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

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Findings: The City finds that the Project would result in less than significant impacts to hydrology and water quality related to stormwater drainage. 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. 4.7-19—4.7-20.) Explanation of the Rationale: As previously discussed, the Project would adhere to applicable permits (e.g., Construction General Permit and Santa Ana RWQCB's Groundwater Discharge Permit, if necessary) and implement a project-specific SWPPP and associated BMPs; therefore, construction of the Project would not substantially alter the existing drainage pattern of the site or area in a manner which would result in substantial runoff water or polluted runoff. The Project grading and storm drain network would be designed to match the existing drainage and flow patterns to best utilize the capacities available in the existing public storm drain system and may use underground detention systems and/or on-site drainage systems to contain excess flows. The Project site would be required to implement bio-filtration as the primary water quality treatment method. During each phase of Project development, the associated localized drainage and water quality systems dedicated to each building site would be confirmed during the design permitting phase with the City and constructed with each building before connecting to the on-site backbone storm drain system. Therefore, the Project would not create or contribute runoff water, including ponding water, which would exceed the capacity of existing or planned stormwater drainage systems or provide substantial additional sources of polluted runoff. Impacts would be less than significant. (Draft Supplemental EIR, pp. 4.7-19—4.7-20.) Threshold HYD-3(iv): 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 impede or redirect flood flows. Findings: The City finds that the Project would result in less than significant impacts to hydrology and water quality related to flood flows. 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. 4.7-20—4.7-21.) Explanation of the Rationale:As discussed previously,with adherence to the applicable permits (e.g., Construction General Permit and Santa Ana RWQCB's Groundwater Discharge Permit, if necessary), implementation of a project-specific SWPPP and associated BMPs, construction of the Project would not substantially alter the existing drainage pattern of the site or area in a manner which would impede or redirect flood flows. Additionally, the Project site is not located within a Special Flood Hazard Area, defined as the area that will be inundated by the base flood or 100-year flood. Therefore, the potential for Project facilities to impede or redirect flood flows is considered low. Impacts would be less than significant. (Draft Supplemental EIR, pp. 4.7-20—4.7-21.) Threshold HYD-4: The Project would not, in flood hazard, tsunami, or seiche zones, risk release of pollutants due to project inundation. Findings:The City finds that the Project would result in less than significant impacts to hydrology and water quality related to flood hazard, tsunami, or seiche zones. Additionally, the City finds Resolution No. 2025-041 Page 43 of 140