250701_42 ERW_Stormwater Report

NJ DEP 2-hr WQ Rainfall=1.25" 250624_42 ERW Waymaker Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 7/1/2025 Page 46 Summary for Subcatchment PR 1B-P: Runoff = 0.68 cfs @ Routed to Reach 10R : 1.17 hrs, Volume= 0.023 af, Depth= 0.15" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NJ DEP 2-hr WQ Rainfall=1.25" Area (sf) 53,321 23,874 77,195 77,195 CN 74 89 79 Description >75% Grass cover, Good, HSG C Gravel roads, HSG C Weighted Average 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.2 100 0.0400 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 0.3 80 0.0812 4.59 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 7.5 180 Total Subcatchment PR 1B-P: Hydrograph 0.75 Runoff 0.7 0.68 cfs 0.65 0.6 0.55 Flow (cfs) 0.5 0.45 0.4 0.35 0.3 0.25 0.2 NJ DEP 2-hr WQ Rainfall=1.25" Runoff Area=77,195 sf Runoff Volume=0.023 af Runoff Depth=0.15" Flow Length=180' Tc=7.5 min CN=79 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)

NJ DEP 2-hr WQ Rainfall=1.25" 250624_42 ERW Waymaker Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 7/1/2025 Page 47 Summary for Reach 10R: [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 2.619 ac, 32.35% Impervious, Inflow Depth = 0.44" for WQ event Inflow = 2.67 cfs @ 1.04 hrs, Volume= 0.096 af Outflow = 2.67 cfs @ 1.04 hrs, Volume= 0.096 af, Atten= 0%, Lag= 0.0 min Routed to Pond BASIN : Routing by Stor-Ind+Trans method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Reach 10R: Hydrograph 2.67 cfs 2.67 cfs Inflow Outflow Inflow Area=2.619 ac Flow (cfs) 2 1 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" 250624_42 ERW Waymaker Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 7/1/2025 Page 48 Summary for Reach DP1-PR: [40] Hint: Not Described (Outflow=Inflow) Inflow Area = Inflow = Outflow = 2.922 ac, 29.00% Impervious, Inflow Depth = 0.01" for WQ event 0.11 cfs @ 1.16 hrs, Volume= 0.003 af 0.11 cfs @ 1.16 hrs, Volume= 0.003 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Reach DP1-PR: 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=2.922 ac Inflow Outflow

NJ DEP 2-hr WQ Rainfall=1.25" 250624_42 ERW Waymaker Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 7/1/2025 Page 49 Summary for Pond BASIN: Inflow Area = 2.619 ac, 32.35% Impervious, Inflow Depth = 0.44" for WQ event Inflow = 2.67 cfs @ 1.04 hrs, Volume= 0.096 af Outflow = 0.48 cfs @ 1.57 hrs, Volume= 0.096 af, Atten= 82%, Lag= 31.5 min Discarded = 0.48 cfs @ 1.57 hrs, Volume= 0.096 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Reach DP1-PR : Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 15.96' @ 1.57 hrs Surf.Area= 0.108 ac Storage= 0.052 af Plug-Flow detention time= 49.3 min calculated for 0.096 af (100% of inflow) Center-of-Mass det. time= 49.3 min ( 119.9 - 70.5 ) Volume #1A Invert 15.00' Avail.Storage 0.129 af #2A 15.75' 0.216 af 0.345 af Storage Description 44.25'W x 106.08'L x 5.00'H Field A 0.539 af Overall - 0.216 af Embedded = 0.323 af x 40.0% Voids ADS_StormTech MC-3500 d +Cap x 84 Inside #1 Effective Size= 70.4"W x 45.0"H => 15.33 sf x 7.17'L = 110.0 cf Overall Size= 77.0"W x 45.0"H x 7.50'L with 0.33' Overlap 84 Chambers in 6 Rows Cap Storage= 14.9 cf x 2 x 6 rows = 178.8 cf Total Available Storage Storage Group A created with Chamber Wizard Device #1 Routing Primary Invert 15.96' #2 Primary 16.55' #3 Primary 18.90' #4 Discarded 15.00' Outlet Devices 3.5" Vert. Orifice/Grate X 4.00 C= 0.600 Limited to weir flow at low heads 5.0" Vert. Orifice/Grate X 3.00 C= 0.600 Limited to weir flow at low heads 1.0' long x 0.5' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 Coef. (English) 2.80 2.92 3.08 3.30 3.32 3.000 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 13.00' Discarded OutFlow Max=0.48 cfs @ 1.57 hrs HW=15.96' (Free Discharge) 4=Exfiltration ( Controls 0.48 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=15.00' (Free Discharge) 1=Orifice/Grate ( Controls 0.00 cfs) 2=Orifice/Grate ( Controls 0.00 cfs) 3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)

250624_42 ERW Waymaker NJ DEP 2-hr WQ Rainfall=1.25" Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 7/1/2025 Page 50 Pond BASIN: - Chamber Wizard Field A Chamber Model = ADS_StormTech MC-3500 d +Cap (ADS StormTech® MC-3500 d rev 03/14 with Cap volume) Effective Size= 70.4"W x 45.0"H => 15.33 sf x 7.17'L = 110.0 cf Overall Size= 77.0"W x 45.0"H x 7.50'L with 0.33' Overlap Cap Storage= 14.9 cf x 2 x 6 rows = 178.8 cf 77.0" Wide + 9.0" Spacing = 86.0" C-C Row Spacing 14 Chambers/Row x 7.17' Long +1.85' Cap Length x 2 = 104.08' Row Length +12.0" End Stone x 2 = 106.08' Base Length 6 Rows x 77.0" Wide + 9.0" Spacing x 5 + 12.0" Side Stone x 2 = 44.25' Base Width 9.0" Stone Base + 45.0" Chamber Height + 6.0" Stone Cover = 5.00' Field Height 84 Chambers x 110.0 cf + 14.9 cf Cap Volume x 2 x 6 Rows = 9,414.8 cf Chamber Storage 23,470.2 cf Field - 9,414.8 cf Chambers = 14,055.4 cf Stone x 40.0% Voids = 5,622.2 cf Stone Storage Chamber Storage + Stone Storage = 15,036.9 cf = 0.345 af Overall Storage Efficiency = 64.1% Overall System Size = 106.08' x 44.25' x 5.00' 84 Chambers 869.3 cy Field 520.6 cy Stone

NJ DEP 2-hr WQ Rainfall=1.25" 250624_42 ERW Waymaker Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 7/1/2025 Page 51 Pond BASIN: Hydrograph 2.67 cfs Inflow Area=2.619 ac Peak Elev=15.96' Storage=0.052 af Flow (cfs) 2 1 0.48 cfs 0.48 cfs 0.00 cfs 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) Inflow Outflow Discarded Primary

NOAA 24-hr D 50-Year Rainfall=7.49" 250624_42 ERW Waymaker Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 7/1/2025 Page 52 Time span=0.00-72.00 hrs, dt=0.05 hrs, 1441 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment PR 1A-P: Runoff Area=13,167 sf 0.00% Impervious Runoff Depth=4.92" Flow Length=203' Tc=5.9 min CN=78 Runoff=1.67 cfs 0.124 af Subcatchment PR 1B-I: Runoff Area=36,906 sf 100.00% Impervious Runoff Depth=7.25" Flow Length=136' Tc=1.5 min CN=98 Runoff=6.66 cfs 0.512 af Subcatchment PR 1B-P: Runoff Area=77,195 sf 0.00% Impervious Runoff Depth=5.03" Flow Length=180' Tc=7.5 min CN=79 Runoff=9.58 cfs 0.744 af Reach 10R: Inflow=14.51 cfs 1.255 af Outflow=14.51 cfs 1.255 af Reach DP1-PR: Inflow=6.31 cfs 0.720 af Outflow=6.31 cfs 0.720 af Pond BASIN: Peak Elev=19.07' Storage=0.303 af Inflow=14.51 cfs 1.255 af Discarded=0.99 cfs 0.660 af Primary=5.40 cfs 0.596 af Outflow=6.39 cfs 1.255 af Total Runoff Area = 2.922 ac Runoff Volume = 1.379 af Average Runoff Depth = 5.67" 71.00% Pervious = 2.074 ac 29.00% Impervious = 0.847 ac

NOAA 24-hr D 50-Year Rainfall=7.49" 250624_42 ERW Waymaker Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 7/1/2025 Page 53 Summary for Subcatchment PR 1A-P: [49] Hint: Tc<2dt may require smaller dt Runoff = 1.67 cfs @ 12.13 hrs, Volume= Routed to Reach DP1-PR : 0.124 af, Depth= 4.92" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA 24-hr D 50-Year Rainfall=7.49" Area (sf) 9,975 3,192 13,167 13,167 CN 74 89 78 Description >75% Grass cover, Good, HSG C Gravel roads, HSG C Weighted Average 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.6 100 0.0725 0.30 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 0.3 103 0.1090 5.32 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 5.9 203 Total Subcatchment PR 1A-P: Hydrograph Runoff Flow (cfs) 1.67 cfs 1 0 0 NOAA 24-hr D 50-Year Rainfall=7.49" Runoff Area=13,167 sf Runoff Volume=0.124 af Runoff Depth=4.92" Flow Length=203' Tc=5.9 min CN=78 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)

NOAA 24-hr D 50-Year Rainfall=7.49" 250624_42 ERW Waymaker Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 7/1/2025 Page 54 Summary for Subcatchment PR 1B-I: [49] Hint: Tc<2dt may require smaller dt Runoff = 6.66 cfs @ 12.07 hrs, Volume= Routed to Reach 10R : 0.512 af, Depth= 7.25" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA 24-hr D 50-Year Rainfall=7.49" Area (sf) 21,449 15,457 36,906 36,906 CN 98 98 98 Description Roofs, HSG C Paved parking, HSG C Weighted Average 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.2 100 0.0200 1.43 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.44" 0.3 36 0.0139 2.39 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.5 136 Total Subcatchment PR 1B-I: Hydrograph Runoff 7 6.66 cfs 6 Flow (cfs) 5 4 3 2 NOAA 24-hr D 50-Year Rainfall=7.49" Runoff Area=36,906 sf Runoff Volume=0.512 af Runoff Depth=7.25" Flow Length=136' Tc=1.5 min CN=98 1 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)

NOAA 24-hr D 50-Year Rainfall=7.49" 250624_42 ERW Waymaker Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 7/1/2025 Page 55 Summary for Subcatchment PR 1B-P: Runoff = 9.58 cfs @ 12.15 hrs, Volume= Routed to Reach 10R : 0.744 af, Depth= 5.03" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA 24-hr D 50-Year Rainfall=7.49" Area (sf) 53,321 23,874 77,195 77,195 CN 74 89 79 Description >75% Grass cover, Good, HSG C Gravel roads, HSG C Weighted Average 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.2 100 0.0400 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 0.3 80 0.0812 4.59 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 7.5 180 Total Subcatchment PR 1B-P: Hydrograph Runoff 10 9.58 cfs 9 8 Flow (cfs) 7 6 5 4 3 NOAA 24-hr D 50-Year Rainfall=7.49" Runoff Area=77,195 sf Runoff Volume=0.744 af Runoff Depth=5.03" Flow Length=180' Tc=7.5 min CN=79 2 1 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)