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City of Santa Ana California Environmental Quality Act Initial Study/Mitigated Negative Declaration - 27 - 3.10 Hydrology and Water Quality Would the project: Environmental Issue Potentially Significant Impact Less Than Significant with Mitigation Incorporated Less Than Significant Impact No Impact a) Violate any water quality standards or waste discharge requirements or otherwise substantially degrade surface or ground water quality? X b) Substantially decrease groundwater supplies or interfere substantially with groundwater recharge such that the project may impede sustainable groundwater management of the basin? X c) 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: i) result in substantial erosion or siltation on- or off- site; X ii) substantially increase the rate or amount of surface runoff in a manner which would result in flooding on- or offsite; X iii) 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; or X iv) impede or redirect flood flows? X d) In flood hazard, tsunami, or seiche zones, risk release of pollutants due to project inundation? X e) Conflict with or obstruct implementation of a water quality control plan or sustainable groundwater management plan? X Discussion: a) The proposed Project is not expected to significantly violate water quality standards, waste discharge requirements, or surface and groundwater quality. Construction activities will comply with regulations set forth by the Federal Clean Water Act, the Santa Ana Regional Water Quality Control Board (SARWQCB), Orange County, the City of Santa Ana, and other relevant water quality control City Council 15 – 80 12/2/2025