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 Page 12 Pond 5: Pipes Hydrograph Bi Inflow Outflow ( Inflow Area=0.360 ac | |B piceve’ ae Peak Elev=412.44' * —_ Storage=183 cf 0.454 044 0.354 0.34 Flow (cfs) 0284 024 0.154 0.14 [ SZ wa CLLULLLULLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLILLLLIL 0. a a : , 0 2 4 6 B 10121416 18 20 22 24 26 28 30 32 34.36 38 40 42 44 46.48 50 52 54 56 58 60 62 64 6568 7072 Time (hours) 19

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 13 Summary for Subcatchment 6: Bypass Runoff = 0.02 cfs@ 12.14 hrs, Volume= 0.001 af, Depth= 1.22" Routed to Link 7 : Proposed 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 605 74 _>75% Grass cover, Good, HSG C 605 74 100.00% Pervious Area Te Length Slope Velocity Capacity Description (min) (feet) (ft/ft)__ (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 “02 ot NOAA 24-hr D 0.017 2-Year-2020 Rainfall=3.47" ors P2=3.47" tonal Runoff Area=605 sf Z 00124 Runoff Volume=0.001 af 3 oot, Runoff Depth=1.22" ~ hes Flow Length=128" peak Tc=6.0 min ° 0.005: CN=74/0 0.0044 0,003: 0.0024 0.001 0 2 4 & 8B 10 1214 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) 20

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 14 Summary for Link 7: Proposed Inflow Area = 0.374 ac, 69.93% Impervious, Inflow Depth= 0.49" for 2-Year-2020 event Inflow = 0.43 cfs@ 12.10 hrs, Volume= 0.015 af Primary = 0.43 cfs@ 12.10 hrs, Volume= 0.015 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 WB Inflow Primary Inflow Area=0.374 ac Flow (cfs) 0 ; . Lk - 0 2 4 6 8B 10 1214 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) 21

512-516 Pleasant Valley Way, West Orange 1240815-pipes NOAA 24-hr D 10-Year-2020 Rainfall=5.38", 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 15 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=4.37" Flow Length=141' Tc=5.9 min CN=74/98 Runoff=1.63 cfs 0.136 af Subcatchment2: Parking Lot Runoff Area=7,305 sf 91.47% Impervious Runoff Depth=4.93" Flow Length=92' Tc=0.9 min CN=74/98 Runoff=0.92 cfs 0.069 af Pond 3: Pervious Pavers Peak Elev=414.63' Storage=733 cf Inflow=0.92 cfs 0.069 af Discarded=0.11 cfs 0.067 af Primary=0.05 cfs 0.002 af Outflow=0.16 cfs 0.069 af Subcatchment4: Proposed Runoff Area=8,392 sf 56.22% Impervious Runoff Depth=4.06" Flow Length=92' Tc=0.9 min CN=74/98 Runoff=0.91 cfs 0.065 af Pond 5: Pipes Peak Elev=412.74' Storage=268 cf Inflow=0.91 cfs 0.067 af Discarded=0.03 cfs 0.033 af Primary=0.66 cfs 0.034 af Outflow=0.69 cfs 0.067 af Subcatchment6é: Bypass Runoff Area=605 sf 0.00% Impervious Runoff Depth=2.67" Flow Length=128' Tc=6.0 min CN=74/0 Runoff=0.04 cfs 0.003 af Link 7: Proposed Inflow=0.70 cfs 0.037 af Primary=0.70 cfs 0.037 af Total Runoff Area = 0.747 ac Runoff Volume = 0.273 af Average Runoff Depth = 4.38" 30.71% Pervious = 0.229 ac 69.29% Impervious = 0.518 ac 22

512-516 Pleasant Valley Way, West Orange 1240815-pipes NOAA 24-hr D 10-Year-2020 Rainfall=5.38", 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 16 Summary for Subcatchment 1: Exisiting Runoff = 1.63 cfs@ 12.13 hrs, Volume= 0.136 af, Depth= 4.37" 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 10-Year-2020 Rainfall=5.38", P2=3.47" Area (sf) CN__Description 2,676 98 Buildings 7 794 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 Tc Length Slope Velocity Capacity Description (min) (feet) (fft)__(fl/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 23

1240815-pipes Prepared by Casey & Keller, Inc 512-516 Pleasant Valley Way, West Orange NOAA 24-hr D 10-Year-2020 Rainfall=5.38", P2=3.47" Printed 8/25/2025 HydroCAD® 10.20-7a_s/n 03272 © 2025 HydroCAD Software Solutions LLC Page 17 Subcatchment 1: Exisiting Hydrograph Flow (cfs) Time (hours) 10-Year-2020 Rainfall=5.38" oe aD or r vige viapia 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 6870 72 NOAA 24-hr D P2=3.47" Runoff Area=16,242 sf Runoff Volume=0.136 af Runoff Depth=4.37" Flow Length=141' Tc=5.9 min CN=74/98 24

512-516 Pleasant Valley Way, West Orange 1240815-pipes NOAA 24-hr D 10-Year-2020 Rainfall=5.38", 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 18 Summary for Subcatchment 2: Parking Lot Runoff = 0.92 cfs@ 12.06 hrs, Volume= 0.069 af, Depth= 4.93" 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 10-Year-2020 Rainfall=5.38", P2=3.47" Area (sf) CN ___ Description 6,682 98 Paved parking, HSG C 62374 ~~ >75% Grass cover, Good, HSG C 7,305 96 Weighted Average 623 74 8.53% Pervious Area 6,682 98 91.47% Impervious Area Tc Length Slope Velocity Capacity Description (min) _(feet) (f/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 25

512-516 Pleasant Valley Way, West Orange 1240815-pipes NOAA 24-hr D 10-Year-2020 Rainfall=5.38", 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 19 Subcatchment 2: Parking Lot Hydrograph NOAA 24-hr D 10-Year-2020 Rainfall=5.38" P2=3.47" Runoff Area=7,305 sf Runoff Volume=0.069 af Runoff Depth=4.93" Flow Length=92' Tc=0.9 min CN=74/98 Flow (cfs) 0 aan - 4 < , 0 2 4 & & 101214 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) 26

512-516 Pleasant Valley Way, West Orange 1240815-pipes NOAA 24-hr D 10-Year-2020 Rainfall=5.38", 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 20 Summary for Pond 3: Pervious Pavers Inflow Area = 0.168 ac, 91.47% Impervious, Inflow Depth= 4.93" for 10-Year-2020 event Inflow = 0.92 cfs @ 12.06 hrs, Volume= 0.069 af Outflow = 0.16 cfs @ 12.47 hrs, Volume= 0.069 af, Atten= 83%, Lag= 24.5 min Discarded = 0.11 cfs@ 11.45 hrs, Volume= 0.067 af Primary = 0.05 cfs @ 12.47 hrs, Volume= 0.002 af Routed to Pond 5 : Pipes Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 414.63' @ 12.47 hrs Surf.Area= 1,620 sf Storage= 733 cf Plug-Flow detention time= 36.2 min calculated for 0.069 af (100% of inflow) Center-of-Mass det. time= 36.2 min ( 784.0 - 747.7 ) 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 @ 11.45 hrs HW=413.53' (Free Discharge) 4=Exfiltration (Exfiltration Controls 0.11 cfs) Primary OutFlow Max=0.05 cfs @ 12.47 hrs HW=414.63' (Free Discharge) *_2=Culvert (Barrel Controls 0.05 cfs @ 1.76 fps) 27

512-516 Pleasant Valley Way, West Orange 1240815-pipes Prepared by Casey & Keller, Inc NOAA 24-hr D 10-Year-2020 Rainfall=5.38", P2=3.47" Printed 8/25/2025 HydroCAD® 10.20-7a_s/n 03272 © 2025 HydroCAD Software Solutions LLC Page 21 Pond 3: Pervious Pavers Hydrograph Bi inflow Outflow Inflow Area=0.168 ac | |B pcre Peak Elev=414.63' Storage=733 cf Flow (cfs) 0 i pipaniaipnaianiinian igs a gaa i y y 0 2 4 6 8B 101214 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) 28