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substantially with groundwater recharge. (Impact 4.6-2: Less Than Significant without <br />mitigation with mitigation) <br />• Development under the Transit Zoning Code (SD 84A and SD 84B) could alter the <br />existing drainage pattern of the area and potentially result in erosion and siltation. <br />(Impact 4.6-3: Less Than Significant) <br />• Future development in the Transit Zoning Code (SD 84A and SD 84B) could alter the <br />existing drainage pattern and potentially result in increased downstream flooding through <br />the addition of impervious surfaces, or exceeding the capacity of existing or planned <br />stormwater drainage systems. (Impact 4.6-4: Less Than Significant with mitigation) <br />TZC EIR Mitigation Measures <br />MM4.6-1 In order to comply with the current version of the Drainage Area Master Plan (DAMP), <br />future development projects in the Transit Zoning Code (SD 84A and SD 84B) area shall <br />prepare Storm Drain Plans, Stormwater Pollution Prevention Plans (SWPPP), and Water <br />Quality Management Plans (WQMP) conforming to the current National Pollutant Discharge <br />Elimination System (NPDES) requirements, prepared by a Licensed Civil Engineer or <br />Environmental Engineer, shall be submitted to the Public Works Agency for review and <br />approval. <br />a. A SWPPP shall be prepared and updated as needed during the course of construction to <br />satisfy the requirements of each phase of the development. The plan shall incorporate all <br />necessary Best Management Practices (BMPs) and other City requirements to eliminate <br />polluted runoff until all construction work for the project is completed. The SWPPP shall include <br />treatment and disposal of all dewatering operation flows, and for nuisance flows during <br />construction. The SWPPP may include, but would not necessarily be limited to, the following <br />applicable measures: <br />o Minimum required pavement widths for residential streets needed to comply with all <br />zoning and applicable ordinances <br />o Use permeable materials for private sidewalks, driveways, parking lots, or interior <br />roadway surfaces <br />o Reduce the overall imperviousness associated with parking lots by using pervious <br />materials in spillover parking areas <br />o Direct rooftop runoff to pervious areas and avoid routing rooftop runoff to the roadway or <br />the stormwater conveyance system <br />o Biofilters including vegetated swales and strips <br />o Extended/dry detention basins <br />o Infiltration basin <br />o Infiltration trenches or vaults <br />o Catch basin inserts <br />o Continuous flow deflection/separation systems <br />o Storm drain inserts <br />o Media filtration <br />o Foundation planting <br />o Catch basin screens <br />o Normal flow storage/separation systems <br />o Clarifiers <br />o Filtration systems <br />o Primary waste water treatment systems <br />January 2025 34 Environmental Analysis <br />