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Pond/Wetland Impervious surface [ft2] * 1.1 [in] / (0.55 * 12 [in/ft]) <br />Stormwater <br />Ponds <br />Wet Pond Impervious surface [ft2] * 1.1 [in] / (0.50 * 12 [in/ft]) <br />Multiple Pond Impervious surface [ft2] * 1.1 [in] / (0.60 * 12 [in/ft]) <br /> <br /> (c) The required water quality treatment volume standard for public linear projects is determined as <br />follows: <br /> <br />Required Water <br />Quality Treatment <br />Volume [ft 3] <br />= <br />Area of New or <br />Reconstructed <br />Impervious Surface <br />[ft2] <br />x 0.75 [in]÷ 12 [in/ft] <br /> <br /> (d) Public linear projects shall meet the requirements of the Rice Creek Watershed District (RCWD) or <br />Vadnais Lakes Area Water Management Organization (VLAWMO) as applicable. <br /> (e) Infiltration BMPs (see city BMP standard plates and design criteria) are to be incorporated in areas <br />with A and B hydrologic soil groups. Stormwater from impervious surfaces other than rooftops must be <br />pretreated before discharge to infiltration BMPs, to remove sediment and floatables, or other materials that <br />would restrict the BMP's capacity or contaminate ground water. <br /> (f) If the project meets any of the following conditions listed in Table 3, infiltration is prohibited and <br />the water quality volume requirements shall be provided the remaining options in Table 2: <br /> <br /> Table 3. Specific conditions that may restrict inflitration. <br />Type Specific Site Conditions <br />Potential <br />Contaminati <br />on <br />Potential stormwater hotspots [PSH] <br />Contaminated soils <br />Vehicle fueling and maintenance areas <br />Physical <br />Limitations <br />Low permeability soils [HSG C and D] <br />Bedrock within three vertical feet of bottom of <br />infiltration area <br />Seasonal high water table within three vertical feet of <br />bottom of infiltration area <br />Where soil infiltration tests are more than 8.3 inches per <br />hour <br />Land Use <br />Limitations <br />Utility locations <br />Adjacent wells <br /> <br /> (g) BMPs must provide infiltration where feasible. If the city concurs that the infiltration BMPs are not <br />feasible or directs that infiltration not be used, then any BMP may be chosen. If infiltration is feasible on- <br />site, then a regionally-sited BMP must provide equivalent runoff volume reduction. <br /> (5) Peak stormwater runoff control.