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November 8, 2024 Page 27 7357-013acp printed on recycled paper propose concurrent and potentially incompatible long-term uses on parcel APN 946- 4634-2 which may require the County to consider new project alternatives that were not identified in the Arroyo Lago NOP. The impacts of the two projects must be analyzed in the same EIR. At a minimum, the EIR must analyze and mitigate all reasonably foreseeable direct, indirect, and cumulative effects of the two projects the County identified as potentially significant, including: Aesthetics, Air Quality, Biological Resources, Cultural Resources, Energy, Geology and Soils, Greenhouse Gas Emissions, Hazards and Hazardous Materials, Hydrology and Water Quality, Land Use and Planning, Mineral Resources, Noise, Population and Housing, Public Services, Recreation, Transportation, Tribal Cultural Resources, Utilities and Service Systems, and Wildfire.138 The County must also analyze and mitigate any additional significant impacts which are identified during preparation of the EIR. Examples of two impact areas identified by responsible agencies during the NOP comment period are discussed below which require specific analysis in the EIR. 1. Water Supply The Arroyo Lago and Senior East County Lakes projects may have significant impacts on water supply, both individually and cumulatively, which must be analyzed in a water supply assessment (“WSA”) that is circulated for public review with the Draft EIR. The CEQA Guidelines and State Water Code require a WSA to be prepared for all “water-demand projects,” which includes, inter alia, residential developments of more than 500 dwelling units, a project that would demand an amount of water equivalent to, or greater than, the amount of water required by a 500 dwelling unit project, proposed residential or mixed use projects that would account for an increase of 10 percent or more in the number of a public water system's existing service connections for public water systems with fewer than 5,000 service connections.139 At 569 units, the Senior East County Lakes Project alone exceeds the 500-unit threshold requiring a WSA. Both the Senior East County Lakes and Arroyo Lago projects may individually exceed the 10 percent threshold for increasing water connections, and when considered together (763 units), the projects clearly exceed thresholds requiring a WSA. Under CEQA and the Water 138 NOP, p. 11. 139 14 Cal. Code Regs. § 15155(a); Water Code § 10910.