Revised Stormwater Management Report

PA-3 Existing and Proposed 2024-05-12 HydroCad - Proposed 11-12 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 6/13/2024 Page 4 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 27S: Basin 12 - Imp Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 1.00 0.04 0.00 2.00 0.08 0.01 3.00 0.13 0.03 4.00 0.18 0.06 5.00 0.24 0.09 6.00 0.29 0.14 7.00 0.36 0.20 8.00 0.45 0.27 9.00 0.55 0.36 10.00 0.68 0.49 11.00 0.89 0.69 12.00 1.65 1.43 13.00 2.55 2.32 14.00 2.76 2.53 15.00 2.89 2.66 16.00 2.99 2.76 17.00 3.08 2.85 18.00 3.15 2.91 19.00 3.20 2.97 20.00 3.26 3.03 21.00 3.31 3.08 22.00 3.36 3.12 23.00 3.40 3.17 24.00 3.44 3.21 25.00 3.44 3.21 26.00 3.44 3.21 27.00 3.44 3.21 28.00 3.44 3.21 29.00 3.44 3.21 30.00 3.44 3.21 31.00 3.44 3.21 32.00 3.44 3.21 33.00 3.44 3.21 34.00 3.44 3.21 35.00 3.44 3.21 36.00 3.44 3.21 37.00 3.44 3.21 38.00 3.44 3.21 39.00 3.44 3.21 40.00 3.44 3.21 41.00 3.44 3.21 42.00 3.44 3.21 43.00 3.44 3.21 44.00 3.44 3.21 45.00 3.44 3.21 46.00 3.44 3.21 47.00 3.44 3.21 48.00 3.44 3.21 49.00 3.44 3.21 50.00 3.44 3.21 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.02 0.12 0.02 0.01 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time Precip. Excess (hours) (inches) (inches) 51.00 3.44 3.21 52.00 3.44 3.21 53.00 3.44 3.21 54.00 3.44 3.21 55.00 3.44 3.21 56.00 3.44 3.21 57.00 3.44 3.21 58.00 3.44 3.21 59.00 3.44 3.21 60.00 3.44 3.21 61.00 3.44 3.21 62.00 3.44 3.21 63.00 3.44 3.21 64.00 3.44 3.21 65.00 3.44 3.21 66.00 3.44 3.21 67.00 3.44 3.21 68.00 3.44 3.21 69.00 3.44 3.21 70.00 3.44 3.21 71.00 3.44 3.21 72.00 3.44 3.21 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

PA-3 Existing and Proposed 2024-05-12 HydroCad - Proposed 11-12 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 6/13/2024 Page 5 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 29S: Basin 12 - Perv Runoff = 0.18 cfs @ 12.12 hrs, Volume= Routed to Pond 30 : Basin 12 0.012 af, Depth= 1.20" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA 24-hr D 2-Year Rainfall=3.44" Area (sf) 5,251 5,251 Tc (min) 3.8 Length (feet) 50 0.2 60 4.0 110 CN 74 Description >75% Grass cover, Good, HSG C 100.00% Pervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.1200 0.22 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" 0.1200 5.20 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps Total Subcatchment 29S: Basin 12 - Perv Hydrograph 0.2 Runoff 0.19 0.18 0.18 cfs 0.17 0.16 0.15 0.14 Flow (cfs) 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=5,251 sf Runoff Volume=0.012 af Runoff Depth=1.20" Flow Length=110' Tc=4.0 min CN=74 0.04 0.03 0.02 0.01 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours)

PA-3 Existing and Proposed 2024-05-12 HydroCad - Proposed 11-12 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 6/13/2024 Page 6 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 29S: Basin 12 - Perv Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 1.00 0.04 0.00 2.00 0.08 0.00 3.00 0.13 0.00 4.00 0.18 0.00 5.00 0.24 0.00 6.00 0.29 0.00 7.00 0.36 0.00 8.00 0.45 0.00 9.00 0.55 0.00 10.00 0.68 0.00 11.00 0.89 0.01 12.00 1.65 0.20 13.00 2.55 0.63 14.00 2.76 0.76 15.00 2.89 0.84 16.00 2.99 0.90 17.00 3.08 0.96 18.00 3.15 1.00 19.00 3.20 1.04 20.00 3.26 1.08 21.00 3.31 1.11 22.00 3.36 1.14 23.00 3.40 1.17 24.00 3.44 1.20 25.00 3.44 1.20 26.00 3.44 1.20 27.00 3.44 1.20 28.00 3.44 1.20 29.00 3.44 1.20 30.00 3.44 1.20 31.00 3.44 1.20 32.00 3.44 1.20 33.00 3.44 1.20 34.00 3.44 1.20 35.00 3.44 1.20 36.00 3.44 1.20 37.00 3.44 1.20 38.00 3.44 1.20 39.00 3.44 1.20 40.00 3.44 1.20 41.00 3.44 1.20 42.00 3.44 1.20 43.00 3.44 1.20 44.00 3.44 1.20 45.00 3.44 1.20 46.00 3.44 1.20 47.00 3.44 1.20 48.00 3.44 1.20 49.00 3.44 1.20 50.00 3.44 1.20 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.02 0.01 0.01 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time Precip. Excess (hours) (inches) (inches) 51.00 3.44 1.20 52.00 3.44 1.20 53.00 3.44 1.20 54.00 3.44 1.20 55.00 3.44 1.20 56.00 3.44 1.20 57.00 3.44 1.20 58.00 3.44 1.20 59.00 3.44 1.20 60.00 3.44 1.20 61.00 3.44 1.20 62.00 3.44 1.20 63.00 3.44 1.20 64.00 3.44 1.20 65.00 3.44 1.20 66.00 3.44 1.20 67.00 3.44 1.20 68.00 3.44 1.20 69.00 3.44 1.20 70.00 3.44 1.20 71.00 3.44 1.20 72.00 3.44 1.20 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

PA-3 Existing and Proposed 2024-05-12 HydroCad - Proposed 11-12 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 6/13/2024 Page 7 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Pond 30: Basin 12 Inflow Area = Inflow = Outflow = Discarded = 0.178 ac, 32.25% Impervious, Inflow Depth = 1.85" for 2-Year event 0.38 cfs @ 12.12 hrs, Volume= 0.027 af 0.08 cfs @ 11.88 hrs, Volume= 0.027 af, Atten= 78%, Lag= 0.0 min 0.08 cfs @ 11.88 hrs, Volume= 0.027 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 594.60' @ 12.39 hrs Surf.Area= 900 sf Storage= 215 cf Plug-Flow detention time= 14.7 min calculated for 0.027 af (100% of inflow) Center-of-Mass det. time= 14.7 min ( 819.5 - 804.8 ) Volume #1 Invert 594.00' Avail.Storage 1,724 cf #2 596.00' 151 cf 1,874 cf Elevation (feet) 594.00 599.00 Device #1 Surf.Area (sq-ft) 900 900 Routing Discarded Invert 594.00' Storage Description Custom Stage Data (Prismatic) Listed below (Recalc) 4,500 cf Overall - 191 cf Embedded = 4,309 cf x 40.0% Voids 8.00'D x 3.00'H Vertical Cone/Cylinder Inside #1 191 cf Overall - 6.0" Wall Thickness = 151 cf Total Available Storage Inc.Store (cubic-feet) 0 4,500 Cum.Store (cubic-feet) 0 4,500 Outlet Devices 4.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.08 cfs @ 11.88 hrs HW=594.05' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.08 cfs)

PA-3 Existing and Proposed 2024-05-12 HydroCad - Proposed 11-12 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 6/13/2024 Page 8 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 30: Basin 12 Flow (cfs) Hydrograph 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Discarded 0.38 cfs Inflow Area=0.178 ac Peak Elev=594.60' Storage=215 cf 0.08 cfs 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) Pond 30: Basin 12 Stage-Discharge 599 Discarded Elevation (feet) 598 597 596 595 594 Exfiltration 0 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 0.045 0.05 0.055 0.06 0.065 0.07 0.075 Discharge (cfs) 0.08

PA-3 Existing and Proposed 2024-05-12 HydroCad - Proposed 11-12 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 6/13/2024 Page 9 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 30: Basin 12 Time (hours) 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 22.00 24.00 26.00 28.00 30.00 32.00 34.00 36.00 38.00 40.00 42.00 44.00 46.00 48.00 50.00 52.00 54.00 56.00 58.00 60.00 62.00 64.00 66.00 68.00 70.00 72.00 Inflow (cfs) 0.00 0.00 0.00 0.00 0.00 0.01 0.20 0.02 0.01 0.01 0.01 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Storage (cubic-feet) 0 0 0 1 1 2 46 5 3 2 2 1 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 Elevation (feet) 594.00 594.00 594.00 594.00 594.00 594.01 594.13 594.01 594.01 594.01 594.00 594.00 594.00 594.00 594.00 594.00 594.00 594.00 594.00 594.00 594.00 594.00 594.00 594.00 594.00 594.00 594.00 594.00 594.00 594.00 594.00 594.00 594.00 594.00 594.00 594.00 594.00 Discarded (cfs) 0.00 0.00 0.00 0.00 0.00 0.01 0.08 0.02 0.01 0.01 0.01 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

PA-3 Existing and Proposed 2024-05-12 HydroCad - Proposed 11-12 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 6/13/2024 Page 10 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Stage-Discharge for Pond 30: Basin 12 Elevation (feet) 594.00 594.05 594.10 594.15 594.20 594.25 594.30 594.35 594.40 594.45 594.50 594.55 594.60 594.65 594.70 594.75 594.80 594.85 594.90 594.95 595.00 595.05 595.10 595.15 595.20 595.25 595.30 595.35 595.40 595.45 595.50 595.55 595.60 595.65 595.70 595.75 595.80 595.85 595.90 595.95 596.00 596.05 596.10 596.15 596.20 596.25 596.30 596.35 596.40 596.45 596.50 Discarded (cfs) 0.00 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 Elevation (feet) 596.55 596.60 596.65 596.70 596.75 596.80 596.85 596.90 596.95 597.00 597.05 597.10 597.15 597.20 597.25 597.30 597.35 597.40 597.45 597.50 597.55 597.60 597.65 597.70 597.75 597.80 597.85 597.90 597.95 598.00 598.05 598.10 598.15 598.20 598.25 598.30 598.35 598.40 598.45 598.50 598.55 598.60 598.65 598.70 598.75 598.80 598.85 598.90 598.95 599.00 Discarded (cfs) 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08

PA-3 Existing and Proposed 2024-05-12 HydroCad - Proposed 11-12 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 6/13/2024 Page 11 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 30: Basin 12 Elevation (feet) 594.00 594.05 594.10 594.15 594.20 594.25 594.30 594.35 594.40 594.45 594.50 594.55 594.60 594.65 594.70 594.75 594.80 594.85 594.90 594.95 595.00 595.05 595.10 595.15 595.20 595.25 595.30 595.35 595.40 595.45 595.50 595.55 595.60 595.65 595.70 595.75 595.80 595.85 595.90 595.95 596.00 596.05 596.10 596.15 596.20 596.25 596.30 596.35 596.40 596.45 596.50 Surface (sq-ft) 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 Storage (cubic-feet) 0 18 36 54 72 90 108 126 144 162 180 198 216 234 252 270 288 306 324 342 360 378 396 414 432 450 468 486 504 522 540 558 576 594 612 630 648 666 684 702 720 739 758 778 797 816 835 855 874 893 912 Elevation (feet) 596.55 596.60 596.65 596.70 596.75 596.80 596.85 596.90 596.95 597.00 597.05 597.10 597.15 597.20 597.25 597.30 597.35 597.40 597.45 597.50 597.55 597.60 597.65 597.70 597.75 597.80 597.85 597.90 597.95 598.00 598.05 598.10 598.15 598.20 598.25 598.30 598.35 598.40 598.45 598.50 598.55 598.60 598.65 598.70 598.75 598.80 598.85 598.90 598.95 599.00 Surface (sq-ft) 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 900 Storage (cubic-feet) 932 951 970 989 1,009 1,028 1,047 1,066 1,086 1,105 1,124 1,143 1,163 1,182 1,201 1,220 1,240 1,259 1,278 1,297 1,316 1,336 1,355 1,374 1,393 1,413 1,432 1,451 1,470 1,490 1,509 1,528 1,547 1,567 1,586 1,605 1,624 1,644 1,663 1,682 1,701 1,721 1,740 1,759 1,778 1,797 1,817 1,836 1,855 1,874

PA-3 Existing and Proposed 2024-05-12 HydroCad - Proposed 11-12 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 6/13/2024 Page 12 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 26S: Basin 12 pre-dev Runoff = 0.30 cfs @ 12.15 hrs, Volume= 0.023 af, Depth= 2.37" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA 24-hr D 10-Year Rainfall=5.22" Area (sf) 5,000 5,000 Tc (min) 7.6 Length (feet) 70 0.4 40 8.0 110 CN 72 Description Woods/grass comb., Good, HSG C 100.00% Pervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.1200 0.15 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.47" 0.1200 1.73 Shallow Concentrated Flow, Woodland Kv= 5.0 fps Total Subcatchment 26S: Basin 12 pre-dev Hydrograph Runoff 0.32 0.30 cfs 0.3 0.28 0.26 0.24 0.22 Flow (cfs) 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=5,000 sf Runoff Volume=0.023 af Runoff Depth=2.37" Flow Length=110' Slope=0.1200 '/' Tc=8.0 min CN=72 0.04 0.02 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours)

PA-3 Existing and Proposed 2024-05-12 HydroCad - Proposed 11-12 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 6/13/2024 Page 13 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 26S: Basin 12 pre-dev Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 1.00 0.06 0.00 2.00 0.13 0.00 3.00 0.20 0.00 4.00 0.27 0.00 5.00 0.36 0.00 6.00 0.45 0.00 7.00 0.55 0.00 8.00 0.68 0.00 9.00 0.83 0.00 10.00 1.03 0.02 11.00 1.36 0.08 12.00 2.50 0.53 13.00 3.86 1.36 14.00 4.19 1.59 15.00 4.39 1.74 16.00 4.54 1.85 17.00 4.67 1.95 18.00 4.77 2.03 19.00 4.86 2.09 20.00 4.95 2.16 21.00 5.02 2.22 22.00 5.09 2.27 23.00 5.16 2.32 24.00 5.22 2.37 25.00 5.22 2.37 26.00 5.22 2.37 27.00 5.22 2.37 28.00 5.22 2.37 29.00 5.22 2.37 30.00 5.22 2.37 31.00 5.22 2.37 32.00 5.22 2.37 33.00 5.22 2.37 34.00 5.22 2.37 35.00 5.22 2.37 36.00 5.22 2.37 37.00 5.22 2.37 38.00 5.22 2.37 39.00 5.22 2.37 40.00 5.22 2.37 41.00 5.22 2.37 42.00 5.22 2.37 43.00 5.22 2.37 44.00 5.22 2.37 45.00 5.22 2.37 46.00 5.22 2.37 47.00 5.22 2.37 48.00 5.22 2.37 49.00 5.22 2.37 50.00 5.22 2.37 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.13 0.04 0.02 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time Precip. Excess (hours) (inches) (inches) 51.00 5.22 2.37 52.00 5.22 2.37 53.00 5.22 2.37 54.00 5.22 2.37 55.00 5.22 2.37 56.00 5.22 2.37 57.00 5.22 2.37 58.00 5.22 2.37 59.00 5.22 2.37 60.00 5.22 2.37 61.00 5.22 2.37 62.00 5.22 2.37 63.00 5.22 2.37 64.00 5.22 2.37 65.00 5.22 2.37 66.00 5.22 2.37 67.00 5.22 2.37 68.00 5.22 2.37 69.00 5.22 2.37 70.00 5.22 2.37 71.00 5.22 2.37 72.00 5.22 2.37 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00