Stormwater Report

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 42 Summary for Subcatchment 1: Exisiting Runoff = 0.73 cfs@ 1.14hrs, Volume= 0.023 af, Depth= 0.73" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. UI as Pervious, Time Span= 0.00-72.00 hrs, dt= 0.05 Water Quality Storm Water Quality Rainfall=1.25", P2=3.47" Area (sf) CN Description 2,676 98 Buildings i 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) (fU/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 49

1240815-pipes Prepared by Casey & Keller, Inc 512-516 Pleasant Valley Way, West Orange Water Quality Storm Water Quality Rainfall=1.25", P2=3.47" Printed 8/25/2025 HydroCAD® 10.20-7a_ s/n 03272 © 2025 HydroCAD Software Solutions LLC Page 43 Flow (cfs) Subcatchment 1: Exisiting Hydrograph 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 58 60 62 64 66 6B 7072 Water Quality Storm Water Quality Rainfall=1.25" P2=3,47" Runoff Area=16,242 sf Runoff Volume=0.023 af Runoff Depth=0.73" Flow Length=141' Tc=5.9 min CN=74/98 Time (hours) 50

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 44 Summary for Subcatchment 2: Parking Lot Runoff = 0.47 cfs@ 1.07 hrs, Volume= 0.013 af, Depth= 0.95" 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 Water Quality Storm Water Quality Rainfall=1.25", 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) (f/ft) _(f/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 51

1240815-pipes Prepared by Casey & Keller, Inc 512-516 Pleasant Valley Way, West Orange HydroCAD® 10.20-7a_s/n 03272 © 2025 HydroCAD Software Solutions LLC Water Quality Storm Water Quality Rainfall=1.25", P2=3.47" Printed 8/25/2025 Page 45 Flow (cfs) Subcatchment 2: Parking Lot Hydrograph 46 Water Quality Storm ; Water Quality Rainfall=1.25" ose] P2=3.47" 034 Runoff Area=7,305 sf os Runoff Volume=0.013 af 9264 Runoff Depth=0.95" 0224 Flow Length=92' 0.18 Tc=0.9 min 0.144 CN=74/98 0.124 014 0.084 0.064 0.044 0.024 0 2 4 6 8B 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 7072 Time (hours) 52

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 46 Summary for Pond 3: Pervious Pavers Inflow Area = 0.168 ac, 91.47% Impervious, Inflow Depth = 0.95" for Water Quality event Inflow = 0.47 cfs@ 1.07 hrs, Volume= 0.013 af Outflow = 0.11 cfs@ 0.95hrs, Volume= 0.013 af, Atten= 77%, Lag= 0.0 min Discarded = 0.11 cfs@ 0.95hrs, 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= 257 cf Plug-Flow detention time= 21.6 min calculated for 0.013 af (100% of inflow) Center-of-Mass det. time= 21.6 min ( 89.6 - 68.0 ) 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 @ 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) 53

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 47 Pond 3: Pervious Pavers Hydrograph Bi Inflow Outflow Inflow Area=0.168 ac | |B2szes Peak Elev=413.90" a Storage=257 cf 2 4 6 B 10121416 18 20 22 2426 26 30 32 34.36 38 40 42 44 46.48 50 52 54 56.58 60 62 64 6668 70 72 Time (hours) 54

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 48 Summary for Subcatchment 4: Proposed Runoff = 0.33 cfs@ 1.07 hrs, Volume= 0.010 af, Depth= 0.61" 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 Water Quality Storm Water Quality Rainfall=1.25", 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 al 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 55

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 49 Subcatchment 4: Proposed Hydrograph Water Quality Storm Water Quality Rainfall=1.25" P2=3.47" Runoff Area=8,392 sf Runoff Volume=0.010 af Runoff Depth=0.61" Flow Length=92" Tc=0.9 min CN=74/98 Flow (cfs) 0 2 4 6 B 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 65 6B 7072 Time (hours) 56

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 50 Summary for Pond 5: Pipes Inflow Area = 0.360 ac, 72.63% Impervious, Inflow Depth= 0.33" for Water Quality event Inflow = 0.33 cfs @ 1.07 hrs, Volume= 0.010 af Outflow = 0.26cfs@ 1.14 hrs, Volume= 0.010 af, Atten= 22%, Lag= 4.2 min Discarded = 0.03 cfs @ 0.80 hrs, Volume= 0.005 af Primary = 0.23 cfs@ 1.14 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= 412.30'@ 1.14 hrs Surf.Area= 400 sf Storage= 145 cf Plug-Flow detention time= 19.9 min calculated for 0.010 af (100% of inflow) Center-of-Mass det. time= 19.9 min ( 88.7 - 68.8 ) 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 @ 0.80 hrs HW=411.54' (Free Discharge) 4=Exfiltration (Exfiltration Controls 0.03 cfs) Rrimary OutFlow Max=0.22 cfs @ 1.14 hrs HW=412.30' (Free Discharge) ulvert (Passes 0.22 cfs of 0.27 cfs potential flow) 3=Orifice (Orifice Controls 0.22 cfs @ 1.85 fps) =Grate ( Controls 0.00 cfs) 57

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 51 Pond 5: Pipes Hydrograph Bi Inflow © Outflow sand Inflow Area=0.360 ac | [Bpccc? : Peak Elev=412.30' Storage=145 cf Flow (cfs) Time (hours) 58