complete drainage report rev 9

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 2-Year Rainfall=3.44" Printed 10/25/2024 Page 92 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 42P: Basin 9 Time (hours) 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 22.00 24.00 26.00 28.00 30.00 32.00 34.00 36.00 38.00 40.00 42.00 44.00 46.00 48.00 50.00 52.00 54.00 56.00 58.00 60.00 62.00 64.00 66.00 68.00 70.00 72.00 74.00 76.00 78.00 80.00 Inflow (cfs) 0.00 0.01 0.01 0.02 0.03 0.06 0.79 0.09 0.05 0.03 0.03 0.03 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 0.00 Storage (cubic-feet) 0 1 1 2 3 6 77 10 5 4 3 3 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Elevation (feet) 562.00 562.00 562.00 562.00 562.00 562.00 562.03 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 Outflow (cfs) 0.00 0.00 0.01 0.02 0.03 0.06 0.61 0.09 0.05 0.03 0.03 0.03 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 0.00 Discarded (cfs) 0.00 0.00 0.01 0.02 0.03 0.06 0.61 0.09 0.05 0.03 0.03 0.03 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 0.00 Primary (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 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

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Stage-Discharge for Pond 42P: Basin 9 Elevation (feet) 562.00 562.05 562.10 562.15 562.20 562.25 562.30 562.35 562.40 562.45 562.50 562.55 562.60 562.65 562.70 562.75 562.80 562.85 562.90 562.95 563.00 563.05 563.10 563.15 563.20 563.25 563.30 563.35 563.40 563.45 563.50 563.55 563.60 563.65 563.70 563.75 563.80 563.85 563.90 563.95 564.00 564.05 564.10 564.15 564.20 564.25 564.30 564.35 564.40 Discharge (cfs) 0.00 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.62 0.65 0.67 0.69 0.70 0.72 0.73 0.74 0.75 0.76 0.77 0.78 0.78 0.79 0.80 0.81 0.81 0.82 0.83 0.98 1.25 1.60 2.01 2.47 2.98 3.53 4.11 Discarded (cfs) 0.00 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 Primary (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 0.01 0.02 0.04 0.06 0.08 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.19 0.20 0.21 0.21 0.22 0.37 0.64 0.99 1.40 1.87 2.37 2.92 3.51 Printed 10/25/2024 Page 93

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 42P: Basin 9 Elevation (feet) 562.00 562.05 562.10 562.15 562.20 562.25 562.30 562.35 562.40 562.45 562.50 562.55 562.60 562.65 562.70 562.75 562.80 562.85 562.90 562.95 563.00 563.05 563.10 563.15 563.20 563.25 563.30 563.35 563.40 563.45 563.50 563.55 563.60 563.65 563.70 563.75 563.80 563.85 563.90 563.95 564.00 564.05 564.10 564.15 564.20 564.25 564.30 564.35 564.40 Surface (sq-ft) 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 Storage (cubic-feet) 0 131 261 392 523 653 784 915 1,045 1,176 1,307 1,437 1,568 1,699 1,830 1,960 2,091 2,222 2,352 2,483 2,614 2,744 2,875 3,006 3,136 3,267 3,398 3,528 3,659 3,790 3,920 4,051 4,182 4,312 4,443 4,574 4,704 4,835 4,966 5,097 5,227 5,358 5,489 5,619 5,750 5,881 6,011 6,142 6,273 Printed 10/25/2024 Page 94

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 95 Summary for Pond 48P: Basin 8 Inflow Area = 61,044 sf, 62.67% Impervious, Inflow Depth = 2.53" for 2-Year event Inflow = 3.35 cfs @ 12.16 hrs, Volume= 12,855 cf Outflow = 2.44 cfs @ 12.23 hrs, Volume= 12,855 cf, Atten= 27%, Lag= 4.6 min Discarded = 2.44 cfs @ 12.23 hrs, Volume= 12,855 cf Primary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf Routed to Pond 49P : Basin 7 Routing by Stor-Ind method, Time Span= 0.00-80.00 hrs, dt= 0.04 hrs Peak Elev= 573.11' @ 12.23 hrs Surf.Area= 10,019 sf Storage= 434 cf Plug-Flow detention time= 1.1 min calculated for 12,849 cf (100% of inflow) Center-of-Mass det. time= 1.1 min ( 781.4 - 780.3 ) Volume #1 Invert 573.00' Elevation (feet) 573.00 574.00 575.00 576.00 Device #1 #2 #3 Avail.Storage 12,023 cf Surf.Area (sq-ft) 10,019 10,019 10,019 10,019 Routing Primary Primary Discarded Invert 575.00' 573.45' 573.00' Storage Description Custom Stage Data (Prismatic) Listed below (Recalc) 30,057 cf Overall x 40.0% Voids Inc.Store (cubic-feet) 0 10,019 10,019 10,019 Cum.Store (cubic-feet) 0 10,019 20,038 30,057 Outlet Devices 4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) 6.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads 10.000 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 571.00' Discarded OutFlow Max=2.44 cfs @ 12.23 hrs HW=573.11' (Free Discharge) 3=Exfiltration ( Controls 2.44 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=573.00' (Free Discharge) 1=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) 2=Orifice ( Controls 0.00 cfs) Pond 48P: Basin 8 Sharp-Crested Rectangular Weir Orifice Exfiltration

POA-2 NOAA 24-hr D 2-Year Rainfall=3.44" 2024-05-12 HydroCad - Proposed POA 2B-1 Printed 10/25/2024 Page 96 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 48P: Basin 8 Hydrograph 3.35 cfs 3 Inflow Area=61,044 sf Peak Elev=573.11' Storage=434 cf 2.44 cfs Inflow Outflow Discarded Primary Flow (cfs) 2.44 cfs 2 1 0.00 cfs 0 0 5 10 15 20 25 30 35 40 45 Time (hours) 50 55 60 65 70 75 80 Pond 48P: Basin 8 Stage-Discharge Total Discarded Primary 576 Sharp-Crested Rectangular Weir Elevation (feet) 575 574 Orifice Exfiltration 573 0 2 4 6 8 10 Discharge (cfs) 12 14 16 18

POA-2 NOAA 24-hr D 2-Year Rainfall=3.44" 2024-05-12 HydroCad - Proposed POA 2B-1 Printed 10/25/2024 Page 97 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 48P: Basin 8 Stage-Area-Storage 0 1,000 2,000 3,000 Surface/Horizontal/Wetted Area (sq-ft) 4,000 5,000 6,000 7,000 8,000 9,000 10,000 576 Elevation (feet) 575 574 Custom Stage Data 573 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 Storage (cubic-feet) 8,000 9,000 10,000 11,000 12,000 Surface Storage

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 2-Year Rainfall=3.44" Printed 10/25/2024 Page 98 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 48P: Basin 8 Time (hours) 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 22.00 24.00 26.00 28.00 30.00 32.00 34.00 36.00 38.00 40.00 42.00 44.00 46.00 48.00 50.00 52.00 54.00 56.00 58.00 60.00 62.00 64.00 66.00 68.00 70.00 72.00 74.00 76.00 78.00 80.00 Inflow (cfs) 0.00 0.01 0.03 0.04 0.07 0.13 1.61 0.21 0.12 0.08 0.07 0.06 0.05 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 0.00 Storage (cubic-feet) 0 1 1 2 4 7 76 11 6 4 3 3 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Elevation (feet) 573.00 573.00 573.00 573.00 573.00 573.00 573.02 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 Outflow (cfs) 0.00 0.01 0.03 0.04 0.07 0.13 1.49 0.21 0.12 0.08 0.07 0.06 0.05 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 0.00 Discarded (cfs) 0.00 0.01 0.03 0.04 0.07 0.13 1.49 0.21 0.12 0.08 0.07 0.06 0.05 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 0.00 Primary (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 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

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 2-Year Rainfall=3.44" Printed 10/25/2024 Page 99 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Stage-Discharge for Pond 48P: Basin 8 Elevation (feet) 573.00 573.05 573.10 573.15 573.20 573.25 573.30 573.35 573.40 573.45 573.50 573.55 573.60 573.65 573.70 573.75 573.80 573.85 573.90 573.95 574.00 574.05 574.10 574.15 574.20 574.25 574.30 574.35 574.40 574.45 574.50 574.55 574.60 574.65 574.70 574.75 574.80 574.85 574.90 574.95 575.00 575.05 575.10 575.15 575.20 575.25 575.30 575.35 575.40 575.45 575.50 Discharge (cfs) 0.00 2.38 2.44 2.49 2.55 2.61 2.67 2.73 2.78 2.84 2.91 2.99 3.08 3.18 3.30 3.42 3.54 3.67 3.79 3.89 4.00 4.10 4.19 4.29 4.38 4.47 4.56 4.65 4.73 4.82 4.90 4.99 5.07 5.15 5.24 5.32 5.40 5.48 5.56 5.64 5.72 5.94 6.28 6.70 7.19 7.72 8.30 8.92 9.58 10.27 11.00 Discarded (cfs) 0.00 2.38 2.44 2.49 2.55 2.61 2.67 2.73 2.78 2.84 2.90 2.96 3.01 3.07 3.13 3.19 3.25 3.30 3.36 3.42 3.48 3.54 3.59 3.65 3.71 3.77 3.83 3.88 3.94 4.00 4.06 4.12 4.17 4.23 4.29 4.35 4.41 4.46 4.52 4.58 4.64 4.70 4.75 4.81 4.87 4.93 4.99 5.04 5.10 5.16 5.22 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.03 0.07 0.11 0.17 0.23 0.30 0.36 0.43 0.47 0.52 0.56 0.60 0.63 0.67 0.70 0.73 0.76 0.79 0.82 0.85 0.87 0.90 0.92 0.95 0.97 0.99 1.01 1.04 1.06 1.08 1.24 1.53 1.89 2.32 2.79 3.31 3.88 4.48 5.11 5.78 Elevation (feet) 575.55 575.60 575.65 575.70 575.75 575.80 575.85 575.90 575.95 576.00 Discharge (cfs) 11.75 12.53 13.34 14.18 15.04 15.92 16.82 17.75 18.69 19.66 Discarded (cfs) 5.28 5.33 5.39 5.45 5.51 5.57 5.62 5.68 5.74 5.80 Primary (cfs) 6.47 7.20 7.95 8.73 9.53 10.35 11.20 12.07 12.95 13.86

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 2-Year Rainfall=3.44" Printed 10/25/2024 Page 100 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 48P: Basin 8 Elevation (feet) 573.00 573.05 573.10 573.15 573.20 573.25 573.30 573.35 573.40 573.45 573.50 573.55 573.60 573.65 573.70 573.75 573.80 573.85 573.90 573.95 574.00 574.05 574.10 574.15 574.20 574.25 574.30 574.35 574.40 574.45 574.50 574.55 574.60 574.65 574.70 574.75 574.80 574.85 574.90 574.95 575.00 575.05 575.10 575.15 575.20 575.25 575.30 575.35 575.40 575.45 575.50 Surface (sq-ft) 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 Storage (cubic-feet) 0 200 401 601 802 1,002 1,202 1,403 1,603 1,803 2,004 2,204 2,405 2,605 2,805 3,006 3,206 3,406 3,607 3,807 4,008 4,208 4,408 4,609 4,809 5,010 5,210 5,410 5,611 5,811 6,011 6,212 6,412 6,613 6,813 7,013 7,214 7,414 7,614 7,815 8,015 8,216 8,416 8,616 8,817 9,017 9,217 9,418 9,618 9,819 10,019 Elevation (feet) 575.55 575.60 575.65 575.70 575.75 575.80 575.85 575.90 575.95 576.00 Surface (sq-ft) 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 Storage (cubic-feet) 10,219 10,420 10,620 10,821 11,021 11,221 11,422 11,622 11,822 12,023

POA-2 NOAA 24-hr D 2-Year Rainfall=3.44" 2024-05-12 HydroCad - Proposed POA 2B-1 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 101 Summary for Pond 49P: Basin 7 Inflow Area = 165,500 sf, 50.78% Impervious, Inflow Depth = 1.38" for 2-Year event Inflow = 4.44 cfs @ 12.20 hrs, Volume= 19,011 cf Outflow = 0.53 cfs @ 13.31 hrs, Volume= 13,242 cf, Atten= 88%, Lag= 66.6 min Primary = 0.53 cfs @ 13.31 hrs, Volume= 13,242 cf Routed to Link 28L : POA 2 Routing by Stor-Ind method, Time Span= 0.00-80.00 hrs, dt= 0.04 hrs Peak Elev= 531.74' @ 13.31 hrs Surf.Area= 15,670 sf Storage= 11,169 cf Plug-Flow detention time= 476.0 min calculated for 13,235 cf (70% of inflow) Center-of-Mass det. time= 368.8 min ( 1,168.4 - 799.6 ) Volume #1 Invert 531.00' Elevation (feet) 531.00 532.00 533.00 534.00 Device #1 Avail.Storage 50,966 cf Surf.Area (sq-ft) 14,375 16,117 17,860 19,602 Routing Primary Invert 531.38' Storage Description Custom Stage Data (Prismatic) Listed below (Recalc) Inc.Store (cubic-feet) 0 15,246 16,989 18,731 Cum.Store (cubic-feet) 0 15,246 32,235 50,966 Outlet Devices 12.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.53 cfs @ 13.31 hrs HW=531.74' (Free Discharge) 1=Orifice (Orifice Controls 0.53 cfs @ 2.05 fps) Pond 49P: Basin 7 Orifice