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Element#11: Maintain BMPs <br /> Temporary and permanent erosion and sediment control BMPs shall be maintained and repaired <br /> as needed to ensure continued performance of their intended function. <br /> Element #12: Manage the Project <br /> A separate Stormwater Pollution Prevention Plan(SWPPP) that provides detailed guidance has <br /> been prepared for this project. Since the project area is more than one acre, a Certified Erosion <br /> and Sediment Control Lead is required. <br /> Element#13: Protect Low Impact Development BMPs <br /> Protect proposed bioretention cell areas from construction equipment and foot traffic. <br /> ON-SITE STORMWATER MANAGEMENT <br /> This project is a redevelopment project draining to the combined sewer system and is not <br /> required to meet the stormwater management standards outlined in the 2019 Stormwater Manual <br /> and Section 4 of the DCSS. <br /> Based on Section 6-10.1 of the DCSS, Flow Control BMPs are not required because: 1) net new <br /> impervious surfacing is less than 200 square feet, and 2) less than 0.25 acre of native vegetation <br /> is being converted to lawn or landscaping. <br /> The table below summarizes the existing and proposed basin surface areas. <br /> Asphalt Pedestrian Total Total <br /> Pavement Concrete Building Landscape Impervious Area <br /> (SF) (SF) (SF) (SF) (SF) (SF) <br /> Existing 151,818 8,763 43,115 14,745 203,696 218,441 <br /> [Proposed 132,552 12,589 22,787 50,513 167,928 218,441 <br /> There is no new impervious surfacing proposed for the site. The impervious surfacing is all <br /> replacement of existing pavement. Total amount of replaced impervious surfacing is <br /> approximately 35,770 square feet and is a net reduction compared to the existing condition. <br /> The following proposed On-site Stormwater Management BMPs used on the project will also <br /> provide water quality treatment for any pollution-generating impervious surfaces. The amount <br /> of bioretention surface area has been maximized to the extent feasible based on topography, <br /> parking stall requirements, and landscaping requirements. See Appendix B for bioretention cell <br /> sizing calculations. <br /> Stormwater Site Plan 9 <br /> Learning Resource Center <br />