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Water Quality Management Plan (WQMP) <br />Mainplace Mall Specific Plan <br />IV.3.2 Infiltration BMPs <br />Identify infiltration BMPs to be used in project. If design volume cannot be met, state why. <br />Name <br />Included? <br />Bioretention without underdrains <br />❑ <br />Rain gardens <br />❑ <br />Porous landscaping <br />❑ <br />Infiltration planters <br />❑ <br />Retention swales <br />❑ <br />Infiltration trenches <br />❑ <br />Infiltration basins <br />❑ <br />Drywells <br />❑ <br />Subsurface infiltration galleries <br />French drains <br />❑ <br />Permeable asphalt <br />❑ <br />Permeable concrete <br />❑ <br />Permeable concrete pavers <br />❑ <br />Show calculations below to demonstrate if the LID Design Strom Capture Volume can be met <br />with infiltration BMPs. If not, document how much can be met with infiltration and document <br />why it is not feasible to meet the full volume with infiltration BMPs. <br />Soil testing results have indicated that infiltration will likely be feasible in the first 30 feet of soil <br />depth. Below 30 feet, the soils have better infiltration properties. The groundwater table is more <br />than 100 feet deep based on current testing requirement; however, infiltration criteria is oftentimes <br />based on the historic high water value. The historic high water is at 30 feet to 40 feet deep. The <br />historic high water constraint, if applied to the site, would render deep infiltration infeasible since <br />the deeper soils could be saturated. Additional infiltration tests will be required for individual <br />project moving forward. <br />Centennial Section IV <br />Conceptual Specific Plan WQMP Page 24 <br />