complete drainage report rev 9

NJ DEP 2-hr WQ Rainfall=1.25" Combined FT (8-22-24) Prepared by Contech Engineered Solutions HydroCAD® 10.20-3f s/n 00447 © 2023 HydroCAD Software Solutions LLC Printed 8/26/2024 Page 28 Summary for Subcatchment 18i: Imp Runoff = 0.32 cfs @ 1.08 hrs, Volume= Routed to Pond 18FT : 8x6 FT 395 cf, Depth= 1.03" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NJ DEP 2-hr WQ Rainfall=1.25" Area (sf) 4,582 4,582 Tc (min) 0.7 Length (feet) 100 0.8 190 1.5 290 CN 98 Description Paved parking, HSG D 100.00% Impervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.0700 2.36 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.47" 0.0380 3.96 Shallow Concentrated Flow, Paved Kv= 20.3 fps Total Subcatchment 18i: Imp Hydrograph 0.36 Runoff 0.34 0.32 cfs NJ DEP 2-hr WQ Rainfall=1.25" Runoff Area=4,582 sf Runoff Volume=395 cf Runoff Depth=1.03" Flow Length=290' Tc=1.5 min CN=98 0.32 0.3 0.28 0.26 0.24 Flow (cfs) 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 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)

NJ DEP 2-hr WQ Rainfall=1.25" Combined FT (8-22-24) Prepared by Contech Engineered Solutions HydroCAD® 10.20-3f s/n 00447 © 2023 HydroCAD Software Solutions LLC Printed 8/26/2024 Page 29 Summary for Subcatchment 18p: Perv Runoff = 0.03 cfs @ 1.09 hrs, Volume= Routed to Pond 18FT : 8x6 FT 24 cf, Depth= 0.17" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NJ DEP 2-hr WQ Rainfall=1.25" Area (sf) 1,677 1,677 Tc (min) 1.5 Length (feet) 190 CN 80 Description >75% Grass cover, Good, HSG D 100.00% Pervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.0380 2.11 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.47" Subcatchment 18p: Perv Hydrograph 0.03 0.028 Runoff 0.03 cfs 0.026 0.024 0.022 Flow (cfs) 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 NJ DEP 2-hr WQ Rainfall=1.25" Runoff Area=1,677 sf Runoff Volume=24 cf Runoff Depth=0.17" Flow Length=190' Slope=0.0380 '/' Tc=1.5 min CN=80 0.004 0.002 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)

NJ DEP 2-hr WQ Rainfall=1.25" Combined FT (8-22-24) Prepared by Contech Engineered Solutions HydroCAD® 10.20-3f s/n 00447 © 2023 HydroCAD Software Solutions LLC Printed 8/26/2024 Page 30 Summary for Subcatchment 21i: Imp Runoff = 0.15 cfs @ 1.08 hrs, Volume= Routed to Pond 21FT : 6x4 FT 177 cf, Depth= 1.03" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NJ DEP 2-hr WQ Rainfall=1.25" Area (sf) 2,050 2,050 Tc (min) 0.8 Length (feet) 100 0.5 153 1.3 253 CN 98 Description Paved parking, HSG D 100.00% Impervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.0500 2.07 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.47" 0.0530 4.67 Shallow Concentrated Flow, Paved Kv= 20.3 fps Total Subcatchment 21i: Imp Hydrograph 0.16 Runoff 0.15 0.15 cfs NJ DEP 2-hr WQ Rainfall=1.25" Runoff Area=2,050 sf Runoff Volume=177 cf Runoff Depth=1.03" Flow Length=253' Tc=1.3 min CN=98 0.14 0.13 0.12 0.11 Flow (cfs) 0.1 0.09 0.08 0.07 0.06 0.05 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)

NJ DEP 2-hr WQ Rainfall=1.25" Combined FT (8-22-24) Prepared by Contech Engineered Solutions HydroCAD® 10.20-3f s/n 00447 © 2023 HydroCAD Software Solutions LLC Printed 8/26/2024 Page 31 Summary for Subcatchment 21p: Perv Runoff = 0.00 cfs @ 1.09 hrs, Volume= Routed to Pond 21FT : 6x4 FT 4 cf, Depth= 0.17" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NJ DEP 2-hr WQ Rainfall=1.25" Area (sf) 270 270 Tc (min) 0.8 Length (feet) 100 0.5 153 1.3 253 CN 80 Description >75% Grass cover, Good, HSG D 100.00% Pervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.0500 2.07 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.47" 0.0530 4.67 Shallow Concentrated Flow, Paved Kv= 20.3 fps Total Subcatchment 21p: Perv Flow (cfs) Hydrograph 0.005 0.005 0.00 cfs 0.005 0.004 0.004 0.004 0.004 0.004 0.003 0.003 0.003 0.003 0.003 0.002 0.002 0.002 0.002 0.002 0.001 0.001 0.001 0.001 0.001 0.000 0.000 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) NJ DEP 2-hr WQ Rainfall=1.25" Runoff Area=270 sf Runoff Volume=4 cf Runoff Depth=0.17" Flow Length=253' Tc=1.3 min CN=80 Runoff

NJ DEP 2-hr WQ Rainfall=1.25" Combined FT (8-22-24) Prepared by Contech Engineered Solutions HydroCAD® 10.20-3f s/n 00447 © 2023 HydroCAD Software Solutions LLC Printed 8/26/2024 Page 32 Summary for Subcatchment 22i: Imp Runoff = 0.28 cfs @ 1.08 hrs, Volume= Routed to Pond 22FT : 8x6 FT 336 cf, Depth= 1.03" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NJ DEP 2-hr WQ Rainfall=1.25" Area (sf) 3,893 3,893 Tc (min) 0.8 Length (feet) 100 0.5 153 1.3 253 CN 98 Description Paved parking, HSG D 100.00% Impervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.0500 2.07 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.47" 0.0530 4.67 Shallow Concentrated Flow, Paved Kv= 20.3 fps Total Subcatchment 22i: Imp Hydrograph Runoff 0.3 0.28 0.28 cfs NJ DEP 2-hr WQ Rainfall=1.25" Runoff Area=3,893 sf Runoff Volume=336 cf Runoff Depth=1.03" Flow Length=253' Tc=1.3 min CN=98 0.26 0.24 0.22 Flow (cfs) 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 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)

NJ DEP 2-hr WQ Rainfall=1.25" Combined FT (8-22-24) Prepared by Contech Engineered Solutions HydroCAD® 10.20-3f s/n 00447 © 2023 HydroCAD Software Solutions LLC Printed 8/26/2024 Page 33 Summary for Subcatchment 22p: Perv Runoff = 0.09 cfs @ 1.09 hrs, Volume= Routed to Pond 22FT : 8x6 FT 76 cf, Depth= 0.17" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NJ DEP 2-hr WQ Rainfall=1.25" Area (sf) 5,247 5,247 Tc (min) 0.8 Length (feet) 100 0.5 153 1.3 253 CN 80 Description >75% Grass cover, Good, HSG D 100.00% Pervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.0500 2.07 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.47" 0.0530 4.67 Shallow Concentrated Flow, Paved Kv= 20.3 fps Total Subcatchment 22p: Perv Hydrograph Runoff 0.095 0.09 0.09 cfs 0.085 0.08 0.075 0.07 0.065 Flow (cfs) 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 NJ DEP 2-hr WQ Rainfall=1.25" Runoff Area=5,247 sf Runoff Volume=76 cf Runoff Depth=0.17" Flow Length=253' Tc=1.3 min CN=80 0.015 0.01 0.005 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)

NJ DEP 2-hr WQ Rainfall=1.25" Combined FT (8-22-24) Prepared by Contech Engineered Solutions HydroCAD® 10.20-3f s/n 00447 © 2023 HydroCAD Software Solutions LLC Printed 8/26/2024 Page 34 Summary for Pond 1FT: 4x4 FT Inflow Area = Inflow = Outflow = Primary = 4,204 sf, 22.91% Impervious, Inflow Depth = 0.37" for WQ event 0.10 cfs @ 1.12 hrs, Volume= 130 cf 0.10 cfs @ 1.12 hrs, Volume= 130 cf, Atten= 0%, Lag= 0.0 min 0.10 cfs @ 1.12 hrs, Volume= 130 cf Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 0.01' @ 1.12 hrs Surf.Area= 16 sf Storage= 0 cf Plug-Flow detention time= 0.0 min calculated for 130 cf (100% of inflow) Center-of-Mass det. time= 0.0 min ( 74.2 - 74.2 ) Volume #1 Device #1 Invert 0.00' Routing Primary Avail.Storage 12 cf Invert 0.00' Storage Description 4.00'W x 4.00'L x 0.75'H Prismatoid Outlet Devices 300.000 in/hr Exfiltration over Surface area Primary OutFlow Max=0.11 cfs @ 1.12 hrs HW=0.01' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.11 cfs @ 0.01 fps) Pond 1FT: 4x4 FT Hydrograph 0.10 cfs 0.11 0.105 0.10 cfs 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 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) Flow (cfs) Inflow Area=4,204 sf Peak Elev=0.01' Storage=0 cf Inflow Primary

NJ DEP 2-hr WQ Rainfall=1.25" Combined FT (8-22-24) Prepared by Contech Engineered Solutions HydroCAD® 10.20-3f s/n 00447 © 2023 HydroCAD Software Solutions LLC Printed 8/26/2024 Page 35 Summary for Pond 2FT: 4x4 FT Inflow Area = Inflow = Outflow = Primary = 2,862 sf, 46.30% Impervious, Inflow Depth = 0.57" for WQ event 0.11 cfs @ 1.11 hrs, Volume= 136 cf 0.11 cfs @ 1.11 hrs, Volume= 136 cf, Atten= 0%, Lag= 0.0 min 0.11 cfs @ 1.11 hrs, Volume= 136 cf Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 0.01' @ 1.11 hrs Surf.Area= 16 sf Storage= 0 cf Plug-Flow detention time= 0.0 min calculated for 136 cf (100% of inflow) Center-of-Mass det. time= 0.0 min ( 71.8 - 71.7 ) Volume #1 Device #1 Invert 0.00' Routing Primary Avail.Storage 12 cf Invert 0.00' Storage Description 4.00'W x 4.00'L x 0.75'H Prismatoid Outlet Devices 300.000 in/hr Exfiltration over Surface area Primary OutFlow Max=0.11 cfs @ 1.11 hrs HW=0.01' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.11 cfs @ 0.01 fps) Pond 2FT: 4x4 FT Hydrograph 0.11 cfs 0.115 0.11 0.11 cfs 0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 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) Flow (cfs) Inflow Area=2,862 sf Peak Elev=0.01' Storage=0 cf Inflow Primary

NJ DEP 2-hr WQ Rainfall=1.25" Combined FT (8-22-24) Prepared by Contech Engineered Solutions HydroCAD® 10.20-3f s/n 00447 © 2023 HydroCAD Software Solutions LLC Printed 8/26/2024 Page 36 Summary for Pond 3FT: 6x4 FT Inflow Area = Inflow = Outflow = Primary = 3,376 sf, 59.48% Impervious, Inflow Depth = 0.69" for WQ event 0.17 cfs @ 1.08 hrs, Volume= 193 cf 0.17 cfs @ 1.08 hrs, Volume= 193 cf, Atten= 0%, Lag= 0.0 min 0.17 cfs @ 1.08 hrs, Volume= 193 cf Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 0.01' @ 1.08 hrs Surf.Area= 24 sf Storage= 0 cf Plug-Flow detention time= 0.0 min calculated for 193 cf (100% of inflow) Center-of-Mass det. time= 0.0 min ( 66.7 - 66.6 ) Volume #1 Device #1 Invert 0.00' Routing Primary Avail.Storage 18 cf Invert 0.00' Storage Description 6.00'W x 4.00'L x 0.75'H Prismatoid Outlet Devices 300.000 in/hr Exfiltration over Surface area Primary OutFlow Max=0.17 cfs @ 1.08 hrs HW=0.01' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.17 cfs @ 0.01 fps) Pond 3FT: 6x4 FT Hydrograph 0.18 0.17 0.16 0.15 0.14 0.13 0.17 cfs 0.17 cfs Inflow Primary Inflow Area=3,376 sf Peak Elev=0.01' Storage=0 cf Flow (cfs) 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 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)

NJ DEP 2-hr WQ Rainfall=1.25" Combined FT (8-22-24) Prepared by Contech Engineered Solutions HydroCAD® 10.20-3f s/n 00447 © 2023 HydroCAD Software Solutions LLC Printed 8/26/2024 Page 37 Summary for Pond 4FT: 12x6 FT Inflow Area = Inflow = Outflow = Primary = 16,388 sf, 43.94% Impervious, Inflow Depth = 0.55" for WQ event 0.66 cfs @ 1.09 hrs, Volume= 753 cf 0.50 cfs @ 1.00 hrs, Volume= 740 cf, Atten= 25%, Lag= 0.0 min 0.50 cfs @ 1.00 hrs, Volume= 740 cf Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 0.49' @ 1.10 hrs Surf.Area= 72 sf Storage= 35 cf Plug-Flow detention time= 1.1 min calculated for 740 cf (98% of inflow) Center-of-Mass det. time= 0.2 min ( 68.5 - 68.3 ) Volume #1 Device #1 Invert 0.00' Routing Primary Avail.Storage 54 cf Invert 0.00' Storage Description 12.00'W x 6.00'L x 0.75'H Prismatoid Outlet Devices 300.000 in/hr Exfiltration over Surface area Primary OutFlow Max=0.50 cfs @ 1.00 hrs HW=0.01' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.50 cfs @ 0.01 fps) Pond 4FT: 12x6 FT Hydrograph 0.7 0.66 cfs 0.65 0.6 0.55 0.5 0.50 cfs Inflow Primary Inflow Area=16,388 sf Peak Elev=0.49' Storage=35 cf Flow (cfs) 0.45 0.4 0.35 0.3 0.25 0.2 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 Time (hours)