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3. Table 5). Infiltration area will be limited to the horizontal areas subject to prolonged <br />wetting; <br />Table 5. Soil Infiltration Rates <br />HSG <br />Soil Texture* <br />Corresponding Unified Soil Classification** <br />Infiltration <br />Rate [in/hr] <br />A <br />GravelGP <br />Sandy Gravel <br />Silty Gravel <br />GW <br />Well -graded gravels, sandy gravels <br />1.63 <br />Gap -graded or uniform gravels, sandy <br />gravels <br />GM <br />Silty gravels, silty sandy gravels <br />SW <br />Well -graded gravelly sands <br />Sand <br />Loamy Sand <br />Sandy Loam <br />SP <br />Gap -graded or uniform sands, gravelly <br />sands <br />0.8 <br />B <br />Loam <br />Silt Loam <br />SM <br />Silty sands, silty gravelly sands <br />0.45 <br />M11 <br />Micaceous silts, diatomaceous silts, <br />volcanic ash <br />0.3 <br />C <br />Sandy Clay <br />Loam <br />ML <br />Silts, very fine sands, silty or clayey fine <br />sands <br />0.2 <br />D <br />Clay Loam <br />Silty Clay Loam <br />Sandy clay <br />Silty Clay <br />Clay <br />GC <br />Clayey gravels, clayey sandy gravels <br />0.06 <br />SC <br />Clayey sands, clayey sandy gravels <br />CL <br />Low plasticity clays, sandy or silty clays <br />OL <br />Organic silts and clays of low plasticity <br />CH <br />Highly plastic clays and sandy clays <br />011 <br />Organic silts and clays of high plasticity <br />Source Adapted from the `Design Infiltration Rates" table from the Minnesota Stormwater <br />Manual, MPCA (January 2014). <br />* U.S. Department of Agriculture, Natural Resources Conservation Service, 2005. <br />National Soil Survey Handbook, title 430 -VI. (Online) Available: <br />http://soils.usda.gov/technical/handbook/. <br />** ASTM standard D2487-00 <br />4. A minimum of three feet of separation from the seasonal high water table. <br />5. Design and placement in accordance with the 2007 Minnesota Department of Health <br />guidance Evaluating Proposed Stormwater Infiltration Projects in Vulnerable Wellhead <br />Protection Areas. <br />b. Water Reuse. Water Reuse BMPs must be designed to provide: <br />area(s); <br />1. A maximum irrigation rate of 1 -inch per week over the irrigated lawn/turf grass <br />2. No greater than a 26 week (April 15th to October 15th) growing season; and <br />3. No increase in stormwater runoff from the irrigated area or project site. <br />draft 06-15 ECS Ordinance.docx <br />Commented [I(T2]: http://www.health.state.mn.us/divs/eh/water <br />/swp/stormwater.pdf <br />21/29 <br />