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CCP 09-10-2001
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CCP 09-10-2001
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<br />I <br />I <br />,. <br />I <br />I <br />I <br />I <br />I <br />I <br />.. <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />, <br />I <br /> <br />9,7.01 <br /> <br />The term structural BMP refers to a physical facility designed and constructed <br />to remove pollutants from storm water runoff, potentially reduce downstream <br />erosion, provide flood control, and promote ground water recharge. Typical <br />structural BMPs include: <br /> <br />. Detention basins <br /> <br />. Retention basins <br /> <br />. Constructed wetlands <br /> <br />. Infiltration practices <br /> <br />. Filters <br /> <br />. Biofilters (swales and filter strips) <br /> <br />. Precast or cast-in-place treatment devices. <br /> <br />The typical capital costs for BMPs were evaluated based upon a recent U.S. <br />Environmental Protection Agency document entitled: Preliminary Data <br />Summary of Urban Storm Water Best Management Practices, (Office of <br />Water, Washington, D.C. August, 1999. EPA-82l-R-99-012). Table 9 has <br />been adapted from the USEPA document (Table 6-1, page 6-3) to show <br />typical capital construction costs. <br /> <br />Table 9 <br />Annual Operating Costs <br /> <br />BM? Type Typical Cost' Notes Annual Maintenance Cost <br /> ($/cf) , (% of Construction Cost) <br />Retention and 0.55-1.11 Cost range reflects economies of scale 3%-6% <br />Detention Basins in designing this BMP. The lowest unit <br /> cost represents approx. 150,000 CF of <br /> Istorage, while the highest is approx. <br /> 15,000 CF. <br />Constructed 0.66 - 1.38 Little data available to assess cost. It is < 1% <br />Wetland assumed they are approx. 25% more <br /> expensive due to plant selection and <br /> sediment forebay requirements than <br /> detention basins. <br />Infiltration Trench , 4.43 I ~epresents typical cost for a 100-foot 2% <br /> long trench. <br />Infiltration Basin 1.44 I Represents typical cost for a 0.25-acre 5%-10% <br /> infmration basin. <br />Sand Filter 3.32 - 6.65 Range in costs largely due to different 11%-13% <br /> designs, Of the three mosf common, <br /> perimeter sand filters are moderate cost <br /> while suliace and underground sand <br /> filters are the most expensive. <br /> <br />City of Arden Hills, Minnesota <br />Local Water Resource Management Plan <br /> <br />A,ARDEN0101.00 <br />Page 45 <br />
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