25C - AGMT - OCWD CENTENNIAL PARK

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Section 5 Resources Control Board (SWRCB) the permitting authority to implement the NPDES program. The State Water Resources Control Board issues two baseline general permits, one for industrial discharges and one for construction activities (General construction Permit). Additionally, NPIDES Program includes the long- term regulation of storm water discharge from medium and large cities (MS4 Permit), The County of Orange is the primary permit holder of the MS4 Permit and the City of Santa Ana is a co-permittee. Short-Term Storm Water Management Storm water discharges from construction sites with a disturbed area of one or more acres are required to either obtain individual NPIDES pert-nits for storm water discharges or be covered by a Construction General Permit, Coverage under the Construction General Permit requires filing a Notice of Intent with the State Water Resources Control Board and preparation of storm water pollution prevention plan (SWPPP). Each applicant under the Construction General Permit must ensure that a SWPPP would be prepared prior to grading and implemented during construction. The primary objective of the SWPPP is to identify, construct, implement, and maintain Best Management Practices (BMPs,) to reduce or eliminate pollutants in storm water discharges and authorized non -storm water discharges from the construction site during construction. BMPs include: programs, technologies, processes, practices, and devices that control, prevent, remove, or reduce pollution. Long-Term Storm Water Management The Mid Basin Centennial Wells Injection Well Project would be implemented in the City of Santa Ana. The City of Santa Ana is a co-permittee to the County of Orange NPIDES MS4 Storm Water Permit and is responsible for the implementation of the permit requirements. Under the NPIDES MS4 Storm Water Permit, construction projects are defined as Priority Projects or Non-Priority Projects based on the type of project and/or level of development intensity, Priority Projects Projects that are determined to be a Priority Project are required to prepare a Priority Project WQMP based on the County of Orange Model WQMP. The Priority Project WQMP is required to demonstrate that a project would be able to infiltrate, harvest, evapotranspire or otherwise treat runoff generated from an 85L" percentile storrn over a 24 hour period. The Model WQMP requires that Low Impact Development (LID) site design principles be incorporated into the project to reduce and retain runoff to the maximum extent practicable. Such LID site design principles include, but are not limited to, iminimizing impervious areas, and designing impervious areas to drain to pervious areas. M0 Basin Centennial Park j ,tdn VlProject Final EIR 5-101