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City of Santa Ana Environmental Checklist Threat to Water Quality (Order Number RB-2009-0003 NPDES Number CAG998001; Santa Ana RWQCB 2003). If dewatering activities would discharge into the local or regional sanitary sewer system, a permit from the OCSD will be required prior to discharge activities. Operational Impacts The Orange County Waste Discharge Requirements for operational urban runoff (referred to as "MS4 permits" issued by the Santa Ana and San Diego Regional Water Quality Control Boards (Order No. R8-2009.0030 and R8.2010.0062, respectively) require the County of Orange and the City as a copermittee to mandate a Water Quality Management Plan (WQMP) for all new development and significant redevelopment projects. As described above, the City is a copermittee under the Orange County NPDES Permit for the Santa Ana Region. In addition, the DAMP and the LIP are enforced by the City of Santa Ana's Water Pollution Regulations (Section 18, Article 4 of the City's Municipal Code). The DAMP establishes a baseline set of BMPs focusing on improving water quality for receiving waters in Orange County. Under the DAMP, the proposed project is considered a priority project because the project will replace more than 5,000 square feet of impervious surface and more than 50% of the impervious surface on the site. As a priority project, the project applicant would be required to prepare a Water Quality Management Plan (WQMP) and incorporate all source-control BMPs. Using the LIP as a guide, the applicant has prepared a WQMP for the proposed project. The WQMP targets control of pollutants in runoff typically produced by the proposed project's land use (e.g., sediment, nutrients, trash and debris, oxygen-demanding substances, oil and grease, bacteria, and pesticides) to reduce impacts on water quality during project operation. As of August 17, 2011, all WQMPs must conform to the requirements outlined within the 2011 Model WQMP established by the Santa Ana RWQCB. As required by existing regional regulations being implemented by the City, the proposed project would comply with all BMPs and design specifications required in the WQMP to minimize runoff and erosion impacts that could result in a violation of water quality standards or waste discharge requirements. The project includes long grassy swales along the northern and southern project boundaries to provide filtration by biotreatment BMPs per the LIP to reduce and filter stormwater runoff. The swales are designed to accommodate the site drainage and will have a two-foot bottom width and a 3:1 side slope within a 4-Foot-wide area adjacent to the project perimeter wall. The stornwater runoff that is captured by the driveway ramps or parking garage area will be intercepted by garage drain inlets and filtered prior to pumping it to the sanitary sewer. In addition, the rear parking area stormwater will be intercepted by drain inlets and filtered before outlet by three-inch drainage pipe to Sullivan Street. As a result of compliance with existing regulations and implementation of the BMPs described, operational impacts related to the violation of water quality standards or waste discharge requirements would be less than significant b. Substantially deplete groundwater supplies or, Interfere substantially with groundwater recharge, resulting Ina net deficit in aquifer volume at- a lowering of the local groundwater table level (e.g., the production rate of pre-existing nearby wells would drop to a level that would riot support exisdgq land uses or planned uses for which permits have been granted)? Less-than-Significant Impact. The City of Santa Ana is a member agency of the Orange County Water District (OCWD), which provides the City of Santa Ana with approximately 62% of its water front the Orange County Groundwater Basin. The remaining 38% of the City's water demand is The Bat Nha Buddhist Meditation Center 3-S4 June 2013 Initial Study/Mitigated Negative Declaration ICE 00215.12 31 C-107