1240815StormWaterManagementReportrcd 3 12 2026

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C Water Quality Storm Water Quality Rainfall=1.25", P2=3.47" Prepared by Casey & Keller, Inc Printed 2/4/2026 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC Summary for Pond 3: Pervious Pavers Inflow Area = 0.176 ac, 86.88% Impervious, Inflow Depth = 0.91" for Water Quality event Inflow = 0.46 cfs @ 1.07 hrs, Volume= 0.013 af Outflow = 0.11 cfs @ 0.95 hrs, Volume= 0.013 af, Atten= 77%, Lag= 0.0 min Discarded = 0.11 cfs @ 0.95 hrs, Volume= 0.013 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Pond 5 : Pipes Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 413.90' @ 1.27 hrs Surf.Area= 1,620 sf Storage= 256 cf Plug-Flow detention time= 21.6 min calculated for 0.013 af (100% of inflow) Center-of-Mass det. time= 21.6 min ( 89.7 - 68.1 ) Volume Invert Avail.Storage Storage Description #1 413.50' 1,730 cf 60.00'W x 27.00'L x 2.67'H STONE & PAVERS 4,325 cf Overall x 40.0% Voids Device Routing Invert Outlet Devices #1 Discarded 413.50' 2.900 in/hr Exfiltration over Surface area #2 Primary 414.50' 6.0" Round Culvert L= 50.0' Ke= 0.200 Inlet / Outlet Invert= 414.50' / 414.17' S= 0.0066 '/' Cc= 0.900 n= 0.010 PVC, smooth interior, Flow Area= 0.20 sf Discarded OutFlow Max=0.11 cfs @ 0.95 hrs HW=413.54' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.11 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=413.50' (Free Discharge) 2=Culvert ( Controls 0.00 cfs) 127

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C Water Quality Storm Water Quality Rainfall=1.25", P2=3.47" Prepared by Casey & Keller, Inc Printed 2/4/2026 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC Pond 3: Pervious Pavers Hydrograph 0.46 cfs Inflow Outflow Inflow Area=0.176 ac Discarded Primary 0.5 Peak Elev=413.90' 0.45 Storage=256 cf 0.4 0.35 0.3 Flow (cfs) 0.25 0.2 0.11 cfs 0.11 cfs 0.15 0.1 0.05 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) 128

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C Water Quality Storm Water Quality Rainfall=1.25", P2=3.47" Prepared by Casey & Keller, Inc Printed 2/4/2026 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC Summary for Pond 5: Pipes Inflow Area = 0.343 ac, 76.01% Impervious, Inflow Depth = 0.34" for Water Quality event Inflow = 0.33 cfs @ 1.07 hrs, Volume= 0.010 af Outflow = 0.27 cfs @ 1.13 hrs, Volume= 0.010 af, Atten= 19%, Lag= 3.8 min Discarded = 0.03 cfs @ 0.80 hrs, Volume= 0.005 af Primary = 0.24 cfs @ 1.13 hrs, Volume= 0.005 af Routed to Link 7 : Proposed Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 411.28' @ 1.13 hrs Surf.Area= 400 sf Storage= 140 cf Plug-Flow detention time= 20.0 min calculated for 0.010 af (100% of inflow) Center-of-Mass det. time= 20.0 min ( 88.6 - 68.6 ) Volume Invert Avail.Storage Storage Description #1 410.50' 329 cf 10.00'W x 40.00'L x 3.00'H STONE 1,200 cf Overall - 377 cf Embedded = 823 cf x 40.0% Voids #2 411.00' 377 cf 24.0" Round Pipe Storage x 3 Inside #1 L= 40.0' S= 0.0020 '/' 706 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 410.50' 2.900 in/hr Exfiltration over Surface area #2 Primary 411.00' 12.0" Round Culvert L= 14.0' Ke= 0.100 Inlet / Outlet Invert= 411.00' / 410.94' S= 0.0043 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 0.79 sf #3 Device 2 411.00' 8.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads #4 Device 2 413.90' 24.0" x 24.0" Horiz. Grate C= 0.600 Limited to weir flow at low heads Discarded OutFlow Max=0.03 cfs @ 0.80 hrs HW=410.54' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=0.23 cfs @ 1.13 hrs HW=411.27' (Free Discharge) 2=Culvert (Barrel Controls 0.23 cfs @ 2.00 fps) 3=Orifice

ree Discharge) 1=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=0.23 cfs @ 1.13 hrs HW=411.27' (Free Discharge) 2=Culvert (Barrel Controls 0.23 cfs @ 2.00 fps) 3=Orifice (Passes 0.23 cfs of 0.24 cfs potential flow) 4=Grate ( Controls 0.00 cfs) 129

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C Water Quality Storm Water Quality Rainfall=1.25", P2=3.47" Prepared by Casey & Keller, Inc Printed 2/4/2026 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC Pond 5: Pipes Hydrograph 0.33 cfs Inflow Outflow 0.36 Inflow Area=0.343 ac Discarded Primary 0.34 0.32 0.27 cfs Peak Elev=411.28' 0.3 Storage=140 cf 0.28 0.260.24 cfs 0.24 0.22 Flow (cfs) 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.03 cfs 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) 130

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C Water Quality Storm Water Quality Rainfall=1.25", P2=3.47" Prepared by Casey & Keller, Inc Printed 2/4/2026 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC Summary for Link 7: Proposed Inflow Area = 0.373 ac, 69.84% Impervious, Inflow Depth = 0.16" for Water Quality event Inflow = 0.24 cfs @ 1.14 hrs, Volume= 0.005 af Primary = 0.24 cfs @ 1.14 hrs, Volume= 0.005 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Link 7: Proposed Hydrograph Inflow 0.24 cfs Primary 0.260.24 cfs 0.24 Inflow Area=0.373 ac 0.22 0.2 0.18 0.16 Flow (cfs) 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) 131

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V V DRAINAGE DRAINAGE COLLECTION COLLECTION SYSTEM SYSTEM CALCULATIONS CALCULATIONS 133 133

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Up Down Up stream stream Down Total Full Pipe stream Pipe Pipe Up Down stream Rainfall Pipe Up stream Down stream DA Runoff CA Intensity Runoff Flow Length Size Slope Velocity Tc Invert Invert stream stream Rim Elev Event Name Node Node (Acres) Coef. (Accum.) (in/hr) (cfs) (cfs) (ft) (in) (ft/ft) n (fps) (min) (ft) (ft) HGL (ft) HGL (ft) (ft) 100 YEAR P1 ROOF CO1 0.02 0.99 0.02 7.61 0.12 0.37 2 6 0.010 0.020 1.48 10.00 418.85 418.83 419.06 419.05 421.00 100 YEAR P2 CO1 CO2-ROOF2 0.00 0.00 0.02 7.60 0.12 0.94 84 6 0.067 0.020 1.99 10.02 418.83 413.22 419.00 413.44 417.00 100 YEAR P3 CO2-ROOF2 BASIN1 0.01 0.99 0.03 7.40 0.19 0.92 7 6 0.064 0.020 3.71 10.95 413.22 412.75 413.37 412.90 414.62 100 YEAR P4 ROOF3 CO3 0.02 0.99 0.02 7.61 0.17 0.52 15 6 0.020 0.020 2.21 10.00 413.00 412.70 413.20 412.98 414.00 100 YEAR P5 CO3 INLET1 0.00 0.00 0.02 7.58 0.17 0.51 42 6 0.020 0.020 2.24 10.14 412.70 411.86 412.91 412.16 414.67 100 YEAR P6 INLET1 BASIN2 0.02 0.51 0.04 7.49 0.26 0.52 18 6 0.021 0.020 2.66 10.54 411.86 411.50 412.11 411.75 414.23 100 YEAR P8 ROOF4 BASIN-3 0.02 0.99 0.02 7.61 0.14 0.36 10 6 0.010 0.020 1.68 10.00 412.60 412.50 412.84 412.68 416.00 100 YEAR P10 ROOF5 BASIN4 0.02 0.99 0.02 7.61 0.14 0.36 10 6 0.010 0.020 1.70 10.00 412.60 412.50 412.83 412.68 414.37 135