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4 NO ENVIRONMENTAL EFFECTS AND LESS THAN SIGNIFICANT <br />ENVIRONMENTAL EFFECTS WITHOUT MITIGATION MEASURES <br />that the Project will implement regulatory requirements RR HYD-1; RR HYD-4; and RR HYD-5 <br />(listed above). (Draft Supplemental EIR, pp. 4.7-21 — 4.7-22.) <br />Explanation of the Rationale: The Project site is not located within a Special Flood Hazard Area <br />and the risk of flood hazard is low. Tsunamis affect low-lying areas along the coastline. As the <br />Project site is located approximately 6 miles from the coastline, the risk of tsunami hazard is low. <br />The Project site is within the inundation area of the Santiago Creek and the Prado Dam. However, <br />as stated in the GPU PEIR, the USACE and DSOD have ongoing assessments and measures to <br />certify dam efficiencies, and Santiago Creek and Prado Dam are required to maintain EAPs, <br />which would help minimize property damage and loss of life in emergency conditions. Therefore, <br />the risk of project inundation is low. Impacts would be less than significant. (Draft Supplemental <br />EIR, pp. 4.7-21 — 4.7-22.) <br />Threshold HYD-5: The Project would not conflict with or obstruct implementation of a water <br />quality control plan or sustainable groundwater management plan. <br />Findings: The City finds that the Project would result in less than significant impacts to hydrology <br />and water quality related to conflict with a water quality control plan or sustainable groundwater <br />management plan. Additionally, the City finds that the Project will implement regulatory <br />requirements RR HYD-1; RR HYD-4; and RR HYD-5 (listed above). (Draft Supplemental EIR, <br />pp. 4.7-22 — 4.7-23.) <br />Explanation of the Rationale: The Project would adhere to the requirements of the Construction <br />General Permit, Orange County MS4 Permit, and the City's Municipal Code as required by RR <br />HYD-1, HYD-4, and HYD-5, to reduce impacts to surface and groundwater quality. Water supply <br />for the Project would be provided by connections to the existing City utility infrastructure and not <br />by groundwater wells. The project's projected water demand would be sufficiently accommodated <br />by the City's water supply. Therefore, the Project would not obstruct or conflict with a water quality <br />control plan or sustainable groundwater management plan. Impacts would be less than <br />significant. (Draft Supplemental EIR, pp. 4.7-22 — 4.7-23.) <br />Cumulative Impacts: The Project would not result in cumulative impacts concerning hydrology <br />and water quality. <br />Findings: The City finds that the Project would result in less than significant cumulative impacts <br />concerning hydrology and water quality. Additionally, the City finds that the Project will implement <br />regulatory requirements RR HYD-1; RR HYD-4; and RR HYD-5 (listed above). (Draft <br />Supplemental EIR, pp. 4.7-23 — 4.7-25.) <br />Explanation of the Rationale: <br />Similar to the Project, construction activities associated with GPU buildout and the related projects <br />have the potential to convey soils and other pollutants into municipal storm drains. During <br />operation of these projects, stormwater runoff from project sites could introduce or increase <br />pollutants that could runoff into municipal storm drains. However, as with the Project, projects <br />developed pursuant to the GPU and the related projects within the watersheds would be required <br />to implement water quality control measures pursuant to the NPDES General Construction <br />Permit, such as implementation of a SWPPP (for projects disturbing greater than one acre), a <br />City of Santa Ana The Village Santa Ana Specific Plan Project <br />August 2025 CEQA Findings of Fact and Statement of Overriding Considerations <br />4-24 <br />