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November 8, 2024 Page 11 7357-013acp printed on recycled paper Projects. In particular, the combined environmental and public health impacts from construction and operation of the two projects at the same location are significant and must be analyzed in a single environmental review document to ensure that the full scope of impacts is disclosed and mitigated in compliance with CEQA. The Senior East County Lakes Project will add an additional 596 new residential units to parcel APN 946-4634-2, including a high density independent/assisted living facility, and associated facilities. The addition of the Senior East County Lakes Project at the same location as the Arroyo Lago Project will substantially increase the localized and regional air quality impacts, transportation impacts, GHG, noise and other impacts generated by the projects. The combined effects of the two projects must be analyzed together to accurately assess their severity and ensure that proposed mitigation measures reduce the combined local and regional effects of the projects to the greatest extent feasible. The addition of the Senior East County Lakes Project may also affect the design, location, feasibility, and capacity of the Arroyo Lago Project’s proposed offsite improvements. For example, the Arroyo Lago Project proposes to install a sewage treatment plant on parcel APN 946-4634-2 to handle wastewater from the Arroyo Lago residences. The Project design described in the Notice of Preparation (“NOP”) placed the sewage treatment plant far from the proposed residences.55 However, the Senior East County Lakes Project would place all 596 of its new residences on the same parcel as the sewage treatment plant, which could result in significant air quality and public health impacts to Senior East County Lakes Project residents and users. See DEIR, Exhibit 2-6a below. 55 See NOP, Exhibit 6, Proposed Offsite Improvements.