Stormwater Report

512-516 Pleasant Valley Way, West Orange 1240815-pipes NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Casey & Keller, Inc Printed 8/25/2025 HydroCAD® 10.20-7a_s/n 03272 © 2025 HydroCAD Software Solutions LLC Paae 2 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=2.60" Flow Length=141' Tc=5.9 min CN=74/98 Runoff=0.98 cfs 0.081 af Subcatchment2: Parking Lot Runoff Area=7,305 sf 91.47% Impervious Runoff Depth=3.06" Flow Length=92' Tc=0.9 min CN=74/98 Runoff=0.58 cfs 0.043 af Pond 3: Pervious Pavers Peak Elev=414.05' Storage=358 cf Inflow=0.58 cfs 0.043 af Discarded=0.11 cfs 0.043 af Primary=0.00 cfs 0.000 af Outflow=0.11 cfs 0.043 af Subcatchment4: Proposed Runoff Area=8,392 sf 56.22% Impervious Runoff Depth=2.35" Flow Length=92' Tc=0.9 min CN=74/98 Runoff=0.52 cfs 0.038 af Pond 5: Pipes Peak Elev=412.44' Storage=183 cf Inflow=0.52 cfs 0.038 af Discarded=0.03 cfs 0.024 af Primary=0.41 cfs 0.014 af Outflow=0.44 cfs 0.038 af Subcatchmenté6: Bypass Runoff Area=605 sf 0.00% Impervious Runoff Depth=1.22" Flow Length=128' Tc=6.0 min CN=74/0 Runoff=0.02 cfs 0.001 af Link 7: Proposed Inflow=0.43 cfs 0.015 af Primary=0.43 cfs 0.015 af Total Runoff Area = 0.747 ac Runoff Volume = 0.163 af Average Runoff Depth = 2.62" 30.71% Pervious = 0.229 ac 69.29% Impervious = 0.518 ac

512-516 Pleasant Valley Way, West Orange 1240815-pipes NOAA 24-hr D 2-Year-2020 Rainfall=3.47", 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 3 Summary for Subcatchment 1: Exisiting Runoff = 0.98 cfs @ 12.13 hrs, Volume= 0.081 af, Depth= 2.60" 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 2-Year-2020 Rainfall=3.47", P2=3.47" Area (sf) CN Description 2,676 98 Buildings * 794 98 Walks/Steps & Patio 7,679 98 Paved parking, HSG C 5,093 74 __>75% Grass cover, Good, HSG C 16,242 90 Weighted Average 5,093 74 31.36% Pervious Area 11,149 98 68.64% Impervious Area Te Length Slope Velocity Capacity Description s (min) (feet) (f/ft) (ft/sec) (cfs) 41 66 0.0680 0.27 Sheet Flow, 1 Grass: Short n= 0.150 P2= 3.47" 1.4 21 0.0950 0.24 Sheet Flow, 2 Grass: Short n=0.150 P2= 3.47" 0.2 13 0.0390 1.24 Sheet Flow, 3 Smooth surfaces n= 0.011 P2= 3.47" 0.1 13 0.0390 4.01 Shallow Concentrated Flow, 4 Paved Kv= 20.3 fps 0.1 28 0.0360 3.85 Shallow Concentrated Flow, 5 Paved Kv= 20.3 fps 5.9 141 Total 10

1240815-pipes Prepared by Casey & Keller, Inc 512-516 Pleasant Valley Way, West Orange NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Printed 8/25/2025 HydroCAD® 10.20-7a_s/n 03272 © 2025 HydroCAD Software Solutions LLC Page 4 Subcatchment 1: Exisiting Hydrograph Flow (cfs) 0 Sap Dias agaagal y y y 0 2 4 6 8B 10 1214 16 18 20 22 24 26 28 30 32 54 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) 2-Year-2020 Rainfall=3.47" Runoff Area=16,242 sf Runoff Volume=0.081 af NOAA 24-hr D P2=3.47" Runoff Depth=2.60" Flow Length=141'" Tc=5.9 min CN=74/98 11

512-516 Pleasant Valley Way, West Orange 1240815-pipes NOAA 24-hr D 2-Year-2020 Rainfall=3.47", 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 5 Summary for Subcatchment 2: Parking Lot Runoff = 0.58 cfs @ 12.06 hrs, Volume= 0.043 af, Depth= 3.06” Routed to Pond 3 : Pervious Pavers 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 2-Year-2020 Rainfall=3.47", P2=3.47" Area (sf) CN __ Description 6,682 98 Paved parking, HSG C 623 74 ~>75% Grass cover, Good, HSG C 7,305 96 Weighted Average 623 74 8.53% Pervious Area 6,682 98 91.47% Impervious Area Te Length Slope Velocity Capacity Description (min) _(feet) (fi/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 12

512-516 Pleasant Valley Way, West Orange 1240815-pipes NOAA 24-hr D 2-Year-2020 Rainfall=3.47", 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 6 Subcatchment 2: Parking Lot Hydrograph os] NOAA 24-hr D 2-Year-2020 Rainfall=3.47" P2=3.47" Runoff Area=7,305 sf Runoff Volume=0.043 af Runoff Depth=3.06" Flow Length=92' Tc=0.9 min CN=74/98 0.554 054 0.454 0.44 0.354 0.34 Flow (cfs) 0.254 0.24 0.154 014 0.054 o4 Fr r r ‘ ways 0 2 4 6 8 10 1214 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) 13

512-516 Pleasant Valley Way, West Orange 1240815-pipes NOAA 24-hr D 2-Year-2020 Rainfall=3.47", 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 7 Summary for Pond 3: Pervious Pavers Inflow Area = 0.168 ac, 91.47% Impervious, Inflow Depth = 3.06" for 2-Year-2020 event Inflow = 0.58 cfs @ 12.06 hrs, Volume= 0.043 af Outflow = 0.11 cfs@ 11.75 hrs, Volume= 0.043 af, Atten= 81%, Lag= 0.0 min Discarded = 0.11 cfs@ 11.75 hrs, Volume= 0.043 af Primary = 0.00 cfs@ 0.00hrs, 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= 414.05' @ 12.37 hrs Surf.Area= 1,620 sf Storage= 358 cf Plug-Flow detention time= 17.0 min calculated for 0.043 af (100% of inflow) Center-of-Mass det. time= 17.0 min ( 772.7 - 755.6 ) 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 jiscarded OutFlow Max=0.11 cfs @ 11.75 hrs HW=413.53' (Free Discharge) 41=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) 14

512-516 Pleasant Valley Way, West Orange 1240815-pipes NOAA 24-hr D 2-Year-2020 Rainfall=3.47", 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 8 Pond 3: Pervious Pavers Hydrograph Inflow Outiow Inflow Area=0.168 ac | |B2s2: 06 Peak Elev=414.05' oss Storage=358 cf 0 y 9 y 0 2 4 6 B 1012 1416 18 20 22 2426 28 30 32 34.36 38 40 42 44 46.46 50 52 54 5658 60 62 64 6668 7072 Time (hours)

512-516 Pleasant Valley Way, West Orange 1240815-pipes NOAA 24-hr D 2-Year-2020 Rainfall=3.47", 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 9 Summary for Subcatchment 4: Proposed Runoff = 0.52 cfs@ 12.06 hrs, Volume= 0.038 af, Depth= 2.35" 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 2-Year-2020 Rainfall=3.47", 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 ia 60 98 Areaway 8,392 87 Weighted Average 3,674 74 43.78% Pervious Area 4,718 98 56.22% Impervious Area Te Length Slope Velocity Capacity Description (min) (feet) (fU/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 16

512-516 Pleasant Valley Way, West Orange 1240815-pipes NOAA 24-hr D 2-Year-2020 Rainfall=3.47", 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 10 Subcatchment 4: Proposed Hydrograph 0.55: NOAA 24-hr D 2-Year-2020 Rainfall=3.47" P2=3.47" Runoff Area=8,392 sf Runoff Volume=0.038 af 0.5 0.454 044 0.354 : a Runoff Depth=2.35" * os] Flow Length=92' 024 Tc=0.9 min 0.184 CN=74/98 0.4 0.05 4 6 8 10 1214 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 56 60 62 64 66 68 70 72 Time (hours) ot 02 17

512-516 Pleasant Valley Way, West Orange 1240815-pipes NOAA 24-hr D 2-Year-2020 Rainfall=3.47", 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 11 Summary for Pond 5: Pipes Inflow Area = 0.360 ac, 72.63% Impervious, Inflow Depth= 1.26" for 2-Year-2020 event Inflow = 0.52 cfs @ 12.06 hrs, Volume= 0.038 af Outflow = 0.44 cfs@ 12.10 hrs, Volume= 0.038 af, Atten= 16%, Lag= 2.3 min Discarded = 0.03 cfs @ 10.80 hrs, Volume= 0.024 af Primary = 0.41 cfs@ 12.10 hrs, Volume= 0.014 af Routed to Link 7 : Proposed Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 412.44'@ 12.10 hrs Surf.Area= 400 sf Storage= 183 cf Plug-Flow detention time= 15.6 min calculated for 0.038 af (100% of inflow) Center-of-Mass det. time= 15.6 min ( 793.1 - 777.5 ) Volume Invert Avail.Storage _ Storage Description cal 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 ~Device2 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 iscarded OutFlow Max=0.03 cfs @ 10.80 hrs HW=411.53' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=0.41 cfs @ 12.10 hrs HW=412.44' (Free Discharge) *_2=Culvert (Passes 0.41 cfs of 0.58 cfs potential flow) fi eneee (Orifice Controls 0.41 cfs @ 2.26 fps) =Grate ( Controls 0.00 cfs) 18