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impacts to hazards and hazardous materials would be less than significant. (Draft Supplemental <br /> EIR, pp. 4.6-25—4.6-26.) <br /> 4.10 HYDROLOGY AND WATER QUALITY <br /> Threshold HYD-1: The Project would not violate any water quality standards or waste <br /> discharge requirements or otherwise substantially degrade surface or <br /> ground water quality. <br /> Findings: The City finds that the Project would result in less than significant impacts to hydrology <br /> and water quality related to water quality standards or waste discharge requirements violations. <br /> (Draft Supplemental EIR, pp. 4.7-11 —4.7-14.) <br /> Additionally, the City finds that the Project will implement the following regulatory requirement <br /> (Draft Supplemental EIR, pp. 4.7-5—4.7-6): <br /> RR HYD-1: All development pursuant to the General Plan Update shall comply with the <br /> requirements of the Construction General Permit (Order No. 2022-0057-DWQ) for <br /> stormwater discharges associated with construction activity. Compliance requires filing a <br /> Notice of Intent, a Risk Assessment, a Site Map, a Storm Water Pollution Prevention Plan <br /> and associated best management practices, an annual fee, and a signed certification <br /> statement. <br /> RR HYD-4: All development pursuant to the General Plan Update shall comply with the <br /> requirements of the Orange County MS4 Permit (Order R8-2009-0030, NPDES No. <br /> CAS618030, as amended by Order No. R8-2010-0062). The MS4 Permit requires new <br /> development and redevelopment projects to: <br /> • Control contaminants into storm drain systems <br /> • Educate the public about stormwater impacts <br /> • Detect and eliminate illicit discharges <br /> • Control runoff from construction sites <br /> • Implement best management practices and site-specific runoff controls and <br /> treatments for new development and redevelopment <br /> RR HYD-5: All development pursuant to the General Plan Update shall comply with the <br /> requirements detailed in Chapter 18 Article IV of the Santa Ana Municipal Code. <br /> Explanation of the Rationale: Construction activities associated with the Project have the <br /> potential to result in the conveyance of soils and other pollutants due to soil erosion during grading <br /> and soil stockpiling and subsequent siltation into municipal storm drains. However, construction <br /> activities would comply with requirements of the Construction General Permit(as required by RR <br /> HYD-1), including a project specific SWPPP and associated best management practices (BMPs). <br /> Construction dewatering discharges would comply with the requirements of the Santa Ana <br /> RWQCB's Groundwater Discharge Permit, which requires sampling and treatment measures as <br /> Resolution No. 2025-041 <br /> Page 40 of 140 <br />