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d. Public linear projects shall meet the requirements of the Rice Creek Watershed District <br />(RCWD) or Vadnais Lakes Area Water Management Organization (VLAWMO) as applicable. <br />e. Infiltration BMPs (see City BMP standard plates and design criteria) are to be <br />incorporated in areas with A and B hydrologic soil groups. Stormwater from impervious <br />surfaces other than rooftops must be pretreated before discharge to infiltration BMPs, to remove <br />sediment and floatables, or other materials that would restrict the BMP's capacity or contaminate <br />ground water. <br />f. If the project meets any of the following conditions listed in Table 3, infiltration is <br />prohibited and the water quality volume requirements shall be provided the remaining options in <br />Table 2: <br />Table 3. Specific conditions that may restrict infiltration. <br />Type <br />Specific Site Conditions <br />Potential <br />Contamination <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 infiltration area <br />Seasonal High Water Table within three vertical feet of bottom of <br />infiltration area <br />Where soil infiltration tests are more than 8.3 inches per hour <br />Land Use <br />Limitations <br />Utility Locations <br />Adjacent Wells <br />g. BMPs must provide infiltration where feasible. If the City concurs that the infiltration <br />BMPs are not feasible or directs that infiltration not be used, then any BMP may be chosen. If <br />infiltration is feasible on-site, then a regionally -sited BMP must provide equivalent runoff <br />volume reduction. <br />5) Peak stormwater runoff control. <br />a. Stormwater runoff rates for the proposed project at the site boundary, in aggregate, must <br />not exceed existing runoff rates for the critical 2-, 10-, and 100 -year frequency events. <br />b. Any increase in a critical event rate at a specific point of discharge from the site must be <br />limited and cause no adverse down gradient impact. The project must meet the hydroperiod <br />standards found in Table 4 with respect to all down -gradient wetlands. <br />draft 06-15 ECS Ordinance.docx <br />19/29 <br />