Stormwater Management Report Feb 2026 resubmissionrcd 2 26 2026

2026-02 Proposed Conditions - AJHNOAA 24-hr D 2-Year-Projected Rainfall=4.09", P2=4.09" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 20 Pond 2P: BIO BASIN Hydrograph Inflow 0.51 cfs Primary 0.55 0.5 Inflow Area=0.140 ac 0.45 Peak Elev=623.20' 0.4 0.35 cfs Storage=574 cf 0.35 Flow (cfs) 0.3 0.25 0.2 0.15 0.1 0.05 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 - AJHNOAA 24-hr D 2-Year-Projected Rainfall=4.09", P2=4.09" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 21 Summary for Link 2L: POI #1 Inflow Area = 0.637 ac, 68.48% Impervious, Inflow Depth = 3.15" for 2-Year-Projected event Inflow = 1.85 cfs @ 12.11 hrs, Volume= 0.167 af Primary = 1.85 cfs @ 12.11 hrs, Volume= 0.167 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 1.85 cfs Primary 2 1.85 cfs Inflow Area=0.637 ac 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 - AJH NOAA 24-hr D 10-Year-Current Rainfall=5.38", P2=3.47" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 22 Summary for Subcatchment 3S: Proposed Roof Runoff = 0.80 cfs @ 12.10 hrs, Volume= 0.061 af, Depth= 5.14" Routed to Pond 1P : UG BASIN Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs NOAA 24-hr D 10-Year-Current Rainfall=5.38", P2=3.47" Area (sf) CN Description 6,205 98 Roofs, HSG B 6,205 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Subcatchment 3S: Proposed Roof Hydrograph 0.9 Runoff 0.85 0.80 cfs 0.8 NOAA 24-hr D 0.75 10-Year-Current Rainfall=5.38" 0.7 0.65 P2=3.47" 0.6 Runoff Area=6,205 sf 0.55 Runoff Volume=0.061 af Flow (cfs) 0.5 Runoff Depth=5.14" 0.45 Tc=1.0 min

Runoff Depth=5.14" 0.45 Tc=1.0 min 0.4 0.35 CN=98 0.3 0.25 0.2 0.15 0.1 0.05 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 NOAA 24-hr D 10-Year-Current Rainfall=5.38", P2=3.47" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 23 Summary for Subcatchment 4S: PDA #1 - Undetained Impervious Runoff = 1.15 cfs @ 12.10 hrs, Volume= 0.087 af, Depth= 5.14" Routed to Link 2L : POI #1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs NOAA 24-hr D 10-Year-Current Rainfall=5.38", P2=3.47" Area (sf) CN Description 8,866 98 Paved parking, HSG D 8,866 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.1 93 0.0188 1.38 Sheet Flow, A-B Smooth surfaces n= 0.011 P2= 3.47" 1.0 326 0.0115 5.64 6.93 Pipe Channel, B-C 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 Corrugated PE, smooth interior 2.1 419 Total Subcatchment 4S: PDA #1 - Undetained Impervious Hydrograph Runoff 1.15 cfs NOAA 24-hr D 10-Year-Current Rainfall=5.38" 1 P2=3.47" Runoff Area=8,866 sf Runoff Volume=0.087 af Flow (cfs)

Runoff Volume=0.087 af Flow (cfs) Runoff Depth=5.14" Flow Length=419' Tc=2.1 min CN=98 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 NOAA 24-hr D 10-Year-Current Rainfall=5.38", P2=3.47" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 24 Summary for Subcatchment 5S: PDA #1 - Undetained Pervious Runoff = 0.58 cfs @ 12.13 hrs, Volume= 0.041 af, Depth= 3.23" Routed to Link 2L : POI #1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs NOAA 24-hr D 10-Year-Current Rainfall=5.38", P2=3.47" Area (sf) CN Description 6,562 80 >75% Grass cover, Good, HSG D 6,562 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.8 20 0.0200 0.09 Sheet Flow, A-B Grass: Dense n= 0.240 P2= 3.47" 0.5 35 0.0200 1.16 Sheet Flow, B-C Smooth surfaces n= 0.011 P2= 3.47" 1.0 326 0.0115 5.64 6.93 Pipe Channel, C-D 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 Corrugated PE, smooth interior 5.3 381 Total Subcatchment 5S: PDA #1 - Undetained Pervious Hydrograph 0.65 Runoff 0.58 cfs 0.6 NOAA 24-hr D 0.55 10-Year-Current Rainfall=5.38" 0.5 P2=3.47" 0.45 Runoff Area=6,562 sf

P2=3.47" 0.45 Runoff Area=6,562 sf 0.4 Runoff Volume=0.041 af Flow (cfs) 0.35 Runoff Depth=3.23" 0.3 Flow Length=381' Tc=5.3 min 0.25 CN=80 0.2 0.15 0.1 0.05 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 NOAA 24-hr D 10-Year-Current Rainfall=5.38", P2=3.47" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 25 Summary for Subcatchment 6S: PDA #1 - Impervious to Bio Runoff = 0.51 cfs @ 12.10 hrs, Volume= 0.039 af, Depth= 5.14" 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 NOAA 24-hr D 10-Year-Current Rainfall=5.38", P2=3.47" 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) 0.5 42 0.0326 1.46 Sheet Flow, A-B Smooth surfaces n= 0.011 P2= 3.47" 0.1 18 0.1180 5.53 Shallow Concentrated Flow, B-C (RIP-RAP) Unpaved Kv= 16.1 fps 0.6 60 Total Subcatchment 6S: PDA #1 - Impervious to Bio Hydrograph 0.55 Runoff 0.51 cfs 0.5 NOAA 24-hr D 0.45 10-Year-Current Rainfall=5.38" P2=3.47" 0.4 Runoff Area=3,921 sf 0.35 Runoff Volume=0.039 af Flow (cfs) 0.3 Runoff

Runoff Volume=0.039 af Flow (cfs) 0.3 Runoff Depth=5.14" Flow Length=60' 0.25 Tc=0.6 min 0.2 CN=98 0.15 0.1 0.05 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)