2025-041 - Certifing Final Supplemental Enviromental Impact for The Village

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necessary to ensure groundwater discharges would not contain high levels of pollutants. Therefore, with compliance to the Construction General Permit and Groundwater Discharge Permit, the Project would not violate water quality standards or waste discharge requirements or otherwise substantially degrade surface or groundwater during construction, and construction- related impacts would be less than significant. The Project's storm drain network would be designed to match existing drainage and flow patterns to best utilize the capacities available in the existing public storm drain system. The Project would follow the requirements of the local MS4 Permit, as required by RR HYD-4, and the Orange County Technical Guidance Document and incorporate post-construction BMPs and low impact development(LID) measures in its project-specific water quality management plan (WQMP). The Project's WQMP must be reviewed and approved by the City to ensure it complies with the local MS4 Permit and Orange County DAMP regulations. Therefore, with incorporation of typical post- construction BMPs and LID measures and adherence to applicable permits, the Project would not violate water quality standards or waste discharge requirements or otherwise substantially degrade surface or groundwater during operation, and operational impacts would be less than significant. (Draft Supplemental EIR, pp. 4.7-11 —4.7-14.) Threshold HYD-2: The Project would not substantially decrease groundwater supplies or interfere substantially with groundwater recharge such that the project may impede sustainable groundwater management of the basin. Findings: The City finds that the Project would result in less than significant impacts to hydrology and water quality related to groundwater.Additionally,the City finds that the Project will implement regulatory requirements RR HYD-1; RR HYD-4; and RR HYD-5 (listed above). (Draft Supplemental EIR, pp. 4.7-14--4.7-15.) Explanation of the Rationale: Construction of the Project would require dewatering activities due to the Projects excavation for the proposed subterranean parking. However, dewatering activities would be temporary and would not substantially decrease groundwater supplies. Additionally, the Project would add a projected 339 acre-feet per year(AFY) of water demand in the current year, which is approximately 1 percent of overall City water demand. The City would have sufficient supply to meet the current and projected demand of the Project during normal, single-dry, and multiple-dry years. In single-dry and multiple-dry years, thus, the Project would not substantially decrease groundwater supplies. Further, because the Project site is already developed with paved surfaces, development of the Project would not interfere with groundwater recharge. Therefore, the Project would not substantially decrease groundwater supplies or interfere substantially with groundwater recharge. Impacts would be less than significant. (Draft Supplemental EIR, pp. 4.7-14—4.7-15.) Threshold HYD-3ffl: The Project would not substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river or through the addition of impervious surfaces, in a manner which would: result in substantial erosion or siltation on- or off-site. Findings: The City finds that the Project would result in less than significant impacts to hydrology and water quality related to substantial erosion or siltation. Additionally, the City finds that the Project will implement regulatory requirements RR HYD-1; RR HYD-4; and RR HYD-5 (listed above). (Draft Supplemental EIR, pp. 4.7-16—4.7-17.) Resolution No. 2025-041 Page 41 of 140