Stormwater Management Report Feb 2026 resubmissionrcd 2 26 2026

2026-02 Proposed Conditions - NOAA 24-hr D 100-Year-Projected Rainfall=11.52", P2=4.09" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 60 Pond 2P: BIO BASIN Hydrograph Inflow 1.59 cfs Primary Inflow Area=0.140 ac Peak Elev=623.69' 1.07 cfs Storage=938 cf Flow (cfs) 1 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)

2026-02 Proposed Conditions - NOAA 24-hr D 100-Year-Projected Rainfall=11.52", P2=4.09" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 61 Summary for Link 2L: POI #1 Inflow Area = 0.637 ac, 68.48% Impervious, Inflow Depth = 10.39" for 100-Year-Projected event Inflow = 6.40 cfs @ 12.11 hrs, Volume= 0.551 af Primary = 6.40 cfs @ 12.11 hrs, Volume= 0.551 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs Link 2L: POI #1 Hydrograph Inflow 6.40 cfs Primary 7 6.40 cfs Inflow Area=0.637 ac 6 5 Flow (cfs) 4 3 2 1 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)

WATER QUALITY CALCULATIONS

6S PDA #1 - Impervious to Bio 2P 7S BIO BASIN PDA #1 - Pervious to Bio Subcat Reach Pond Link Routing Diagram for 2026-02 Proposed Conditions - AJH Prepared by Dynamic Engineering, Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC

2026-02 Proposed Conditions - AJH NJ DEP 2-hr WQ Rainfall=1.25", P2=4.09" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 2 Summary for Subcatchment 6S: PDA #1 - Impervious to Bio Runoff = 0.28 cfs @ 1.08 hrs, Volume= 0.008 af, Depth= 1.03" Routed to Pond 2P : BIO BASIN Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs NJ DEP 2-hr WQ Rainfall=1.25", P2=4.09" Area (sf) CN Description 3,921 98 Paved parking, HSG B 3,921 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.4 42 0.0326 1.59 Sheet Flow, A-B Smooth surfaces n= 0.011 P2= 4.09" 0.1 18 0.1180 5.53 Shallow Concentrated Flow, B-C (RIP-RAP) Unpaved Kv= 16.1 fps 0.5 60 Total Subcatchment 6S: PDA #1 - Impervious to Bio Hydrograph Runoff 0.30.28 cfs 0.28 NJ DEP 2-hr 0.26 0.24 WQ Rainfall=1.25" 0.22 P2=4.09" 0.2 Runoff Area=3,921 sf 0.18 Flow (cfs) 0.16 Runoff Volume=0.008 af 0.14 Runoff

0.16 Runoff Volume=0.008 af 0.14 Runoff Depth=1.03" 0.12 Flow Length=60' 0.1 0.08 Tc=0.5 min 0.06 CN=98 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)

2026-02 Proposed Conditions - AJH NJ DEP 2-hr WQ Rainfall=1.25", P2=4.09" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 3 Summary for Subcatchment 7S: PDA #1 - Pervious to Bio Runoff = 0.03 cfs @ 1.13 hrs, Volume= 0.001 af, Depth= 0.17" Routed to Pond 2P : BIO BASIN Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs NJ DEP 2-hr WQ Rainfall=1.25", P2=4.09" Area (sf) CN Description 2,178 80 >75% Grass cover, Good, HSG D 2,178 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.8 45 0.0450 0.16 Sheet Flow, A-B Grass: Dense n= 0.240 P2= 4.09" 0.2 29 0.0148 2.47 Shallow Concentrated Flow, B-C Paved Kv= 20.3 fps 0.1 18 0.1180 5.53 Shallow Concentrated Flow, C-D (RIP-RAP) Unpaved Kv= 16.1 fps 5.1 92 Total Subcatchment 7S: PDA #1 - Pervious to Bio Hydrograph Runoff 0.03 cfs 0.028 0.026 NJ DEP 2-hr 0.024 WQ Rainfall=1.25" 0.022 0.02 P2=4.09" 0.018 Runoff Area=2,178 sf Flow (cfs) 0.016

P2=4.09" 0.018 Runoff Area=2,178 sf Flow (cfs) 0.016 Runoff Volume=0.001 af 0.014 Runoff Depth=0.17" 0.012 0.01 Flow Length=92' 0.008 Tc=5.1 min 0.006 CN=80 0.004 0.002 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)

2026-02 Proposed Conditions - AJH NJ DEP 2-hr WQ Rainfall=1.25", P2=4.09" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 4 Summary for Pond 2P: BIO BASIN Inflow Area = 0.140 ac, 64.29% Impervious, Inflow Depth = 0.73" for WQ event Inflow = 0.30 cfs @ 1.08 hrs, Volume= 0.008 af Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 100%, Lag= 0.0 min Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs Peak Elev= 622.86' @ 2.29 hrs Surf.Area= 540 sf Storage= 369 cf Plug-Flow detention time= (not calculated: initial storage exceeds outflow) Center-of-Mass det. time= (not calculated: no outflow) Volume Invert Avail.Storage Storage Description #1 622.00' 1,219 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 622.00 323 0 0 623.00 577 450 450 624.00 960 769 1,219 Device Routing Invert Outlet Devices #1 Primary 619.11' 15.0" Round Culvert L= 35.0' RCP, rounded edge headwall, Ke= 0.100 Inlet / Outlet Invert= 619.11' / 618.93' S= 0.0051 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.23 sf #2 Device 1 622.86' 0.6' long Sharp-Crested Rectangular Weir 2 End Contraction(s) #3 Device 1 623.70' 48.0" x 48.0" Horiz. Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=622.00' (Free Discharge) 1=Culvert (Passes 0.00 cfs of 9.60 cfs potential flow) 2=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) 3=Grate ( Controls 0.00 cfs)

2026-02 Proposed Conditions - AJH NJ DEP 2-hr WQ Rainfall=1.25", P2=4.09" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 5 Pond 2P: BIO BASIN Hydrograph Inflow 0.30 cfs Primary 0.32 0.3 Inflow Area=0.140 ac 0.28 0.26 Peak Elev=622.86' 0.24 Storage=369 cf 0.22 0.2 Flow (cfs) 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.00 cfs 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)