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

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Explanation of the Rationale: Construction of the Project would require demolition of the existing building structures, including foundations, floor slabs, and utilities systems and excavation for subterranean parking structures which could temporarily alter the existing drainage pattern of the site and could result in flooding on- or offsite. However, drainage would be controlled because the Project would comply with the Construction General Permit and Groundwater Discharge Permit.With adherence to the applicable permits and 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 result in substantial erosion or siltation on- or off-site. The Project's grading and storm drain network would be designed to match existing drainage and flow patterns and would integrate bio-filtration methods, pervious surfaces, and selective plant materials to encourage on-site water retention. The Project would incorporate BMPs and LID measures following the local MS4 Permit requirements (RR HYD-4) and Orange County Technical Guidance Document; comply with the Santa Ana Municipal Code (RR HYD-5) and the Construction General Permit (RR HYD-1); and prepare a WQMP to reduce impacts related to erosion or siltation. Therefore, the Project would not substantially alter the existing drainage pattern of the site or area in a manner which would result in substantial erosion or siltation on- or off-site. Impacts would be less than significant. (Draft Supplemental EIR, pp. 4.7-16--4.7-17.) Threshold HYD-3(ii): 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 substantially increase the rate or amount of surface runoff in a manner which would result in flooding 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 flooding from surface runoff.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. 4.7-17—4.7-18.) Explanation of the Rationale: As previously discussed, the Project would adhere to the applicable permits and implementation of 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 erosion or siltation on- or off-site. Due to the high podium building drainage demand and the presence of multiple subterranean garage entrances, on-site drainage systems would be sized to contain the 100-year storm hydraulic grade line below the proposed finished surface to address the existing ponding issues. The Project's grading and storm drain network design would ensure surface runoff, including ponding water at the public driveways, would not result in flooding on-and off-site. Impacts would be less than significant. (Draft Supplemental EIR, pp. 4.7-17—4.7-18.) Threshold HYD-3(N): 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 create or contribute runoff water which would exceed the capacity of existing or planned stormwater drainage systems or provide substantial additional sources of polluted runoff. Resolution No. 2025-041 Page 42 of 140