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Water Quality Management Plan (WQMP) <br />Mainplace Mall Specific Plan <br />Project Performance Criteria <br />If HCOC exists, list applicable <br />No HCOCs. The project 2-year runoff volume is not increased by <br />hydromodification control <br />more than 5% and the project time of concentration is not <br />performance criteria (Section <br />reduced by more than 5%. <br />7.II-2.4.2.2 in MWQMP) <br />• Retain, on -site, (infiltrate, harvest and use, or <br />evapotranspire) stormwater runoff as feasible up to the <br />Design Capture Volume, and <br />List applicable LID . Recover (i.e., draw down) the storage volume as soon as <br />performance criteria (Section <br />possible after a storm event and <br />7.II-2.4.3 from MWQMP) <br />• Biotreat, on -site, additional runoff, as feasible, up to 80 <br />percent average annual capture efficiency (cumulative, <br />retention plus biotreatment), <br />If it is not feasible to meet LID performance criteria through <br />retention and/or biotreatment provided on -site or at a sub- <br />regional/regional scale, then treatment control BMPs shall be <br />List applicable treatment <br />provided on -site or offsite prior to discharge to waters of the US. <br />control BMP performance <br />Sizing of treatment control BMP(s) shall be based on either the <br />criteria (Section 7.II-3.2.2 from <br />unmet volume after claiming applicable water quality credits. If <br />MWQMP) treatment control BMPs can treat all of the remaining unmet <br />volume and have a medium to high effectiveness for reducing <br />the primary POCs, the project is considered to be in compliance. <br />C = (0.75xo.9+.15)=0.825 <br />D=0.80" <br />P_@IOiTs <br />Calculate LID design storm <br />V=117,500 Cubic Feet <br />capture volume for Project. <br />After 50% reduction (see below for credits): <br />V=58,750 Cubic Feet <br />This volume is for the entire Specific Plan area. <br />Centennial Section IV <br />Conceptual Specific Plan WQMP Page 20 <br />