251203_42 ERW_Stormwater Report

251202_42 ERW Waystone - Future Rainfall NOAA 24-hr D 100-Year Rainfall=11.52" Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 12/3/2025 Page 70 Summary for Subcatchment PR 1B-I: Runoff = 10.27 cfs @ 12.07 hrs, Volume= Routed to Reach 10R : 0.796 af, Depth=11.28" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA 24-hr D 100-Year Rainfall=11.52" Area (sf) 21,449 15,457 36,906 36,906 CN 98 98 98 Description Roofs, HSG C Paved parking, HSG C Weighted Average 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.2 100 0.0200 1.43 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.44" 0.3 36 0.0097 2.00 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.5 136 Total Subcatchment PR 1B-I: Hydrograph Runoff 11 10.27 cfs NOAA 24-hr D 100-Year Rainfall=11.52" Runoff Area=36,906 sf Runoff Volume=0.796 af Runoff Depth=11.28" Flow Length=136' Tc=1.5 min CN=98 10 9 8 Flow (cfs) 7 6 5 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)

251202_42 ERW Waystone - Future Rainfall NOAA 24-hr D 100-Year Rainfall=11.52" Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment PR 1B-I: Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 1.00 0.13 0.03 2.00 0.28 0.13 3.00 0.43 0.26 4.00 0.60 0.41 5.00 0.79 0.59 6.00 0.98 0.77 7.00 1.21 1.00 8.00 1.49 1.28 9.00 1.83 1.60 10.00 2.28 2.06 11.00 2.99 2.76 12.00 5.52 5.28 13.00 8.53 8.29 14.00 9.24 9.00 15.00 9.69 9.45 16.00 10.03 9.78 17.00 10.31 10.07 18.00 10.54 10.30 19.00 10.73 10.49 20.00 10.92 10.67 21.00 11.09 10.84 22.00 11.24 11.00 23.00 11.39 11.15 24.00 11.52 11.28 25.00 11.52 11.28 26.00 11.52 11.28 27.00 11.52 11.28 28.00 11.52 11.28 29.00 11.52 11.28 30.00 11.52 11.28 31.00 11.52 11.28 32.00 11.52 11.28 33.00 11.52 11.28 34.00 11.52 11.28 35.00 11.52 11.28 36.00 11.52 11.28 37.00 11.52 11.28 38.00 11.52 11.28 39.00 11.52 11.28 40.00 11.52 11.28 41.00 11.52 11.28 42.00 11.52 11.28 43.00 11.52 11.28 44.00 11.52 11.28 45.00 11.52 11.28 46.00 11.52 11.28 47.00 11.52 11.28 48.00 11.52 11.28 49.00 11.52 11.28 50.00 11.52 11.28 51.00 11.52 11.28 Runoff (cfs) 0.00 0.06 0.10 0.12 0.14 0.15 0.17 0.21 0.26 0.30 0.46 0.83 6.58 0.91 0.47 0.32 0.26 0.22 0.18 0.16 0.15 0.14 0.13 0.12 0.10 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time Precip. Excess (hours) (inches) (inches) 52.00 11.52 11.28 53.00 11.52 11.28 54.00 11.52 11.28 55.00 11.52 11.28 56.00 11.52 11.28 57.00 11.52 11.28 58.00 11.52 11.28 59.00 11.52 11.28 60.00 11.52 11.28 61.00 11.52 11.28 62.00 11.52 11.28 63.00 11.52 11.28 64.00 11.52 11.28 65.00 11.52 11.28 66.00 11.52 11.28 67.00 11.52 11.28 68.00 11.52 11.28 69.00 11.52 11.28 70.00 11.52 11.28 71.00 11.52 11.28 72.00 11.52 11.28 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Printed 12/3/2025 Page 71

NOAA 24-hr D 100-Year Rainfall=11.52" 251202_42 ERW Waystone - Future Rainfall Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 12/3/2025 Page 72 Summary for Subcatchment PR 1B-P: Runoff = 16.19 cfs @ 12.15 hrs, Volume= Routed to Reach 10R : 1.307 af, Depth= 8.85" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA 24-hr D 100-Year Rainfall=11.52" Area (sf) 50,619 26,576 77,195 77,195 CN 74 89 79 Description >75% Grass cover, Good, HSG C Gravel roads, HSG C Weighted Average 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.2 100 0.0400 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 0.5 95 0.0361 3.06 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 7.7 195 Total Subcatchment PR 1B-P: Hydrograph 18 Runoff 17 16.19 cfs NOAA 24-hr D 100-Year Rainfall=11.52" Runoff Area=77,195 sf Runoff Volume=1.307 af Runoff Depth=8.85" Flow Length=195' Tc=7.7 min CN=79 16 15 14 13 12 Flow (cfs) 11 10 9 8 7 6 5 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)

251202_42 ERW Waystone - Future Rainfall NOAA 24-hr D 100-Year Rainfall=11.52" Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment PR 1B-P: Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 1.00 0.13 0.00 2.00 0.28 0.00 3.00 0.43 0.00 4.00 0.60 0.00 5.00 0.79 0.02 6.00 0.98 0.07 7.00 1.21 0.14 8.00 1.49 0.26 9.00 1.83 0.42 10.00 2.28 0.70 11.00 2.99 1.18 12.00 5.52 3.25 13.00 8.53 6.00 14.00 9.24 6.67 15.00 9.69 7.10 16.00 10.03 7.42 17.00 10.31 7.68 18.00 10.54 7.90 19.00 10.73 8.09 20.00 10.92 8.27 21.00 11.09 8.43 22.00 11.24 8.58 23.00 11.39 8.72 24.00 11.52 8.85 25.00 11.52 8.85 26.00 11.52 8.85 27.00 11.52 8.85 28.00 11.52 8.85 29.00 11.52 8.85 30.00 11.52 8.85 31.00 11.52 8.85 32.00 11.52 8.85 33.00 11.52 8.85 34.00 11.52 8.85 35.00 11.52 8.85 36.00 11.52 8.85 37.00 11.52 8.85 38.00 11.52 8.85 39.00 11.52 8.85 40.00 11.52 8.85 41.00 11.52 8.85 42.00 11.52 8.85 43.00 11.52 8.85 44.00 11.52 8.85 45.00 11.52 8.85 46.00 11.52 8.85 47.00 11.52 8.85 48.00 11.52 8.85 49.00 11.52 8.85 50.00 11.52 8.85 51.00 11.52 8.85 Runoff (cfs) 0.00 0.00 0.00 0.00 0.01 0.05 0.09 0.16 0.24 0.34 0.59 1.18 8.15 1.94 0.96 0.66 0.53 0.45 0.36 0.33 0.31 0.28 0.26 0.24 0.22 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time Precip. Excess (hours) (inches) (inches) 52.00 11.52 8.85 53.00 11.52 8.85 54.00 11.52 8.85 55.00 11.52 8.85 56.00 11.52 8.85 57.00 11.52 8.85 58.00 11.52 8.85 59.00 11.52 8.85 60.00 11.52 8.85 61.00 11.52 8.85 62.00 11.52 8.85 63.00 11.52 8.85 64.00 11.52 8.85 65.00 11.52 8.85 66.00 11.52 8.85 67.00 11.52 8.85 68.00 11.52 8.85 69.00 11.52 8.85 70.00 11.52 8.85 71.00 11.52 8.85 72.00 11.52 8.85 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Printed 12/3/2025 Page 73

NOAA 24-hr D 100-Year Rainfall=11.52" 251202_42 ERW Waystone - Future Rainfall Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 12/3/2025 Page 74 Summary for Subcatchment PR 2-P: Runoff = 1.64 cfs @ 12.11 hrs, Volume= Routed to Reach DP2-PR : 0.120 af, Depth= 8.44" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA 24-hr D 100-Year Rainfall=11.52" Area (sf) 6,447 958 7,405 7,405 CN 74 89 76 Description >75% Grass cover, Good, HSG C Gravel roads, HSG C Weighted Average 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.6 84 0.0833 0.30 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" Subcatchment PR 2-P: Hydrograph Runoff Flow (cfs) 1.64 cfs NOAA 24-hr D 100-Year Rainfall=11.52" Runoff Area=7,405 sf Runoff Volume=0.120 af Runoff Depth=8.44" Flow Length=84' Slope=0.0833 '/' Tc=4.6 min CN=76 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)

251202_42 ERW Waystone - Future Rainfall NOAA 24-hr D 100-Year Rainfall=11.52" Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment PR 2-P: Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 1.00 0.13 0.00 2.00 0.28 0.00 3.00 0.43 0.00 4.00 0.60 0.00 5.00 0.79 0.01 6.00 0.98 0.04 7.00 1.21 0.09 8.00 1.49 0.19 9.00 1.83 0.33 10.00 2.28 0.57 11.00 2.99 1.01 12.00 5.52 2.97 13.00 8.53 5.64 14.00 9.24 6.29 15.00 9.69 6.72 16.00 10.03 7.03 17.00 10.31 7.29 18.00 10.54 7.51 19.00 10.73 7.70 20.00 10.92 7.87 21.00 11.09 8.03 22.00 11.24 8.18 23.00 11.39 8.32 24.00 11.52 8.44 25.00 11.52 8.44 26.00 11.52 8.44 27.00 11.52 8.44 28.00 11.52 8.44 29.00 11.52 8.44 30.00 11.52 8.44 31.00 11.52 8.44 32.00 11.52 8.44 33.00 11.52 8.44 34.00 11.52 8.44 35.00 11.52 8.44 36.00 11.52 8.44 37.00 11.52 8.44 38.00 11.52 8.44 39.00 11.52 8.44 40.00 11.52 8.44 41.00 11.52 8.44 42.00 11.52 8.44 43.00 11.52 8.44 44.00 11.52 8.44 45.00 11.52 8.44 46.00 11.52 8.44 47.00 11.52 8.44 48.00 11.52 8.44 49.00 11.52 8.44 50.00 11.52 8.44 51.00 11.52 8.44 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.02 0.03 0.05 0.11 0.94 0.17 0.09 0.06 0.05 0.04 0.03 0.03 0.03 0.03 0.02 0.02 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time Precip. Excess (hours) (inches) (inches) 52.00 11.52 8.44 53.00 11.52 8.44 54.00 11.52 8.44 55.00 11.52 8.44 56.00 11.52 8.44 57.00 11.52 8.44 58.00 11.52 8.44 59.00 11.52 8.44 60.00 11.52 8.44 61.00 11.52 8.44 62.00 11.52 8.44 63.00 11.52 8.44 64.00 11.52 8.44 65.00 11.52 8.44 66.00 11.52 8.44 67.00 11.52 8.44 68.00 11.52 8.44 69.00 11.52 8.44 70.00 11.52 8.44 71.00 11.52 8.44 72.00 11.52 8.44 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Printed 12/3/2025 Page 75

NOAA 24-hr D 100-Year Rainfall=11.52" 251202_42 ERW Waystone - Future Rainfall Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 12/3/2025 Page 76 Summary for Reach 10R: Inflow Area = 2.619 ac, 32.35% Impervious, Inflow Depth = 9.63" for 100-Year event Inflow = 23.63 cfs @ 12.10 hrs, Volume= 2.103 af Outflow = 23.63 cfs @ 12.10 hrs, Volume= 2.103 af, Atten= 0%, Lag= 0.0 min Routed to Pond BASIN : Routing by Stor-Ind+Trans method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Reach 10R: Hydrograph 26 Inflow Outflow 23.63 cfs 23.63 cfs 24 Inflow Area=2.619 ac 22 20 18 Flow (cfs) 16 14 12 10 8 6 4 2 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)

251202_42 ERW Waystone - Future Rainfall NOAA 24-hr D 100-Year Rainfall=11.52" Printed 12/3/2025 Page 77 Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 10R: Time (hours) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 18.00 19.00 20.00 21.00 22.00 23.00 24.00 25.00 26.00 27.00 28.00 29.00 30.00 31.00 32.00 33.00 34.00 35.00 36.00 37.00 38.00 39.00 40.00 41.00 42.00 43.00 44.00 45.00 46.00 47.00 48.00 49.00 50.00 51.00 Inflow Elevation (cfs) (feet) 0.00 0.06 0.10 0.12 0.15 0.21 0.26 0.37 0.50 0.64 1.05 2.01 14.73 2.85 1.43 0.97 0.80 0.67 0.54 0.49 0.46 0.42 0.39 0.36 0.32 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Outflow (cfs) 0.00 0.06 0.10 0.12 0.15 0.21 0.26 0.37 0.50 0.64 1.05 2.01 14.73 2.85 1.43 0.97 0.80 0.67 0.54 0.49 0.46 0.42 0.39 0.36 0.32 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time (hours) 52.00 53.00 54.00 55.00 56.00 57.00 58.00 59.00 60.00 61.00 62.00 63.00 64.00 65.00 66.00 67.00 68.00 69.00 70.00 71.00 72.00 Inflow (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Elevation (feet) Outflow (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

251202_42 ERW Waystone - Future Rainfall NOAA 24-hr D 100-Year Rainfall=11.52" Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 12/3/2025 Page 78 Summary for Reach DP1-PR: Inflow Area = Inflow = Outflow = 2.922 ac, 29.00% Impervious, Inflow Depth = 7.28" for 100-Year event 14.42 cfs @ 12.22 hrs, Volume= 1.772 af 14.42 cfs @ 12.22 hrs, Volume= 1.772 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Reach DP1-PR: Hydrograph 16 Inflow Outflow 14.42 cfs 15 14.42 cfs 14 Inflow Area=2.922 ac 13 12 11 Flow (cfs) 10 9 8 7 6 5 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)

251202_42 ERW Waystone - Future Rainfall NOAA 24-hr D 100-Year Rainfall=11.52" Printed 12/3/2025 Page 79 Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach DP1-PR: Time (hours) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 18.00 19.00 20.00 21.00 22.00 23.00 24.00 25.00 26.00 27.00 28.00 29.00 30.00 31.00 32.00 33.00 34.00 35.00 36.00 37.00 38.00 39.00 40.00 41.00 42.00 43.00 44.00 45.00 46.00 47.00 48.00 49.00 50.00 51.00 Inflow Elevation (cfs) (feet) 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.03 0.04 0.06 0.49 1.15 6.91 5.64 1.81 1.29 0.93 0.63 0.43 0.33 0.28 0.24 0.21 0.17 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Outflow (cfs) 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.03 0.04 0.06 0.49 1.15 6.91 5.64 1.81 1.29 0.93 0.63 0.43 0.33 0.28 0.24 0.21 0.17 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time (hours) 52.00 53.00 54.00 55.00 56.00 57.00 58.00 59.00 60.00 61.00 62.00 63.00 64.00 65.00 66.00 67.00 68.00 69.00 70.00 71.00 72.00 Inflow (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Elevation (feet) Outflow (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00