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

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L S A FAIRVIEW BRIDGE REPLACEMENT AND STREET IMPROVEMENTS (9TH STREET TO 16TH STREET( PROJECT INITIAL STUDY/MITIGATED NEGATIVE DECLARATION SANTA ANAL CALIFORNIA MAY 2020 (GSAs), which are required to adopt Groundwater Sustainability Plans to manage the sustainability of the groundwater basins. SIGMA provides authority for agencies to develop and implement groundwater sustainability plans (GSPs) or alternative plans that demonstrate the basin is being managed sustainably. The Project site is located within the Coastal Plain of Orange County Groundwater Basin (Basin 8-1), which underlies the Lower Santa Ana River Watershed. For regulatory purposes, the Santa Ana RWQCB divides the Coastal Plain of Orange County Groundwater Basin into three Groundwater Management Zones. The Project area is within the Orange County Groundwater Management Zone. On January 1, 2017, the Orange County Water District, City of La Habra, and Irvine Ranch Water District submitted the Basin 8-1 Alternative to the California Department of Water Resources. The Basin 8-1 Alternative presents an analysis of basin conditions that demonstrates that Basin 8-1 has operated within its sustainable yield over a period of at least 10 years. In addition, the Basin 8-1 Alternative establishes objectives and criteria for management that would be addressed in a GSP and is designed to be "functionally equivalent" to a GSP. As shown in the Basin 8-1 Alternative, Basin 8-1 has been operated within its sustainable yield for more than 10 years without experiencing significant and unreasonable lowering of groundwater levels, reduction in storage, water quality degradation, seawater intrusion, inelastic land subsidence, or depletions of interconnected surface water that have significant and unreasonable adverse impacts on beneficial uses of the surface water.41 As discussed in Response 3.10.2(a), with implementation of Mitigation Measures HYDRO-1 through HYDRO-3, the proposed Project would comply with the Construction General Permit and Municipal NPDES Permit and implement construction and operational BMPs to reduce impacts to water quality. The proposed Project's adherence to the regulatory standards and implementation of BMPs would ensure that potential construction and operational impacts related to the degradation of water quality would be less than significant. Therefore, the proposed Project would not conflict with or obstruct implementation of a water quality control plan with implementation of Mitigation Measures HYDRO-1 through HYDRO-3. The proposed Project would not substantially deplete groundwater supplies or interfere with groundwater recharge; therefore, it would not obstruct or conflict with a sustainable groundwater management plan, and no mitigation is required. 3.10.3 Mitigation Measures Mitigation Measure HYDRO-1 Construction General Permit. Prior to commencement of construction activities, the City of Santa Ana (City) Public Works Director or designee shall obtain coverage under the National Pollutant Discharge Elimination System (NPDES) General Permit for Storm Water Discharges Associated with Construction and Land Disturbance Activities (Construction General Permit) NPDES No. CAS000002, Order No. 2009-0009-DWQ, as amended by Order No. 2010-0014-DWQ and Order No. 2012-0006-DWQ, or any other 41 Orange County Water District, City of La Habra, and Irvine Ranch Water District. 2017. Basin 8-1 Alternative. January 1. Website: https://www.ocwd.com/media/4918/basin-8-1-alternative-final-report- 1.pdf (accessed November 2019). 3-64 76"&ND\FinalISMND\Fairview Street Bridge Final ISMND.docx(OS/26/20)