75B - PH ADOPT RESO FOR PR NO 15-6827

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NT MENTS INITIAL STUDY/MITIGATED NEGATIVE DECLARATION FAIRVIEW BPIOGE REVLACEM REST TO STREET BEET) PROJECT L S A MAY 2020 (9Tx STREET To ANTx STREET) L, OLEGT SANTA ANAL CALIFOPHIA polluted runoff would be discharged. Because BMPs would reduce introduction of pollutants, there would be a low potential for pollutants to be released from the Project site in the unlikely event of levee failure and inundation of the Project site. Therefore, with implementation of Mitigation Measures HYDRO-1 and HYDRO-3, the proposed Project would not risk release of pollutants due to Project inundation. This impact would be less than significant with mitigation incorporated. e. Would the project conflict with or obstruct implementation of a water quality control plan or sustainable groundwater management plan? Less Than Significant Impact with Mitigation Incorporated. The proposed Project is within the jurisdiction of the Santa Ana RWQCB. The Santa Ana RWQCB adopted a Water Quality Control Plan (i.e., Basin Plan) that designates beneficial uses for all surface and groundwater within its jurisdiction and establishes the water quality objectives and standards necessary to protect those beneficial uses. As summarized below, the Project would comply with the applicable NPDES permits and would implement construction and operational BMPs to reduce pollutants of concern in storm water runoff. As discussed in Response 3.10.2(a), during construction activities, excavated soil would be exposed, and there would be an increased potential for soil erosion and sedimentation compared to existing conditions. In addition, chemicals, liquid products, petroleum products (e.g., paints, solvents, and fuels), and concrete -related waste may be spilled or leaked and have the potential to be transported via storm water runoff into receiving waters. As specified in Mitigation Measure HYDRO-1, the proposed Project would be required to comply with the requirements set forth by the CGP, which require preparation of a SWPPP and implementation of construction BMPs to control storm water runoff and discharge of pollutants. As discussed in Response 3.10.2(a), expected pollutants of concern during operation of the proposed Project include suspended solids/sediment, nutrients, heavy metals, pathogens (bacteria/viruses), pesticides, oil and grease, toxic organic compounds, and trash and debris. The pollutants of concern for the Project are metals and oil and grease. As required by Mitigation Measure HYDRO-3, a final WQMP would be prepared for the Project in compliance with the North Orange County MS4 Permit. The Final WQMP will detail the Site Design/LID, Source Control, and/or Treatment Control BMPs that would be implemented to treat storm water runoff and reduce impacts to water quality during operation. The proposed BMPs would capture and treat storm water runoff and reduce pollutants of concern in storm water runoff. The proposed Project would comply with the applicable NPDES permit, which requires preparation of a SWPPP, preparation of a Final WQMP, and implementation of construction and operational BMPs to reduce pollutants of concern in storm water runoff. As such, the Project would not result in water quality impacts that would conflict with the Basin Plan. Impacts related to conflict with a water quality control plan would be less than significant, and no mitigation is required. The Sustainable Groundwater Management Act (SGMA) was enacted in September 2014. SIGMA requires governments and water agencies of high- and medium -priority basins to halt overdraft of groundwater basins. SIGMA requires the formation of local Groundwater Sustainability Agencies R:\WKE1702\ISMND\Fina1 ISMND\Fairview Street Bridge Final ISMN07,058"9 7 3-63