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*"t �ri�lSite <br /> C. R O U P <br /> Stormwater Water Quality and Volume Summary <br /> Drainage Area Required Infiltration Vol. Summary Filtration Volume = (New or reconstructed <br /> New Impv. Area (sf) Required Volume(cf) impervious (sf)" 1.1 in)/(0.50"12(in/ft)) <br /> PR1A(TO EX WETLAND) 0 0 <br /> PR1 B (TO FIL BASIN 1) 22963 4210 <br /> PR1C(TO FIL BASIN 2) 23783 4360 <br /> PR2(TO LONG LAKE RD) 1396 256 <br /> PR3(TO EAST) 0 1 0 <br /> P R4(OFF-SITE TO FIL.BASIN 2) N/A N/A <br /> TOTAL 48142 8826 <br /> Proposed BMP Area Provided Vol (cO Drawdown Time Calculations(0.8"/Hour) <br /> Inf. Area (sf) Assoc. Inf. Height(ft) Drawdown Time (h) <br /> Filtration Basin 1 (Vol below 908.60) 4122 2525 1.63 24.49 <br /> Filtration Basin 2(Vol below 908.50) 5117 2909 1.76 26.39 <br /> TOTAL 9239 <br /> As shown in the tables above, the proposed volume of 9,239 CF is larger than the required volume of 8,826 <br /> CF— REQUIREMENT SATISFIED <br /> 4.0 Wetland Calculations: <br /> 4.1 Wetland Buffer <br /> One wetland exists on this property. Based on a wetland delineation performed by Jacobson Environmental <br /> dated October 3rd, 2025. Per Rice Creek Watershed, there is no setback requirement from the delineated <br /> edge. There is a 25 ft buffer that is shown on the civil plans. <br /> 4.2 Wetland Rates,Volume, and HWL <br /> One wetland exists on this property. The wetland will not be impacted by the project. <br /> Existing and proposed inflow rates for the 2-YR, 10-YR, and 100-YR rainfall events are shown in the table <br /> below <br /> Overall Stormwater Rate To Ex. Wetland -Obtained from 1R in HydroCAD <br /> Existing Conditions Proposed Conditions <br /> Rate (cfs) Rate (cfs) <br /> 2-Year Event 10.33 6.16 <br /> 10-Year Event 18.76 13.91 <br /> 100-Year Event 38.25 31.12 <br /> 5.0 Conclusions: <br /> To the best of our knowledge, this project meets all State, City, and Watershed stormwater management <br /> requirements. <br /> Civil Site Group, PC• 5000 Glenwood Avenue• Golden Valley Minnesota 55422 <br /> www.CivilSiteGroup.com•(612)615-0060 <br />