Stormwater Report

1240815-pipes Prepared by Casey & Keller, Inc 512-516 Pleasant Valley Way, West Orange NOAA 24-hr D 100-Year-2020 Rainfall=9. 18", P2=3.47" Printed 8/25/2025 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC Page 32 Subcatchment 2: Parking Lot Hydrograph Flow (cfs) NOAA 24-hr D 100-Year-2020 Rainfall=9.18" P2=3.47" Runoff Area=7,305 sf Runoff Volume=0.121 af Runoff Depth=8.69" Flow Length=92' Tc=0.9 min CN=74/98 0 y y yee 0 2 4 6 B 10 1214 16 18 20 22 24 26 28 30 32 34 36 3B 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) 39

512-516 Pleasant Valley Way, West Orange 1240815-pipes NOAA 24-hr D 100-Year-2020 Rainfall=9.18", P2=3.47" Prepared by Casey & Keller, Inc Printed 8/25/2025 HydroCAD® 10.20-7a_s/n 03272 © 2025 HydroCAD Software Solutions LLC Page 33 Summary for Pond 3: Pervious Pavers Inflow Area = 0.168 ac, 91.47% Impervious, Inflow Depth = 8.69" for 100-Year-2020 event Inflow = 1.59 cfs @ 12.06 hrs, Volume= 0.121 af Outflow = 0.75 cfs@ 12.15 hrs, Volume= 0.121 af, Atten= 53%, Lag= 5.6 min Discarded = 0.11 cfs@ 10.85 hrs, Volume= 0.094 af Primary = 0.64 cfs @ 12.15 hrs, Volume= 0.027 af Routed to Pond 5 : Pipes Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 415.26'@ 12.15 hrs Surf.Area= 1,620 sf Storage= 1,140 cf Plug-Flow detention time= 32.6 min calculated for 0.121 af (100% of inflow) Center-of-Mass det. time= 32.6 min ( 772.8 - 740.2 ) Volume Invert Avail.Storage Storage Description #1 413.50' 1,730 cf 60.00'W x 27.00'L x 2.67'H Prismatoid 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 iscarded OutFlow Max=0.11 cfs @ 10.85 hrs HW=413.53' (Free Discharge) 41=Exfiltration (Exfiltration Controls 0.11 cfs) Primary OutFlow Max=0.64 cfs @ 12.15 hrs HW=415.26' (Free Discharge) *_2=Culvert (Barrel Controls 0.64 cfs @ 3.27 fps) 40

1240815-pipes Prepared by Casey & Keller, Inc 512-516 Pleasant Valley Way, West Orange NOAA 24-hr D 100-Year-2020 Rainfall=9. 18", P2=3.47" Printed 8/25/2025 HydroCAD® 10.20-7a_ s/n 03272 © 2025 HydroCAD Software Solutions LLC. Page 34 Pond 3: Pervious Pavers Hydrograph Bi inflow a Outflow Inflow Area=0.168 ac | |B Picay”" Flow (cfs) Time (hours) Peak Elev=415.26' Storage=1,140 cf 04 paanen 0 2 4 6 8 101214 16 18 20 22 24 26 28 30 32 34 3638 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 a

512-516 Pleasant Valley Way, West Orange 1240815-pipes NOAA 24-hr D 100-Year-2020 Rainfall=9. 18", P2=3.47" Prepared by Casey & Keller, Inc Printed 8/25/2025 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC Page 35 Summary for Subcatchment 4: Proposed Runoff = 1.69 cfs@ 12.06 hrs, Volume= 0.123 af, Depth= 7.65" Routed to Pond 5 : Pipes Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. UI as Pervious, Time Span= 0.00-72.00 hrs, dt= 0.05 NOAA 24-hr D 100-Year-2020 Rainfall=9.18", P2=3.47" Area (sf) CN __ Description 3,522 98 Roofs, HSG C 1,136 98 Paved parking, HSG C 3,674 74 »>75% Grass cover, Good, HSG C * 60 98 Areaway 8,392 87 Weighted Average 3,674 74 43.78% Pervious Area 4,718 98 56.22% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) _(ft/sec) (cfs) 0.1 8 0.0650 1.38 Sheet Flow, 1 Smooth surfaces n= 0.011 P2= 3.47" 0.1 15 0.6700 3.99 Sheet Flow, 2 Smooth surfaces n= 0.011 P2= 3.47" 0.5 59 0.0500 1.86 Sheet Flow, 3 Smooth surfaces n= 0.011 P2= 3.47" 0.2 10 0.0250 0.99 Sheet Flow, 4 Smooth surfaces n= 0.011 _P2= 3.47" 0.9 92 Total 42

1240815-pipes Prepared by Casey & Keller, Inc 512-516 Pleasant Valley Way, West Orange NOAA 24-hr D 100-Year-2020 Rainfall=9. 18", P2=3.47" Printed 8/25/2025 HydroCAD® 10.20-7a_s/n 03272 © 2025 HydroCAD Software Solutions LLC Page 36 Subcatchment 4: Proposed Hydrograph Flow (cfs) NOAA 24-hr D 100-Year-2020 Rainfall=9.18" P2=3,47" Runoff Area=8,392 sf Runoff Volume=0.123 af Runoff Depth=7.65" Flow Length=92' Tc=0.9 min CN=74/98 o- sagt y , 1 pias y 0 2 4 6 8 10 12 14 16 18 20 22 24 26 26 30 32 34 36 3B 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) 43

512-516 Pleasant Valley Way, West Orange 1240815-pipes NOAA 24-hr D 100-Year-2020 Rainfall=9.18", P2=3.47" Prepared by Casey & Keller, Inc Printed 8/25/2025 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC Page 37 Summary for Pond 5: Pipes Inflow Area = 0.360 ac, 72.63% Impervious, Inflow Depth = 4.99" for 100-Year-2020 event Inflow = 2.21 cfs@ 12.07 hrs, Volume= 0.150 af Outflow = 1.86 cfs@ 12.15 hrs, Volume= 0.150 af, Atten= 16%, Lag= 4.6 min Discarded = 0.03 cfs@ 7.55 hrs, Volume= 0.045 af Primary = 1.83 cfs@ 12.15 hrs, Volume= 0.105 af Routed to Link 7 : Proposed Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 414.09'@ 12.13 hrs Surf.Area= 400 sf Storage= 641 cf Plug-Flow detention time= 14.9 min calculated for 0.150 af (100% of inflow) Center-of-Mass det. time= 14.9 min ( 773.8 - 758.9 ) Volume Invert Avail.Storage Storage Description #1 411.50' 329 cf 10.00'W x 40.00'L x 3.00'H Prismatoid 1,200 cf Overall - 377 cf Embedded = 823 cf x 40.0% Voids #2 412.00' 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 411.50' 2.900 in/hr Exfiltration over Surface area #2~=~— Primary 412.00' 12.0" Round Culvert L= 14.0' Ke= 0.100 Inlet / Outlet Invert= 412.00'/ 411.94' S= 0.0043 '/ Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 0.79 sf #3 =~ =©Device 2 412.00’ 6.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads #4 ~=Device 2 414.00' 24.0" x 24.0" Horiz. Grate C= 0.600 Limited to weir flow at low heads jiscarded OutFlow Max=0.03 cfs @ 7.55 hrs HW=411.53' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=1.79 cfs @ 12.15 hrs HW=414.07' (Free Discharge) — ulvert (Passes 1.79 cfs of 5.52 cfs potential flow) Favorite (Orifice Controls 1.28 cfs @ 6.50 fps) =Grate (Weir Controls 0.51 cfs @ 0.88 fps) 44

1240815-pipes Prepared by Casey & Keller, Inc 512-516 Pleasant Valley Way, West Orange NOAA 24-hr D 100-Year-2020 Rainfall=9. 18", P2=3.47" Printed 8/25/2025 HydroCAD® 10.20-7a_s/n 03272 © 2025 HydroCAD Software Solutions LLC Page 38 Pond 5: Pipes Hydrograph i Inflow B Outow f Inflow Area=0.360 ac | [Bose Peak Elev=414.09" Storage=641 cf Flow (cfs) —<g Li Time (hours) LMM LLL 0 p ianiaanaaascag 0 2 4 6 B 101214 16 18 20 22 24 26 28 30 32 34 3638 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 7072 45

512-516 Pleasant Valley Way, West Orange 1240815-pipes NOAA 24-hr D 100-Year-2020 Rainfall=9. 18", P2=3.47" Prepared by Casey & Keller, Inc Printed 8/25/2025 HydroCAD® 10.20-7a_s/n 03272 © 2025 HydroCAD Software Solutions LLC Page 39 Summary for Subcatchment 6: Bypass Runoff = 0.09 cfs @ 12.13 hrs, Volume= 0.007 af, Depth= 5.99" Routed to Link 7 : Proposed Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Ul as Pervious, Time Span= 0.00-72.00 hrs, dt= 0.05 NOAA 24-hr D 100-Year-2020 Rainfall=9.18", P2=3.47" Area (sf) CN Description 605 74 _>75% Grass cover, Good, HSG C 605 74 100.00% Pervious Area Tc Length Slope Velocity Capacity Description ) (min) (feet) (fft) (ft/sec) (cfs' 5.9 100 0.0650 0.28 Sheet Flow, 1 Grass: Short n= 0.150 P2= 3.47" 0.1 28 0.0900 4.50 Shallow Concentrated Flow, 2 Grassed Waterway Kv= 15.0 fps 6.0 128 Total Subcatchment 6: Bypass Hydrograph aoe NOAA 24-hr D 0.0854 100-Year-2020 Rainfall=9.18" owe P2=3.47" 0.074 Runoff Area=605 sf Sapeee Runoff Volume=0.007 af $0.0554 Runoff Depth=5.99" ae Flow Length=128' 0.044 Tc=6.0 min CN=74/0 Time (hours) 46

512-516 Pleasant Valley Way, West Orange 1240815-pipes NOAA 24-hr D 100-Year-2020 Rainfall=9. 18", P2=3.47" Printed 8/25/2025 Prepared by Casey & Keller, Inc HydroCAD® 10.20-7a_s/n 03272 © 2025 HydroCAD Software Solutions LLC Page 40 Summary for Link 7: Proposed 0.374 ac, 69.93% Impervious, Inflow Depth= 3.59" for 100-Year-2020 event Inflow Area = inflow = 1.92 cfs@ 12.15 hrs, Volume= 0.112 af Primary = 1.92 cfs@ 12.15 hrs, Volume= 0.112 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 Bi inflow Bi Primary Inflow Area=0.374 ac 24 Flow (cfs) 0+ y 0 2 4 6 B 1012 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 5B 60 62 64 66 68 70 72 Time (hours) 47

512-516 Pleasant Valley Way, West Orange 1240815-pipes Water Quality Storm Water Quality Rainfall=1.25", P2=3.47" Prepared by Casey & Keller, Inc Printed 8/25/2025 HydroCAD® 10.20-7a_s/n 03272 © 2025 HydroCAD Software Solutions LLC Page 41 Time span=0.00-72.00 hrs, dt=0.05 hrs, 1441 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. UI as Pervious Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment1: Exisiting Runoff Area=16,242 sf 68.64% Impervious Runoff Depth=0.73" Flow Length=141' Tc=5.9 min CN=74/98 Runoff=0.73 cfs 0.023 af Subcatchment2: Parking Lot Runoff Area=7,305 sf 91.47% Impervious Runoff Depth=0.95" Flow Length=92' Tc=0.9 min CN=74/98 Runoff=0.47 cfs 0.013 af Pond 3: Pervious Pavers Peak Elev=413.90' Storage=257 cf Inflow=0.47 cfs 0.013 af Discarded=0.11 cfs 0.013 af Primary=0.00 cfs 0.000 af Outflow=0.11 cfs 0.013 af Subcatchment4: Proposed Runoff Area=8,392 sf 56.22% Impervious Runoff Depth=0.61" Flow Length=92' Tc=0.9 min CN=74/98 Runoff=0.33 cfs 0.010 af Pond 5: Pipes Peak Elev=412.30' Storage=145 cf Inflow=0.33 cfs 0.010 af Discarded=0.03 cfs 0.005 af Primary=0.23 cfs 0.005 af Outflow=0.26 cfs 0.010 af Subcatchment6: Bypass Runoff Area=605 sf 0.00% Impervious Runoff Depth=0.07" Flow Length=128' Tc=6.0 min CN=74/0 Runoff=0.00 cfs 0.000 af Link 7: Proposed Inflow=0.23 cfs 0.005 af Primary=0.23 cfs 0.005 af Total Runoff Area = 0.747 ac Runoff Volume = 0.046 af Average Runoff Depth = 0.74" 30.71% Pervious = 0.229 ac 69.29% Impervious = 0.518 ac 48