South Windsor, CT” for more information on that system. The 360 Ellington Road Distribution Center’s stormwater management system is comprised of a multi-infiltration basin network designed to infiltrate all stormwater on site for all storms up to and including the 100-year storm. Evaluation of the impact to this offsite stormwater management system due to Twin Manufacturing’s proposed building expansion, will be based on the final 100-storm elevation provided for the two infiltration basins considering the proposed site changes. The two infiltration basins for 360 Ellington Road will be the design points of this drainage evaluation, descriptions for each are provided below: • Design Point 1: IB-01- Surface Infiltration Basin located at the north-west corner of 360 Ellington Road. • Design Point 2: UGC-01 – Underground Infiltration System under the north-west truck parking/circulation area. Existing condition watershed delineations are identified in the Existing Conditions Drainage Map located in Appendix E. 2 Based on Natural Resources Conservation Service (NRCS) Hydrologic Soil Group (HSG) mapping, only type C soils are located on site. See Appendix C for The NRCS Soil Map & Data. To determine the change in elevation for the two 360 Ellington Road infiltration systems an evaluation was performed to quantify the peak rate of stormwater discharge to each (DP#1 & DP#2). The Natural Resources Conservation Service’s TR-55 Manual was followed in predicting the peak rates of runoff and volumes. HydroCAD computer modeling software was utilized. Existing elevations of the two infiltration basins were evaluated for the 100-year storm event. For more information, please refer to the enclosed Pre-Development Drainage HydroCAD Report located in Appendix A. Post-Development Site Conditions The subject project proposes the construction of a 9,420 SF + building expansion and associated site improvements. A water quality basin is also proposed to provide treatment of surface runoff from proposed pavement areas south of the building addition. The water quality basin will also provide some attenuation of onsite flows and was included in the proposed condition stormwater model. Observed test pit data from the 360 Ellington Road Stormwater Management Report indicated that this area has high permeable native soils. The water quality basin is expected to drain between storm events remaining in a predominantly dry state due to expected infiltration based on this information. Proposed condition elevations of the two infiltration basins were evaluated for the100-year storm event. For more information, please refer to the enclosed Post-Development Drainage HydroCAD Report located in Appendix B. Analysis of Results The pre-development and post-development conditions were analyzed using HydroCAD consistent with National Resource Conservation Service (NRCS) hydrology methods. The two infiltration basins identified as points of interest for assessing offsite effects were modeled using this software. The comparison of the existing vs proposed elevation achieved in each basin will determine if the two infiltration systems have the capacity to accept the proposed site changes. The following table contains the data generated from the HydroCAD: Reach (FT) 100 Year ELEV DP#1: IB-01 Surface Infiltration Basin Existing Elevation 55.01 Proposed Elevation 54.91 DP#2: UGC-01 Underground Infiltration System Existing Elevation 61.63 Proposed Elevation 61.62 3 As seen in the table above, the subject project will result in slight decreases to the existing elevations for two infiltration basins. Evaluation of the final outflow from 360 Ellington Road’s infiltration basin IB-01 yielded 0 CFS peak outflow rates for all storm events up to and including the 100-year storm. This shows conformance to the original 100% infiltration design intent for the distribution center at 360 Ellington Road. Water Quality Underground chamber system (UGC-01) was designed with an isolation row capable of treating 80% of the total suspended solids from the 360 Ellington Road site and the north/east portion of Twin Manufacturing. Please refer to the storm water management report titled “Stormwater Management Report ~ 360 Ellington Road Distribution Center ~ 360 Ellington Rd, 245 Chapel Rd & R008 John Fitch Boulevard South Windsor, CT” for more information on that system. The proposed water quality basin at the southern portion of Twin Manufacturing will also provide storage for more than 100% of the determined water quality volume for the new pavement area south of the proposed addition. Water quality volume calculations and stage storage volumes for this depression are included in Appendix D of this report. Conclusion The proposed stormwater management system as discussed herein and shown on the referenced plans is appropriate for the proposed development on the subject site, is consistent with Town and State requirements, and should not pose any detrimental impacts to the surrounding stormwater conditions. APPENDIX A Watershed Computations (Pre-Development Drainage HydroCAD Report) EXISTING CONDITIONS E1 IB-01 Surface Area E10 360 Ellington Road Roof (PARTIAL) E11 360 Ellington Road Pavement Area 3 E2 Twin Area B E3 Twin Area C E4 Twin Area A E5 360 Ellington Road Truck Entrance Area E6 Eastern Area E7 360 Ellington Road Pavement Area 1 E8 Admiral Area E9 360 Ellington Road Pavement Area 2 FB FB TO IB-01 & IB-02 IB-01 360 Ellington Road Infiltration Basin 1 IB-03 360 Ellington Road Infitration Basin 3 UGC-01 360 Ellignton Road Underground Detention System Routing Diagram for 2228 - Drainage Prepared by Design Professionals Inc. , Printed 6/29/2020 HydroCAD® 10.00-25 s/n 09320 © 2019 HydroCAD Software Solutions LLC Subcat Reach Pond Link Existing Conditions Type III 24-hr 100-yr Rainfall=7.77"2228 - Drainage Printed 6/29/2020Prepared by Design Professionals Inc. Page 2HydroCAD® 10.00-25 s/n 09320 © 2019 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=4.790 ac 0.00% Impervious Runoff Depth>4.37"Subcatchment E1: IB-01 Surface Area Tc=8.0 min CN=71 Runoff=22.96 cfs 1.746 af Runoff Area=4.834 ac 100.00% Impervious Runoff Depth>7.52"Subcatchment E10: 360 Ellington Road Tc=6.0 min CN=98 Runoff=36.87 cfs 3.031 af Runoff Area=6.214 ac 81.49% Impervious Runoff Depth>7.05"Subcatchment E11: 360 Ellington Road Tc=8.0 min CN=94 Runoff=43.47 cfs 3.648 af Runoff Area=0.704 ac 66.76% Impervious Runoff Depth>6.81"Subcatchment E2: Twin Area B Tc=7.0 min CN=92 Runoff=5.01 cfs 0.399 af Runoff Area=1.940 ac 43.40% Impervious Runoff Depth>6.57"Subcatchment E3: Twin Area C Tc=7.0 min CN=90 Runoff=13.54 cfs 1.063 af Runoff Area=1.901 ac 71.65% Impervious Runoff Depth>7.05"Subcatchment E4: Twin Area A Tc=8.0 min CN=94 Runoff=13.30 cfs 1.116 af Runoff Area=0.250 ac 100.00% Impervious Runoff Depth>7.52"Subcatchment E5: 360 Ellington Road Tc=8.0 min CN=98 Runoff=1.78 cfs 0.157 af Runoff Area=5.040 ac 17.32% Impervious Runoff Depth>5.75"Subcatchment E6: Eastern Area Tc=10.0 min CN=83 Runoff=29.05 cfs 2.414 af Runoff Area=0.693 ac 100.00% Impervious Runoff Depth>7.52"Subcatchment E7: 360 Ellington Road Tc=8.0 min CN=98 Runoff=4.94 cfs 0.434 af Runoff Area=8.673 ac 76.01% Impervious Runoff Depth>6.45"Subcatchment E8: Admiral Area Tc=10.0 min CN=89 Runoff=54.33 cfs 4.663 af Runoff Area=0.544 ac 100.00% Impervious Runoff Depth>7.52"Subcatchment E9: 360 Ellington Road Tc=8.0 min CN=98 Runoff=3.88 cfs 0.341 af Peak Elev=56.97' Storage=78,680 cf Inflow=83.32 cfs 7.020 afPond FB: FB TO IB-01 & IB-02 Primary=6.35 cfs 0.683 af Secondary=37.08 cfs 5.603 af Outflow=43.43 cfs 6.286 af Peak Elev=55.01' Storage=190,874 cf Inflow=143.29 cfs 14.498 afPond IB-01: 360 Ellington Road Discarded=31.71 cfs 14.497 af Primary=0.00 cfs 0.000 af Outflow=31.71 cfs 14.497 af Peak Elev=64.38' Storage=0.408 af Inflow=29.05 cfs 2.414 afPond IB-03: 360 Ellington Road Infitration Discarded=7.82 cfs 1.968 af Primary=5.79 cfs 0.446 af Outflow=13.45 cfs 2.414 af Peak Elev=61.63' Storage=0.606 af Inflow=78.43 cfs 6.816 afPond UGC-01: 360 Ellignton Road Discarded=1.05 cfs 0.833 af Primary=72.02 cfs 5.688 af Outflow=73.07 cfs 6.521 af Existing Conditions Type III 24-hr 100-yr Rainfall=7.77"2228 - Drainage Printed 6/29/2020Prepared by Design Professionals Inc. Page 3HydroCAD® 10.00-25 s/n 09320 © 2019 HydroCAD Software Solutions LLC Summary for Pond IB-01: 360 Ellington Road Infiltration Basin 1 Inflow Area = 23.991 ac, 46.19% Impervious, Inflow Depth > 7.25" for 100-yr event Inflow = 143.29 cfs @ 12.15 hrs, Volume= 14.498 af Outflow = 31.71 cfs @ 12.95 hrs, Volume= 14.497 af, Atten= 78%, Lag= 48.4 min Discarded = 31.71 cfs @ 12.95 hrs, Volume= 14.497 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 55.01' @ 12.95 hrs Surf.Area= 68,499 sf Storage= 190,874 cf Plug-Flow detention time= 41.4 min calculated for 14.497 af (100% of inflow) Center-of-Mass det. time= 41.4 min ( 837.1 - 795.7 ) Volume Invert Avail.Storage Storage Description #1 53.00' 274,073 cf Exfiltration Area (Conic) Listed below (Recalc) #2 53.00' 123,602 cf Non Exfiltration Area (Conic) Listed below (Recalc) -Impervious 397,675 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 53.00 62,779 0 0 62,779 54.00 65,554 64,161 64,161 65,696 55.00 68,459 67,001 131,163 68,742 56.00 71,412 69,930 201,093 71,840 57.00 74,560 72,980 274,073 75,131 Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 53.00 27,612 0 0 27,612 54.00 29,177 28,391 28,391 29,287 55.00 30,749 29,960 58,350 30,975 56.00 32,328 31,535 89,886 32,674 57.00 35,123 33,716 123,602 35,544 Device Routing Invert Outlet Devices #1 Discarded 53.00'20.000 in/hr Exfiltration over Surface area Phase-In= 0.01' #2 Primary 48.81'36.0" Round 36" HDPE L= 81.0' CPP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 48.81' / 48.00' S= 0.0100 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 7.07 sf #3 Device 2 56.60'70.0" W x 20.0" H Vert. "C-L" CB DOUBLE TYPE 2 X 2.00 C= 0.600 Discarded OutFlow Max=31.71 cfs @ 12.95 hrs HW=55.01' (Free Discharge) 1=Exfiltration (Exfiltration Controls 31.71 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=53.00' (Free Discharge) 2=36" HDPE (Passes 0.00 cfs of 55.52 cfs potential flow) 3="C-L" CB DOUBLE TYPE 2 ( Controls 0.00 cfs) Existing Conditions Type III 24-hr 100-yr Rainfall=7.77"2228 - Drainage Printed 6/29/2020Prepared by Design Professionals Inc. Page 4HydroCAD® 10.00-25 s/n 09320 © 2019 HydroCAD Software Solutions LLC Pond IB-01: 360 Ellington Road Infiltration Basin 1 Inflow Outflow Discarded Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210 Fl o w ( c f s ) 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 Inflow Area=23.991 ac Peak Elev=55.01' Storage=190,874 cf 143.29 cfs 31.71 cfs 31.71 cfs 0.00 cfs Existing Conditions Type III 24-hr 100-yr Rainfall=7.77"2228 - Drainage Printed 6/29/2020Prepared by Design Professionals Inc. Page 5HydroCAD® 10.00-25 s/n 09320 © 2019 HydroCAD Software Solutions LLC Summary for Pond UGC-01: 360 Ellignton Road Underground Detention System Inflow Area = 16.557 ac, 59.01% Impervious, Inflow Depth > 4.94" for 100-yr event Inflow = 78.43 cfs @ 12.13 hrs, Volume= 6.816 af Outflow = 73.07 cfs @ 12.17 hrs, Volume= 6.521 af, Atten= 7%, Lag= 2.6 min Discarded = 1.05 cfs @ 12.17 hrs, Volume= 0.833 af Primary = 72.02 cfs @ 12.17 hrs, Volume= 5.688 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 61.63' @ 12.17 hrs Surf.Area= 0.180 ac Storage= 0.606 af Plug-Flow detention time= 45.6 min calculated for 6.521 af (96% of inflow) Center-of-Mass det. time= 20.9 min ( 794.7 - 773.9 ) Volume Invert Avail.Storage Storage Description #1A 57.00' 0.287 af 37.58'W x 208.37'L x 6.75'H Field A 1.213 af Overall - 0.495 af Embedded = 0.718 af x 40.0% Voids #2A 57.75' 0.495 af ADS_StormTech MC-4500 +Cap x 200 Inside #1 Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.03'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap 200 Chambers in 4 Rows Cap Storage= +35.7 cf x 2 x 4 rows = 285.6 cf 0.783 af Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Discarded 57.00'20.000 in/hr Exfiltration over Wetted area above 57.00' Excluded Wetted area = 0.180 ac Phase-In= 0.01' #2 Primary 59.21'24.0" Round Culvert X 4.00 L= 150.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 59.21' / 58.09' S= 0.0075 '/' Cc= 0.900 n= 0.013, Flow Area= 3.14 sf Discarded OutFlow Max=1.05 cfs @ 12.17 hrs HW=61.63' (Free Discharge) 1=Exfiltration (Exfiltration Controls 1.05 cfs) Primary OutFlow Max=71.99 cfs @ 12.17 hrs HW=61.63' TW=53.84' (Dynamic Tailwater) 2=Culvert (Inlet Controls 71.99 cfs @ 5.73 fps) Existing Conditions Type III 24-hr 100-yr Rainfall=7.77"2228 - Drainage Printed 6/29/2020Prepared by Design Professionals Inc. Page 6HydroCAD® 10.00-25 s/n 09320 © 2019 HydroCAD Software Solutions LLC Pond UGC-01: 360 Ellignton Road Underground Detention System Inflow Outflow Discarded Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210 Fl o w ( c f s ) 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 Inflow Area=16.557 ac Peak Elev=61.63' Storage=0.606 af 78.43 cfs 73.07 cfs 1.05 cfs 72.02 cfs APPENDIX B Watershed Computations (Post-Development Drainage HydroCAD Report) PROPOSED CONDITIONS E1* IB-01 Surface Area E10* 360 Ellington Road Roof (PARTIAL) E11* 360 Ellington Road Pavement Area 3 E5* 360 Ellington Road Truck Entrance Area E6* Eastern Area E7* 360 Ellington Road Pavement Area 1 E8* Admiral Area E9* 360 Ellington Road Pavement Area 2 P1 Twin Area B P2 Twin Area C P3 Twin Area A P4 Twin Area D P5 Twin Area E FB* FB TO IB-01 & IB-02 IB-01* 360 Ellington Road Infiltration Basin 1 IB-03* 360 Ellington Road Infitration Basin 3 PP1 WQP1 UGC-01* 360 Ellignton Road Underground Detention System Routing Diagram for 2228 - Drainage Prepared by Design Professionals Inc. , Printed 6/29/2020 HydroCAD® 10.00-25 s/n 09320 © 2019 HydroCAD Software Solutions LLC Subcat Reach Pond Link Proposed Conditions Type III 24-hr 100-yr Rainfall=7.77"2228 - Drainage Printed 6/29/2020Prepared by Design Professionals Inc. Page 2HydroCAD® 10.00-25 s/n 09320 © 2019 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=4.790 ac 0.00% Impervious Runoff Depth>4.37"Subcatchment E1*: IB-01 Surface Area Tc=8.0 min CN=71 Runoff=22.96 cfs 1.746 af Runoff Area=4.834 ac 100.00% Impervious Runoff Depth>7.52"Subcatchment E10*: 360 Ellington Road Tc=6.0 min CN=98 Runoff=36.87 cfs 3.031 af Runoff Area=6.214 ac 81.49% Impervious Runoff Depth>7.05"Subcatchment E11*: 360 Ellington Road Tc=8.0 min CN=94 Runoff=43.47 cfs 3.648 af Runoff Area=0.250 ac 100.00% Impervious Runoff Depth>7.52"Subcatchment E5*: 360 Ellington Road Tc=8.0 min CN=98 Runoff=1.78 cfs 0.157 af Runoff Area=5.040 ac 17.32% Impervious Runoff Depth>5.75"Subcatchment E6*: Eastern Area Tc=10.0 min CN=83 Runoff=29.05 cfs 2.414 af Runoff Area=0.693 ac 100.00% Impervious Runoff Depth>7.52"Subcatchment E7*: 360 Ellington Road Tc=8.0 min CN=98 Runoff=4.94 cfs 0.434 af Runoff Area=8.673 ac 76.01% Impervious Runoff Depth>6.45"Subcatchment E8*: Admiral Area Tc=10.0 min CN=89 Runoff=54.33 cfs 4.663 af Runoff Area=0.544 ac 100.00% Impervious Runoff Depth>7.52"Subcatchment E9*: 360 Ellington Road Tc=8.0 min CN=98 Runoff=3.88 cfs 0.341 af Runoff Area=0.704 ac 68.75% Impervious Runoff Depth>6.93"Subcatchment P1: Twin Area B Tc=7.0 min CN=93 Runoff=5.05 cfs 0.406 af Runoff Area=1.624 ac 60.53% Impervious Runoff Depth>6.81"Subcatchment P2: Twin Area C Tc=7.0 min CN=92 Runoff=11.56 cfs 0.921 af Runoff Area=1.358 ac 85.35% Impervious Runoff Depth>7.17"Subcatchment P3: Twin Area A Tc=7.0 min CN=95 Runoff=9.88 cfs 0.811 af Runoff Area=0.543 ac 37.38% Impervious Runoff Depth>6.45"Subcatchment P4: Twin Area D Tc=8.0 min CN=89 Runoff=3.63 cfs 0.292 af Runoff Area=0.316 ac 16.46% Impervious Runoff Depth>6.10"Subcatchment P5: Twin Area E Tc=7.0 min CN=86 Runoff=2.10 cfs 0.161 af Peak Elev=56.97' Storage=78,680 cf Inflow=83.32 cfs 7.020 afPond FB*: FB TO IB-01 & IB-02 Primary=6.35 cfs 0.683 af Secondary=37.08 cfs 5.603 af Outflow=43.43 cfs 6.286 af Peak Elev=54.91' Storage=180,744 cf Inflow=133.60 cfs 14.045 afPond IB-01*: 360 Ellington Road Discarded=31.57 cfs 14.044 af Primary=0.00 cfs 0.000 af Outflow=31.57 cfs 14.044 af Peak Elev=64.38' Storage=0.408 af Inflow=29.05 cfs 2.414 afPond IB-03*: 360 Ellington Road Infitration Discarded=7.82 cfs 1.968 af Primary=5.79 cfs 0.446 af Outflow=13.45 cfs 2.414 af Proposed Conditions Type III 24-hr 100-yr Rainfall=7.77"2228 - Drainage Printed 6/29/2020Prepared by Design Professionals Inc. Page 3HydroCAD® 10.00-25 s/n 09320 © 2019 HydroCAD Software Solutions LLC Peak Elev=64.55' Storage=20,884 cf Inflow=11.56 cfs 0.921 afPond PP1: WQP1 Outflow=6.35 cfs 0.454 af Peak Elev=61.62' Storage=0.605 af Inflow=78.30 cfs 6.803 afPond UGC-01*: 360 Ellignton Road Discarded=1.05 cfs 0.832 af Primary=71.89 cfs 5.676 af Outflow=72.94 cfs 6.508 af Proposed Conditions Type III 24-hr 100-yr Rainfall=7.77"2228 - Drainage Printed 6/29/2020Prepared by Design Professionals Inc. Page 4HydroCAD® 10.00-25 s/n 09320 © 2019 HydroCAD Software Solutions LLC Summary for Pond IB-01*: 360 Ellington Road Infiltration Basin 1 Inflow Area = 23.991 ac, 47.06% Impervious, Inflow Depth > 7.03" for 100-yr event Inflow = 133.60 cfs @ 12.15 hrs, Volume= 14.045 af Outflow = 31.57 cfs @ 12.96 hrs, Volume= 14.044 af, Atten= 76%, Lag= 48.2 min Discarded = 31.57 cfs @ 12.96 hrs, Volume= 14.044 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 54.91' @ 12.96 hrs Surf.Area= 68,199 sf Storage= 180,744 cf Plug-Flow detention time= 39.3 min calculated for 14.038 af (100% of inflow) Center-of-Mass det. time= 39.2 min ( 839.3 - 800.1 ) Volume Invert Avail.Storage Storage Description #1 53.00' 274,073 cf Exfiltration Area (Conic) Listed below (Recalc) #2 53.00' 123,602 cf Non Exfiltration Area (Conic) Listed below (Recalc) -Impervious 397,675 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 53.00 62,779 0 0 62,779 54.00 65,554 64,161 64,161 65,696 55.00 68,459 67,001 131,163 68,742 56.00 71,412 69,930 201,093 71,840 57.00 74,560 72,980 274,073 75,131 Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 53.00 27,612 0 0 27,612 54.00 29,177 28,391 28,391 29,287 55.00 30,749 29,960 58,350 30,975 56.00 32,328 31,535 89,886 32,674 57.00 35,123 33,716 123,602 35,544 Device Routing Invert Outlet Devices #1 Discarded 53.00'20.000 in/hr Exfiltration over Surface area Phase-In= 0.01' #2 Primary 48.81'36.0" Round 36" HDPE L= 81.0' CPP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 48.81' / 48.00' S= 0.0100 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 7.07 sf #3 Device 2 56.60'70.0" W x 20.0" H Vert. "C-L" CB DOUBLE TYPE 2 X 2.00 C= 0.600 Discarded OutFlow Max=31.57 cfs @ 12.96 hrs HW=54.91' (Free Discharge) 1=Exfiltration (Exfiltration Controls 31.57 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=53.00' (Free Discharge) 2=36" HDPE (Passes 0.00 cfs of 55.52 cfs potential flow) 3="C-L" CB DOUBLE TYPE 2 ( Controls 0.00 cfs) Proposed Conditions Type III 24-hr 100-yr Rainfall=7.77"2228 - Drainage Printed 6/29/2020Prepared by Design Professionals Inc. Page 5HydroCAD® 10.00-25 s/n 09320 © 2019 HydroCAD Software Solutions LLC Pond IB-01*: 360 Ellington Road Infiltration Basin 1 Inflow Outflow Discarded Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210 Fl o w ( c f s ) 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 Inflow Area=23.991 ac Peak Elev=54.91' Storage=180,744 cf 133.60 cfs 31.57 cfs 31.57 cfs 0.00 cfs Proposed Conditions Type III 24-hr 100-yr Rainfall=7.77"2228 - Drainage Printed 6/29/2020Prepared by Design Professionals Inc. Page 6HydroCAD® 10.00-25 s/n 09320 © 2019 HydroCAD Software Solutions LLC Summary for Pond PP1: WQP1 Inflow Area = 1.624 ac, 60.53% Impervious, Inflow Depth > 6.81" for 100-yr event Inflow = 11.56 cfs @ 12.10 hrs, Volume= 0.921 af Outflow = 6.35 cfs @ 12.23 hrs, Volume= 0.454 af, Atten= 45%, Lag= 8.1 min Primary = 6.35 cfs @ 12.23 hrs, Volume= 0.454 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 64.55' @ 12.23 hrs Surf.Area= 10,807 sf Storage= 20,884 cf Plug-Flow detention time= 241.7 min calculated for 0.454 af (49% of inflow) Center-of-Mass det. time= 122.3 min ( 892.5 - 770.1 ) Volume Invert Avail.Storage Storage Description #1 62.00' 26,004 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 62.00 6,150 0 0 63.00 7,659 6,905 6,905 64.00 9,227 8,443 15,348 65.00 12,086 10,657 26,004 Device Routing Invert Outlet Devices #1 Primary 64.50'195.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 Primary OutFlow Max=6.34 cfs @ 12.23 hrs HW=64.55' TW=53.98' (Dynamic Tailwater) 1=Broad-Crested Rectangular Weir (Weir Controls 6.34 cfs @ 0.62 fps) Proposed Conditions Type III 24-hr 100-yr Rainfall=7.77"2228 - Drainage Printed 6/29/2020Prepared by Design Professionals Inc. Page 7HydroCAD® 10.00-25 s/n 09320 © 2019 HydroCAD Software Solutions LLC Pond PP1: WQP1 Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210 Fl o w ( c f s ) 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=1.624 ac Peak Elev=64.55' Storage=20,884 cf 11.56 cfs 6.35 cfs Proposed Conditions Type III 24-hr 100-yr Rainfall=7.77"2228 - Drainage Printed 6/29/2020Prepared by Design Professionals Inc. Page 8HydroCAD® 10.00-25 s/n 09320 © 2019 HydroCAD Software Solutions LLC Summary for Pond UGC-01*: 360 Ellignton Road Underground Detention System Inflow Area = 16.557 ac, 59.01% Impervious, Inflow Depth > 4.93" for 100-yr event Inflow = 78.30 cfs @ 12.12 hrs, Volume= 6.803 af Outflow = 72.94 cfs @ 12.17 hrs, Volume= 6.508 af, Atten= 7%, Lag= 2.6 min Discarded = 1.05 cfs @ 12.17 hrs, Volume= 0.832 af Primary = 71.89 cfs @ 12.17 hrs, Volume= 5.676 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 61.62' @ 12.17 hrs Surf.Area= 0.180 ac Storage= 0.605 af Plug-Flow detention time= 45.5 min calculated for 6.505 af (96% of inflow) Center-of-Mass det. time= 20.8 min ( 794.9 - 774.1 ) Volume Invert Avail.Storage Storage Description #1A 57.00' 0.287 af 37.58'W x 208.37'L x 6.75'H Field A 1.213 af Overall - 0.495 af Embedded = 0.718 af x 40.0% Voids #2A 57.75' 0.495 af ADS_StormTech MC-4500 +Cap x 200 Inside #1 Effective Size= 90.4"W x 60.0"H => 26.46 sf x 4.03'L = 106.5 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap 200 Chambers in 4 Rows Cap Storage= +35.7 cf x 2 x 4 rows = 285.6 cf 0.783 af Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Discarded 57.00'20.000 in/hr Exfiltration over Wetted area above 57.00' Excluded Wetted area = 0.180 ac Phase-In= 0.01' #2 Primary 59.21'24.0" Round Culvert X 4.00 L= 150.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 59.21' / 58.09' S= 0.0075 '/' Cc= 0.900 n= 0.013, Flow Area= 3.14 sf Discarded OutFlow Max=1.05 cfs @ 12.17 hrs HW=61.62' (Free Discharge) 1=Exfiltration (Exfiltration Controls 1.05 cfs) Primary OutFlow Max=71.84 cfs @ 12.17 hrs HW=61.62' TW=53.73' (Dynamic Tailwater) 2=Culvert (Inlet Controls 71.84 cfs @ 5.72 fps) Proposed Conditions Type III 24-hr 100-yr Rainfall=7.77"2228 - Drainage Printed 6/29/2020Prepared by Design Professionals Inc. Page 9HydroCAD® 10.00-25 s/n 09320 © 2019 HydroCAD Software Solutions LLC Pond UGC-01*: 360 Ellignton Road Underground Detention System Inflow Outflow Discarded Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210 Fl o w ( c f s ) 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 Inflow Area=16.557 ac Peak Elev=61.62' Storage=0.605 af 78.30 cfs 72.94 cfs 1.05 cfs 71.89 cfs APPENDIX C NRCS Soil Map & Data 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 State of ConnecticutNatural Resources Conservation Service February 11, 2020 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................................................................................................................9 Legend................................................................................................................10 Map Unit Legend................................................................................................11 Map Unit Descriptions.........................................................................................11 State of Connecticut........................................................................................13 12—Raypol silt loam...................................................................................13 108—Saco silt loam....................................................................................14 306—Udorthents-Urban land complex........................................................16 702B—Tisbury silt loam, 3 to 8 percent slopes...........................................18 704B—Enfield silt loam, 3 to 8 percent slopes............................................19 Soil Information for All Uses...............................................................................22 Soil Properties and Qualities..............................................................................22 Soil Qualities and Features.............................................................................22 Hydrologic Soil Group.................................................................................22 References............................................................................................................27 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 46 3 2 7 5 0 46 3 2 7 8 0 46 3 2 8 1 0 46 3 2 8 4 0 46 3 2 8 7 0 46 3 2 9 0 0 46 3 2 9 3 0 46 3 2 9 6 0 46 3 2 9 9 0 46 3 2 7 5 0 46 3 2 7 8 0 46 3 2 8 1 0 46 3 2 8 4 0 46 3 2 8 7 0 46 3 2 9 0 0 46 3 2 9 3 0 46 3 2 9 6 0 46 3 2 9 9 0 703120 703150 703180 703210 703240 703270 703300 703120 703150 703180 703210 703240 703270 703300 41° 49' 22'' N 72 ° 3 3 ' 1 5 ' ' W 41° 49' 22'' N 72 ° 3 3 ' 7 ' ' W 41° 49' 13'' N 72 ° 3 3 ' 1 5 ' ' W 41° 49' 13'' N 72 ° 3 3 ' 7 ' ' W N Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 18N WGS84 0 50 100 200 300 Feet 0 15 30 60 90 Meters Map Scale: 1:1,270 if printed on A portrait (8.5" x 11") sheet. Soil Map may not be valid at this scale. 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 1:12,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. 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: State of Connecticut Survey Area Data: Version 19, Sep 13, 2019 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jul 15, 2019—Aug 29, 2019 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 Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 12 Raypol silt loam 0.1 1.3% 108 Saco silt loam 0.1 0.7% 306 Udorthents-Urban land complex 5.7 67.7% 702B Tisbury silt loam, 3 to 8 percent slopes 0.5 5.9% 704B Enfield silt loam, 3 to 8 percent slopes 2.0 24.4% Totals for Area of Interest 8.4 100.0% Map Unit Descriptions 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 Custom Soil Resource Report 11 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 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 12 State of Connecticut 12—Raypol silt loam Map Unit Setting National map unit symbol: 9ljx Elevation: 0 to 1,200 feet Mean annual precipitation: 43 to 54 inches Mean annual air temperature: 45 to 55 degrees F Frost-free period: 140 to 185 days Farmland classification: Farmland of statewide importance Map Unit Composition Raypol and similar soils: 80 percent Minor components: 20 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Raypol Setting Landform: Depressions, drainageways Down-slope shape: Concave Across-slope shape: Concave Parent material: Coarse-loamy eolian deposits over sandy and gravelly glaciofluvial deposits derived from granite and/or schist and/or gneiss Typical profile Ap - 0 to 8 inches: silt loam Bg1 - 8 to 12 inches: very fine sandy loam Bg2 - 12 to 20 inches: silt loam Bw1 - 20 to 26 inches: silt loam Bw2 - 26 to 29 inches: very fine sandy loam 2C1 - 29 to 52 inches: stratified very gravelly coarse sand to loamy fine sand 2C2 - 52 to 65 inches: stratified very gravelly coarse sand to loamy fine sand Properties and qualities Slope: 0 to 3 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Poorly drained Runoff class: Low Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 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 7.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4w Hydrologic Soil Group: C/D Hydric soil rating: Yes Custom Soil Resource Report 13 Minor Components Haven Percent of map unit: 5 percent Landform: Terraces, outwash plains Down-slope shape: Convex Across-slope shape: Linear Hydric soil rating: No Enfield Percent of map unit: 5 percent Landform: Outwash plains, terraces Down-slope shape: Convex Across-slope shape: Linear Hydric soil rating: No Ninigret Percent of map unit: 3 percent Landform: Outwash plains, terraces Down-slope shape: Linear Across-slope shape: Concave Hydric soil rating: No Scarboro Percent of map unit: 2 percent Landform: Drainageways, depressions, terraces Down-slope shape: Concave Across-slope shape: Concave Hydric soil rating: Yes Tisbury Percent of map unit: 2 percent Landform: Outwash plains, terraces Down-slope shape: Concave Across-slope shape: Linear Hydric soil rating: No Walpole Percent of map unit: 2 percent Landform: Depressions on terraces, drainageways on terraces Down-slope shape: Concave Across-slope shape: Concave Hydric soil rating: Yes Unnamed, loamy substratum Percent of map unit: 1 percent 108—Saco silt loam Map Unit Setting National map unit symbol: 9ljv Custom Soil Resource Report 14 Elevation: 0 to 1,200 feet Mean annual precipitation: 43 to 54 inches Mean annual air temperature: 45 to 55 degrees F Frost-free period: 140 to 185 days Farmland classification: Not prime farmland Map Unit Composition Saco and similar soils: 80 percent Minor components: 20 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Saco Setting Landform: Flood plains Down-slope shape: Concave Across-slope shape: Concave Parent material: Coarse-silty alluvium Typical profile A - 0 to 12 inches: silt loam Cg1 - 12 to 32 inches: silt loam Cg2 - 32 to 48 inches: silt loam 2Cg3 - 48 to 60 inches: stratified very gravelly coarse sand to loamy fine sand Properties and qualities Slope: 0 to 2 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Very poorly drained Runoff class: Low Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: About 0 to 6 inches Frequency of flooding: Frequent Frequency of ponding: Frequent Available water storage in profile: High (about 10.1 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6w Hydrologic Soil Group: B/D Hydric soil rating: Yes Minor Components Lim Percent of map unit: 5 percent Landform: Flood plains Down-slope shape: Concave Across-slope shape: Concave Hydric soil rating: Yes Limerick Percent of map unit: 5 percent Landform: Flood plains Down-slope shape: Concave Across-slope shape: Concave Custom Soil Resource Report 15 Hydric soil rating: Yes Winooski Percent of map unit: 3 percent Landform: Flood plains Down-slope shape: Linear Across-slope shape: Linear Hydric soil rating: No Rippowam Percent of map unit: 3 percent Landform: Flood plains Down-slope shape: Linear Across-slope shape: Concave Hydric soil rating: Yes Hadley Percent of map unit: 2 percent Landform: Flood plains Down-slope shape: Linear Across-slope shape: Linear Hydric soil rating: No Bash Percent of map unit: 2 percent Landform: Flood plains Down-slope shape: Concave Across-slope shape: Concave Hydric soil rating: Yes 306—Udorthents-Urban land complex Map Unit Setting National map unit symbol: 9lmg Elevation: 0 to 2,000 feet Mean annual precipitation: 43 to 56 inches Mean annual air temperature: 45 to 55 degrees F Frost-free period: 120 to 185 days Farmland classification: Not prime farmland Map Unit Composition Udorthents and similar soils: 50 percent Urban land: 35 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Udorthents Setting Down-slope shape: Convex Across-slope shape: Linear Custom Soil Resource Report 16 Parent material: Drift Typical profile A - 0 to 5 inches: loam C1 - 5 to 21 inches: gravelly loam C2 - 21 to 80 inches: very gravelly sandy loam Properties and qualities Slope: 0 to 25 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00 to 1.98 in/hr) Depth to water table: About 54 to 72 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Moderate (about 6.8 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3e Hydrologic Soil Group: B Hydric soil rating: No Description of Urban Land Typical profile H - 0 to 6 inches: material Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 8 Hydrologic Soil Group: D Hydric soil rating: Unranked Minor Components Unnamed, undisturbed soils Percent of map unit: 8 percent Hydric soil rating: No Udorthents, wet substratum Percent of map unit: 5 percent Down-slope shape: Convex Across-slope shape: Linear Hydric soil rating: No Rock outcrop Percent of map unit: 2 percent Hydric soil rating: No Custom Soil Resource Report 17 702B—Tisbury silt loam, 3 to 8 percent slopes Map Unit Setting National map unit symbol: 2y07h Elevation: 0 to 1,260 feet Mean annual precipitation: 43 to 54 inches Mean annual air temperature: 45 to 55 degrees F Frost-free period: 140 to 185 days Farmland classification: All areas are prime farmland Map Unit Composition Tisbury and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Tisbury Setting Landform: Valley trains, outwash terraces, outwash plains, deltas Landform position (three-dimensional): Tread Down-slope shape: Concave Across-slope shape: Concave Parent material: Coarse-silty eolian deposits over sandy and gravelly glaciofluvial deposits derived from granite, schist, and/or gneiss Typical profile Ap - 0 to 8 inches: silt loam Bw1 - 8 to 18 inches: silt loam Bw2 - 18 to 26 inches: silt loam 2C - 26 to 65 inches: extremely gravelly sand Properties and qualities Slope: 3 to 8 percent Depth to restrictive feature: 24 to 36 inches to strongly contrasting textural stratification Natural drainage class: Moderately well drained Runoff class: Low 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 18 to 30 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 4.3 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2e Hydrologic Soil Group: C Custom Soil Resource Report 18 Hydric soil rating: No Minor Components Agawam Percent of map unit: 5 percent Landform: Outwash plains, kame terraces, outwash terraces, kames, moraines Landform position (two-dimensional): Backslope, shoulder, footslope, summit, toeslope Landform position (three-dimensional): Side slope, crest, head slope, nose slope, tread Down-slope shape: Convex Across-slope shape: Convex Hydric soil rating: No Merrimac Percent of map unit: 5 percent Landform: Kames, outwash plains, moraines, eskers, outwash terraces Landform position (two-dimensional): Backslope, footslope, shoulder, summit, toeslope Landform position (three-dimensional): Side slope, crest, head slope, nose slope, tread Down-slope shape: Convex Across-slope shape: Convex Hydric soil rating: No Ninigret Percent of map unit: 3 percent Landform: Outwash plains, kame terraces, outwash terraces, kames, moraines Landform position (two-dimensional): Footslope, backslope, toeslope Landform position (three-dimensional): Base slope, tread Down-slope shape: Convex, linear Across-slope shape: Convex, concave Hydric soil rating: No Raypol Percent of map unit: 2 percent Landform: Drainageways, depressions Down-slope shape: Concave Across-slope shape: Concave Hydric soil rating: Yes 704B—Enfield silt loam, 3 to 8 percent slopes Map Unit Setting National map unit symbol: 2y07q Elevation: 0 to 1,200 feet Mean annual precipitation: 43 to 54 inches Mean annual air temperature: 45 to 55 degrees F Frost-free period: 140 to 185 days Farmland classification: All areas are prime farmland Custom Soil Resource Report 19 Map Unit Composition Enfield and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Enfield Setting Landform: Outwash terraces, outwash plains Landform position (three-dimensional): Tread Down-slope shape: Convex Across-slope shape: Linear Parent material: Coarse-silty eolian deposits over sandy and gravelly glaciofluvial deposits derived from granite, schist, and/or gneiss Typical profile Ap - 0 to 7 inches: silt loam Bw1 - 7 to 15 inches: silt loam Bw2 - 15 to 25 inches: silt loam 2C - 25 to 60 inches: stratified very gravelly coarse sand to loamy sand Properties and qualities Slope: 3 to 8 percent Depth to restrictive feature: 16 to 39 inches to strongly contrasting textural stratification Natural drainage class: Well drained Runoff class: Low Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Low (about 4.3 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2e Hydrologic Soil Group: B Hydric soil rating: No Minor Components Haven Percent of map unit: 5 percent Landform: Outwash terraces, outwash plains Landform position (three-dimensional): Tread Down-slope shape: Convex Across-slope shape: Linear Hydric soil rating: No Tisbury Percent of map unit: 5 percent Landform: Valley trains, outwash terraces, outwash plains, deltas Landform position (three-dimensional): Tread Down-slope shape: Concave Across-slope shape: Concave Custom Soil Resource Report 20 Hydric soil rating: No Agawam Percent of map unit: 3 percent Landform: Outwash plains, kame terraces, outwash terraces, kames, moraines Landform position (two-dimensional): Backslope, shoulder, footslope, summit, toeslope Landform position (three-dimensional): Side slope, crest, head slope, nose slope, tread Down-slope shape: Convex Across-slope shape: Convex Hydric soil rating: No Raypol Percent of map unit: 2 percent Landform: Drainageways, depressions Down-slope shape: Concave Across-slope shape: Concave Hydric soil rating: Yes Custom Soil Resource Report 21 Soil Information for All Uses Soil Properties and Qualities The Soil Properties and Qualities section includes various soil properties and qualities displayed as thematic maps with a summary table for the soil map units in the selected area of interest. A single value or rating for each map unit is generated by aggregating the interpretive ratings of individual map unit components. This aggregation process is defined for each property or quality. Soil Qualities and Features Soil qualities are behavior and performance attributes that are not directly measured, but are inferred from observations of dynamic conditions and from soil properties. Example soil qualities include natural drainage, and frost action. Soil features are attributes that are not directly part of the soil. Example soil features include slope and depth to restrictive layer. These features can greatly impact the use and management of the soil. Hydrologic Soil Group Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. 22 Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Custom Soil Resource Report 23 24 Custom Soil Resource Report Map—Hydrologic Soil Group 46 3 2 7 5 0 46 3 2 7 8 0 46 3 2 8 1 0 46 3 2 8 4 0 46 3 2 8 7 0 46 3 2 9 0 0 46 3 2 9 3 0 46 3 2 9 6 0 46 3 2 9 9 0 46 3 2 7 5 0 46 3 2 7 8 0 46 3 2 8 1 0 46 3 2 8 4 0 46 3 2 8 7 0 46 3 2 9 0 0 46 3 2 9 3 0 46 3 2 9 6 0 46 3 2 9 9 0 703120 703150 703180 703210 703240 703270 703300 703120 703150 703180 703210 703240 703270 703300 41° 49' 22'' N 72 ° 3 3 ' 1 5 ' ' W 41° 49' 22'' N 72 ° 3 3 ' 7 ' ' W 41° 49' 13'' N 72 ° 3 3 ' 1 5 ' ' W 41° 49' 13'' N 72 ° 3 3 ' 7 ' ' W N Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 18N WGS84 0 50 100 200 300 Feet 0 15 30 60 90 Meters Map Scale: 1:1,270 if printed on A portrait (8.5" x 11") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons A A/D B B/D C C/D D Not rated or not available Soil Rating Lines A A/D B B/D C C/D D Not rated or not available Soil Rating Points A A/D B B/D C C/D D Not rated or not available 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 1:12,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. 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: State of Connecticut Survey Area Data: Version 19, Sep 13, 2019 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jul 15, 2019—Aug 29, 2019 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 25 Table—Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 12 Raypol silt loam C/D 0.1 1.3% 108 Saco silt loam B/D 0.1 0.7% 306 Udorthents-Urban land complex B 5.7 67.7% 702B Tisbury silt loam, 3 to 8 percent slopes C 0.5 5.9% 704B Enfield silt loam, 3 to 8 percent slopes B 2.0 24.4% Totals for Area of Interest 8.4 100.0% Rating Options—Hydrologic Soil Group Aggregation Method: Dominant Condition Component Percent Cutoff: None Specified Tie-break Rule: Higher Custom Soil Resource Report 26 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 27 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 28 APPENDIX D Water Quality Calculations 273 Chapel Road – DPI Project No.:2228 June 26, 2020 Water Quality Volume Calculations Per 2004 Connecticut Stormwater Quality Manual, Section 7.4.1: Areas for Calculation: On Site to Water Quality Basin PP1 (P2) P2 Impervious 0.983 Pervious 0.641 Total Area 1.624 %Impervious 60.53% Water Quality Volume (WQV) = (1”)(R)(A)/12, where: R = unitless volumetric runoff coefficient = 0.05 + 0.009(I), where: I = percent impervious cover of drainage area = 60.53% R = 0.05 + 0.009(I) R = 0.05 + 0.009(60.53) R = 0.595 A = drainage area in acres = 1.624 acres WQV = (1”)(R)(A acres)/12 inches per foot WQV = (1”)(0.595)(1.624 acres)/12 inches per foot WQV = 0.08 acre-feet required = 3,498 cft Proposed BMP The proposed forebay is proposed to provide 32,691 cft (below orifice at Elev. 56.00). The forebay will provide storage for 228.4% of the determined water quality volume draining to the basin. 273 Chapel Road – DPI Project No.:2228 June 17, 2020 Water Quality Volume Calculations Per 2004 Connecticut Stormwater Quality Manual, Section 7.4.1: Areas for Calculation: On Site to Forebay (P2) P2 Impervious 0.983 Pervious 0.641 Total Area 1.624 %Impervious 60.53% Water Quality Volume (WQV) = (1”)(R)(A)/12, where: R = unitless volumetric runoff coefficient = 0.05 + 0.009(I), where: I = percent impervious cover of drainage area = 60.53% R = 0.05 + 0.009(I) R = 0.05 + 0.009(60.53) R = 0.614 A = drainage area in acres = 0.534 acres WQV = (1”)(R)(A acres)/12 inches per foot WQV = (1”)(0.595)(1.624 acres)/12 inches per foot WQV = 0.03 acre-feet required = 3,498 cft Proposed BMP The proposed forebay is proposed to provide 32,691 cft (below orifice at Elev. 56.00). The forebay will provide storage for 228.4% of the determined water quality volume draining to the basin. Type III 24-hr 10-yr Rainfall=4.90"2228 - Drainage Printed 6/30/2020Prepared by Design Professionals Inc. HydroCAD® 10.00-25 s/n 09320 © 2019 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond PP1: WQP1 Elevation (feet) Surface (sq-ft) Storage (cubic-feet) 62.00 6,150 0 62.05 6,225 309 62.10 6,301 623 62.15 6,376 939 62.20 6,452 1,260 62.25 6,527 1,585 62.30 6,603 1,913 62.35 6,678 2,245 62.40 6,754 2,581 62.45 6,829 2,920 62.50 6,905 3,264 62.55 6,980 3,611 62.60 7,055 3,962 62.65 7,131 4,316 62.70 7,206 4,675 62.75 7,282 5,037 62.80 7,357 5,403 62.85 7,433 5,773 62.90 7,508 6,146 62.95 7,584 6,523 63.00 7,659 6,905 63.05 7,737 7,289 63.10 7,816 7,678 63.15 7,894 8,071 63.20 7,973 8,468 63.25 8,051 8,868 63.30 8,129 9,273 63.35 8,208 9,681 63.40 8,286 10,094 63.45 8,365 10,510 63.50 8,443 10,930 63.55 8,521 11,354 63.60 8,600 11,782 63.65 8,678 12,214 63.70 8,757 12,650 63.75 8,835 13,090 63.80 8,913 13,533 63.85 8,992 13,981 63.90 9,070 14,433 63.95 9,149 14,888 64.00 9,227 15,348 64.05 9,370 15,812 64.10 9,513 16,284 64.15 9,656 16,764 64.20 9,799 17,250 64.25 9,942 17,744 64.30 10,085 18,244 64.35 10,228 18,752 64.40 10,371 19,267 64.45 10,514 19,789 64.50 10,657 20,318 64.55 10,799 20,855 Elevation (feet) Surface (sq-ft) Storage (cubic-feet) 64.60 10,942 21,398 64.65 11,085 21,949 64.70 11,228 22,507 64.75 11,371 23,072 64.80 11,514 23,644 64.85 11,657 24,223 64.90 11,800 24,810 64.95 11,943 25,403 65.00 12,086 26,004 APPENDIX E Drainage Area Maps es i g n ro f e s s i o n a l s © ··· es i g n ro f e s s i o n a l s © ···