31B - CUP - 1901 NORTH FAIRVIEW ST

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City of Santa Ana Environmental Checklist excavations would be limited to 5 feet below the existing grade, it is not anticipated that groundwater would be encountered during construction. Furthermore, implementation of the SWPPP (as described above) would prevent runoff, contaminated soils, or construction contaminants from entering excavated areas. Therefore, no impacts related to water quality standards would occur from implementation of the proposed project. Operational Impacts The City is a copermittee under the Orange County Municipal National Pollutant Discharge Elimination System (NPDES) Permit for the Santa Ana Region, Orders No. 118- 2009 -0030 and 1.8- 2010 -0062 (NPDES No. CAS618030; Santa Ana RWQCB 2003). To implement the requirements of the Municipal Separate Storm Water System (MS4) Permit, a Drainage Area Master Plan (DAMP) was developed to provide a framework and a process for following the MS4 Permit requirements to incorporate watershed protection /stormwater quality management principles into the environmental review and development permit approval processes. Per the requirements in the DAMP and the MS4 Permit, the City has adopted a Local Implementation Plan (LIP) implementing the DAMP and MS4 Permit within the city limits. 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. Specifically, the project's water pollution control measures include installation of a bioretention system and permeable pavers to treat onsite stormwater. The bioretention system will be a soil and plant -based filtration device that removes pollutants. It typically consists of a grass buffer strip, sand bed, ponding area, organic layer or mulch layer, planting soil and plants. Permeable paving is comprised of impermeable blocks separated by spaces and joints, through which water can drain. Pervious paving reduces runoff volume while filtering flows. As a result of compliance with existing regulations and implementation of BMPs, operational impacts related to the violation of water quality standards or waste discharge requirements would be less than significant. The Academy Charter High School 3 -56 June 2012 Initial Study /Mitigated Negative Declaration 1CF 00914.11 L