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<br />I <br /> <br />Ie <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />II <br />I <br />I <br />I <br />I <br />I <br />'. <br />~ <br /> <br />I <br /> <br />2.11.02 <br /> <br />CostiBenefit for Pollutant Removal <br /> <br />Storm water best management practices (BMPs) as described in the LSWMP <br />are the primary tool to improve the quality of urban streams and meet future <br />NPDES Phase II requirements. The BMPs include both structural and non- <br />structural alternatives. Resources and references on BMP's can be found in <br />Appendix M. The LSWMP suggests the construction of detention ponds as the <br />BMP for future urban storm water pollution control. <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 />. Detention basins <br />. Retention basins <br />. Constructed wetlands <br />. Infiltration practices <br />. Filters <br />. Biofilters (swales and filter strips) <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-821-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 />City of Arden Hills, Minnesota <br />Local Stormwater Management Plan <br /> <br />A-ARDEN0101.00 <br />Page 46 <br />