Stormwater Management Report Feb 2026 resubmissionrcd 2 26 2026

2026-02 Proposed Conditions - AJ NOAA 24-hr D 10-Year-Projected Rainfall=6.37", P2=4.09" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 40 Pond 2P: BIO BASIN Hydrograph Inflow 0.84 cfs Primary 0.9 0.85 Inflow Area=0.140 ac 0.8 0.75 Peak Elev=623.36' 0.7 0.65 0.58 cfs Storage=685 cf 0.6 0.55 Flow (cfs) 0.5 0.45 0.4 0.35 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 - AJ NOAA 24-hr D 10-Year-Projected Rainfall=6.37", P2=4.09" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 41 Summary for Link 2L: POI #1 Inflow Area = 0.637 ac, 68.48% Impervious, Inflow Depth = 5.34" for 10-Year-Projected event Inflow = 3.00 cfs @ 12.11 hrs, Volume= 0.283 af Primary = 3.00 cfs @ 12.11 hrs, Volume= 0.283 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 3.00 cfs Primary 3.00 cfs 3 Inflow Area=0.637 ac 2 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 - AJ NOAA 24-hr D 100-Year-Current Rainfall=9.18", P2=3.47" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 42 Summary for Subcatchment 3S: Proposed Roof Runoff = 1.37 cfs @ 12.10 hrs, Volume= 0.106 af, Depth= 8.94" 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 100-Year-Current Rainfall=9.18", 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 Runoff 1.37 cfs NOAA 24-hr D 100-Year-Current Rainfall=9.18" P2=3.47" Runoff Area=6,205 sf 1 Runoff Volume=0.106 af Flow (cfs) Runoff Depth=8.94" Tc=1.0 min CN=98 0

Tc=1.0 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 - AJ NOAA 24-hr D 100-Year-Current Rainfall=9.18", P2=3.47" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 43 Summary for Subcatchment 4S: PDA #1 - Undetained Impervious Runoff = 1.96 cfs @ 12.10 hrs, Volume= 0.152 af, Depth= 8.94" 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 100-Year-Current Rainfall=9.18", 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 1.96 cfs 2 NOAA 24-hr D 100-Year-Current Rainfall=9.18" P2=3.47" Runoff Area=8,866 sf Runoff Volume=0.152 af

Runoff Volume=0.152 af Runoff Depth=8.94" Flow (cfs) Flow Length=419' 1 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 - AJ NOAA 24-hr D 100-Year-Current Rainfall=9.18", P2=3.47" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 44 Summary for Subcatchment 5S: PDA #1 - Undetained Pervious Runoff = 1.18 cfs @ 12.12 hrs, Volume= 0.085 af, Depth= 6.74" 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 100-Year-Current Rainfall=9.18", 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 Runoff 1.18 cfs NOAA 24-hr D 100-Year-Current Rainfall=9.18" 1 P2=3.47" Runoff Area=6,562 sf

" Runoff Area=6,562 sf Runoff Volume=0.085 af Runoff Depth=6.74" Flow (cfs) Flow Length=381' Tc=5.3 min CN=80 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 - AJ NOAA 24-hr D 100-Year-Current Rainfall=9.18", P2=3.47" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 45 Summary for Subcatchment 6S: PDA #1 - Impervious to Bio Runoff = 0.87 cfs @ 12.10 hrs, Volume= 0.067 af, Depth= 8.94" 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 100-Year-Current Rainfall=9.18", 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 0.95 Runoff 0.87 cfs 0.9 0.85 NOAA 24-hr D 0.8 100-Year-Current Rainfall=9.18" 0.75 P2=3.47" 0.7 0.65 Runoff Area=3,921 sf 0.6 Runoff Volume=0.067 af

Area=3,921 sf 0.6 Runoff Volume=0.067 af Runoff Depth=8.94" Flow (cfs) 0.55 0.5 Flow Length=60' 0.45 0.4 Tc=0.6 min 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)