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<br />RCWD Alternative Compliance Sequencing Report <br />City of St. Anthony Village PAGE 19 <br />WSB Project No. 1626-53 <br /> <br />Using the linear footage estimates in Table 3, the required RCWD volume <br />reduction standard, annual runoff volume reduction, and equivalent annual <br />phosphorus removal has been calculated and listed in Table 4 below. The <br />impervious surface area is based on 32 foot wide roadways (two feet wider than the <br />standard width to account for possible deviations from standard), and an additional <br />20% to account for driveways and carriage walks within right of way. <br /> <br />Table 4: Required Volume Reduction & Equivalent Treatment for <br />Future Linear Projects by Subwatershed <br />Project <br />Year <br />Silver Lake Ramsey County Ditch 3 <br />RCWD volume <br />reduction <br />standard for <br />impervious <br />within ROW <br />(0.8-inches of <br />runoff) <br />(ft3) <br />Annual <br />volume <br />reduction <br />resulting from <br />RCWD <br />requirements <br />(ft3 / year) <br />Equivalent <br />annual total <br />phosphorus <br />removal <br />(lbs/year) <br />RCWD <br />volume <br />reduction <br />standard for <br />impervious <br />within ROW <br />(0.8-inches <br />of runoff) <br />(ft3) <br />Annual <br />volume <br />reduction <br />resulting from <br />RCWD <br />requirements <br />(ft3 / year) <br />Equivalent <br />annual total <br />phosphorus <br />removal <br />(lbs/year) <br />2012 2,253 40,190 0.9 0 0 0.0 <br />2013 5,120 91,341 2.0 0 0 0.0 <br />2014 0 0 0.0 8,499 151,626 3.4 <br />2015 0 0 0.0 8,858 158,020 3.5 <br />2016 0 0 0.0 4,659 83,120 1.9 <br />2017 0 0 0.0 8,525 152,082 3.4 <br />2018 0 0 0.0 9,114 162,587 3.6 <br />2019 0 0 0.0 6,605 117,830 2.6 <br />2020 0 0 0.0 8,525 152,082 3.4 <br />2021 0 0 0.0 7,936 141,578 3.2 <br />2022 0 0 0.0 2,355 42,017 0.9 <br />2023 0 0 0.0 0 0 0.0 <br />2024 8,602 153,453 3.4 0 0 0.0 <br />TOTAL 15,975 284,984 6.3 65,076 1,160,942 25.9 <br /> <br /> <br /> <br />