Revised Stormwater Management Report

15 0.11 0.10 0.08 0.07 0.06 0.06 0.06 0.05 0.05 0.05 0.04 0.04 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) 40.80 5.22 2.63 41.60 5.22 2.63 42.40 5.22 2.63 43.20 5.22 2.63 44.00 5.22 2.63 44.80 5.22 2.63 45.60 5.22 2.63 46.40 5.22 2.63 47.20 5.22 2.63 48.00 5.22 2.63 48.80 5.22 2.63 49.60 5.22 2.63 50.40 5.22 2.63 51.20 5.22 2.63 52.00 5.22 2.63 52.80 5.22 2.63 53.60 5.22 2.63 54.40 5.22 2.63 55.20 5.22 2.63 56.00 5.22 2.63 56.80 5.22 2.63 57.60 5.22 2.63 58.40 5.22 2.63 59.20 5.22 2.63 60.00 5.22 2.63 60.80 5.22 2.63 61.60 5.22 2.63 62.40 5.22 2.63 63.20 5.22 2.63 64.00 5.22 2.63 64.80 5.22 2.63 65.60 5.22 2.63 66.40 5.22 2.63 67.20 5.22 2.63 68.00 5.22 2.63 68.80 5.22 2.63 69.60 5.22 2.63 70.40 5.22 2.63 71.20 5.22 2.63 72.00 5.22 2.63 72.80 5.22 2.63 73.60 5.22 2.63 74.40 5.22 2.63 75.20 5.22 2.63 76.00 5.22 2.63 76.80 5.22 2.63 77.60 5.22 2.63 78.40 5.22 2.63 79.20 5.22 2.63 80.00 5.22 2.63 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 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

POA 2 proposed 2024-05-12 HydroCad - Proposed POA 2 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 113 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 53S: Basin 9 - Imp Runoff = 1.73 cfs @ 12.14 hrs, Volume= Routed to Pond 42P : Basin 9 6,699 cf, Depth= 4.98" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-80.00 hrs, dt= 0.04 hrs NOAA 24-hr D 10-Year Rainfall=5.22" Area (sf) 6,889 9,244 16,133 16,133 Tc (min) 7.2 Length (feet) 100 0.2 40 7.4 140 CN 98 98 98 Description Paved parking, HSG D Paved parking, HSG C Weighted Average 100.00% Impervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.1000 0.23 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" 0.0750 4.41 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps Total Subcatchment 53S: Basin 9 - Imp Hydrograph Runoff Flow (cfs) 1.73 cfs 1 0 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=16,133 sf Runoff Volume=6,699 cf Runoff Depth=4.98" Flow Length=140' Tc=7.4 min CN=98 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 74 76 78 80 Time (hours)

POA 2 proposed 2024-05-12 HydroCad - Proposed POA 2 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 114 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 53S: Basin 9 - Imp Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.80 0.05 0.00 1.60 0.10 0.01 2.40 0.15 0.04 3.20 0.21 0.08 4.00 0.27 0.12 4.80 0.34 0.18 5.60 0.41 0.24 6.40 0.48 0.30 7.20 0.57 0.39 8.00 0.68 0.48 8.80 0.80 0.59 9.60 0.94 0.74 10.40 1.14 0.93 11.20 1.46 1.24 12.00 2.50 2.27 12.80 3.76 3.53 13.60 4.08 3.84 14.40 4.28 4.04 15.20 4.42 4.19 16.00 4.54 4.31 16.80 4.65 4.41 17.60 4.74 4.50 18.40 4.81 4.57 19.20 4.88 4.64 20.00 4.95 4.71 20.80 5.01 4.77 21.60 5.07 4.83 22.40 5.12 4.88 23.20 5.17 4.94 24.00 5.22 4.98 24.80 5.22 4.98 25.60 5.22 4.98 26.40 5.22 4.98 27.20 5.22 4.98 28.00 5.22 4.98 28.80 5.22 4.98 29.60 5.22 4.98 30.40 5.22 4.98 31.20 5.22 4.98 32.00 5.22 4.98 32.80 5.22 4.98 33.60 5.22 4.98 34.40 5.22 4.98 35.20 5.22 4.98 36.00 5.22 4.98 36.80 5.22 4.98 37.60 5.22 4.98 38.40 5.22 4.98 39.20 5.22 4.98 40.00 5.22 4.98 Runoff (cfs) 0.00 0.00 0.01 0.01 0.02 0.02 0.03 0.03 0.03 0.04 0.05 0.06 0.07 0.10 0.19 0.92 0.23 0.11 0.08 0.06 0.05 0.05 0.04 0.03 0.03 0.03 0.03 0.03 0.02 0.02 0.02 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)

08 0.06 0.05 0.05 0.04 0.03 0.03 0.03 0.03 0.03 0.02 0.02 0.02 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) 40.80 5.22 4.98 41.60 5.22 4.98 42.40 5.22 4.98 43.20 5.22 4.98 44.00 5.22 4.98 44.80 5.22 4.98 45.60 5.22 4.98 46.40 5.22 4.98 47.20 5.22 4.98 48.00 5.22 4.98 48.80 5.22 4.98 49.60 5.22 4.98 50.40 5.22 4.98 51.20 5.22 4.98 52.00 5.22 4.98 52.80 5.22 4.98 53.60 5.22 4.98 54.40 5.22 4.98 55.20 5.22 4.98 56.00 5.22 4.98 56.80 5.22 4.98 57.60 5.22 4.98 58.40 5.22 4.98 59.20 5.22 4.98 60.00 5.22 4.98 60.80 5.22 4.98 61.60 5.22 4.98 62.40 5.22 4.98 63.20 5.22 4.98 64.00 5.22 4.98 64.80 5.22 4.98 65.60 5.22 4.98 66.40 5.22 4.98 67.20 5.22 4.98 68.00 5.22 4.98 68.80 5.22 4.98 69.60 5.22 4.98 70.40 5.22 4.98 71.20 5.22 4.98 72.00 5.22 4.98 72.80 5.22 4.98 73.60 5.22 4.98 74.40 5.22 4.98 75.20 5.22 4.98 76.00 5.22 4.98 76.80 5.22 4.98 77.60 5.22 4.98 78.40 5.22 4.98 79.20 5.22 4.98 80.00 5.22 4.98 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 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

POA 2 proposed 2024-05-12 HydroCad - Proposed POA 2 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 115 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 54S: Basin 9 - Perv Runoff = 0.65 cfs @ 12.15 hrs, Volume= Routed to Pond 42P : Basin 9 2,154 cf, Depth= 2.90" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-80.00 hrs, dt= 0.04 hrs NOAA 24-hr D 10-Year Rainfall=5.22" Area (sf) 2,537 6,379 8,916 8,916 Tc (min) 7.2 Length (feet) 100 0.2 40 7.4 140 CN 74 80 78 Description >75% Grass cover, Good, HSG C >75% Grass cover, Good, HSG D Weighted Average 100.00% Pervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.1000 0.23 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" 0.0750 4.41 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps Total Subcatchment 54S: Basin 9 - Perv Hydrograph Runoff 0.7 0.65 cfs 0.65 0.6 0.55 0.5 Flow (cfs) 0.45 0.4 0.35 0.3 0.25 0.2 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=8,916 sf Runoff Volume=2,154 cf Runoff Depth=2.90" Flow Length=140' Tc=7.4 min CN=78 0.15 0.1 0.05 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 74 76 78 80 Time (hours)

POA 2 proposed 2024-05-12 HydroCad - Proposed POA 2 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 116 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 54S: Basin 9 - Perv Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.80 0.05 0.00 1.60 0.10 0.00 2.40 0.15 0.00 3.20 0.21 0.00 4.00 0.27 0.00 4.80 0.34 0.00 5.60 0.41 0.00 6.40 0.48 0.00 7.20 0.57 0.00 8.00 0.68 0.00 8.80 0.80 0.02 9.60 0.94 0.04 10.40 1.14 0.10 11.20 1.46 0.22 12.00 2.50 0.79 12.80 3.76 1.70 13.60 4.08 1.95 14.40 4.28 2.11 15.20 4.42 2.23 16.00 4.54 2.33 16.80 4.65 2.41 17.60 4.74 2.49 18.40 4.81 2.55 19.20 4.88 2.61 20.00 4.95 2.67 20.80 5.01 2.72 21.60 5.07 2.77 22.40 5.12 2.82 23.20 5.17 2.86 24.00 5.22 2.90 24.80 5.22 2.90 25.60 5.22 2.90 26.40 5.22 2.90 27.20 5.22 2.90 28.00 5.22 2.90 28.80 5.22 2.90 29.60 5.22 2.90 30.40 5.22 2.90 31.20 5.22 2.90 32.00 5.22 2.90 32.80 5.22 2.90 33.60 5.22 2.90 34.40 5.22 2.90 35.20 5.22 2.90 36.00 5.22 2.90 36.80 5.22 2.90 37.60 5.22 2.90 38.40 5.22 2.90 39.20 5.22 2.90 40.00 5.22 2.90 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 0.01 0.02 0.04 0.31 0.10 0.05 0.04 0.03 0.02 0.02 0.02 0.02 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 Time Precip. Excess (hours) (inches)

04 0.03 0.02 0.02 0.02 0.02 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 Time Precip. Excess (hours) (inches) (inches) 40.80 5.22 2.90 41.60 5.22 2.90 42.40 5.22 2.90 43.20 5.22 2.90 44.00 5.22 2.90 44.80 5.22 2.90 45.60 5.22 2.90 46.40 5.22 2.90 47.20 5.22 2.90 48.00 5.22 2.90 48.80 5.22 2.90 49.60 5.22 2.90 50.40 5.22 2.90 51.20 5.22 2.90 52.00 5.22 2.90 52.80 5.22 2.90 53.60 5.22 2.90 54.40 5.22 2.90 55.20 5.22 2.90 56.00 5.22 2.90 56.80 5.22 2.90 57.60 5.22 2.90 58.40 5.22 2.90 59.20 5.22 2.90 60.00 5.22 2.90 60.80 5.22 2.90 61.60 5.22 2.90 62.40 5.22 2.90 63.20 5.22 2.90 64.00 5.22 2.90 64.80 5.22 2.90 65.60 5.22 2.90 66.40 5.22 2.90 67.20 5.22 2.90 68.00 5.22 2.90 68.80 5.22 2.90 69.60 5.22 2.90 70.40 5.22 2.90 71.20 5.22 2.90 72.00 5.22 2.90 72.80 5.22 2.90 73.60 5.22 2.90 74.40 5.22 2.90 75.20 5.22 2.90 76.00 5.22 2.90 76.80 5.22 2.90 77.60 5.22 2.90 78.40 5.22 2.90 79.20 5.22 2.90 80.00 5.22 2.90 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 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

POA 2 proposed 2024-05-12 HydroCad - Proposed POA 2 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 117 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Pond 21P: Basin 3 Inflow Area = 51,670 sf, 62.76% Impervious, Inflow Depth = 4.07" for 10-Year event Inflow = 4.59 cfs @ 12.15 hrs, Volume= 17,540 cf Outflow = 3.95 cfs @ 12.20 hrs, Volume= 17,540 cf, Atten= 14%, Lag= 3.1 min Discarded = 1.21 cfs @ 11.88 hrs, Volume= 15,267 cf Primary = 2.74 cfs @ 12.20 hrs, Volume= 2,272 cf Routed to Pond 27P : Basin 2 Routing by Stor-Ind method, Time Span= 0.00-80.00 hrs, dt= 0.04 hrs Peak Elev= 559.58' @ 12.20 hrs Surf.Area= 5,227 sf Storage= 1,206 cf Plug-Flow detention time= 2.4 min calculated for 17,531 cf (100% of inflow) Center-of-Mass det. time= 2.4 min ( 775.6 - 773.3 ) Volume #1 Invert 559.00' Elevation (feet) 559.00 560.00 561.00 561.17 Device #1 #2 Avail.Storage 4,537 cf Surf.Area (sq-ft) 5,227 5,227 5,227 5,227 Routing Primary Discarded Invert 559.22' 559.00' Storage Description Custom Stage Data (Prismatic) Listed below 11,343 cf Overall x 40.0% Voids Inc.Store (cubic-feet) 0 5,227 5,227 889 Cum.Store (cubic-feet) 0 5,227 10,454 11,343 Outlet Devices 4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) 10.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=1.21 cfs @ 11.88 hrs HW=559.03' (Free Discharge) 2=Exfiltration (Exfiltration Controls 1.21 cfs) Primary OutFlow Max=2.70 cfs @ 12.20 hrs HW=559.57' (Free Discharge) 1=Sharp-Crested Rectangular Weir (Weir Controls 2.70 cfs @ 1.95 fps)

POA 2 proposed 2024-05-12 HydroCad - Proposed POA 2 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 118 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 21P: Basin 3 Hydrograph 4.59 cfs Inflow Area=51,670 sf Peak Elev=559.58' Storage=1,206 cf 5 3.95 cfs Flow (cfs) 4 3 Inflow Outflow Discarded Primary 2.74 cfs 2 1.21 cfs 1 0 0 5 10 15 20 25 30 35 40 45 Time (hours) 50 55 60 65 70 75 80 Pond 21P: Basin 3 Stage-Discharge Total Discarded Primary Elevation (feet) 561 560 Sharp-Crested Rectangular Weir Exfiltration 559 0 5 10 15 20 Discharge (cfs) 25 30

POA 2 proposed 2024-05-12 HydroCad - Proposed POA 2 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 119 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 21P: Basin 3 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 74.00 76.00 78.00 80.00 Inflow (cfs) 0.00 0.02 0.05 0.06 0.10 0.19 2.25 0.28 0.16 0.11 0.09 0.08 0.06 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 Storage (cubic-feet) 0 1 2 2 4 7 270 11 6 4 3 3 2 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 Elevation (feet) 559.00 559.00 559.00 559.00 559.00 559.00 559.13 559.01 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 Outflow (cfs) 0.00 0.02 0.05 0.06 0.10 0.19 1.21 0.28 0.16 0.11 0.09 0.08 0.06 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 Discarded (cfs) 0.00 0.02 0.05 0.06 0.10 0.19 1.21 0.28 0.16 0.11 0.09 0.08 0.06 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 Primary (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 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