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City of Santa Ana Addendum to the <br />MainPlace Mall Transformation Project Fashion Square Commercial Center Final EIR <br />Table PSU-1: Estimated Water Demand at Project Buildout <br />Use <br />Number <br />Demand <br />Rate d <br />Total <br />Demand <br />d <br />Multi -family Residential du <br />1900 <br />190 <br />361000 <br />Hotel rooms <br />400 <br />180 <br />72,000 <br />Commercial acres <br />47.6 <br />2,500 <br />119,000 <br />Total <br />552,000 <br />618 AFY <br />Source: vvater Supply Assessment, 1u19 <br />du = dwelling units, gpd = gallons per day, AFY = acre-feet yearly <br />The WSA includes conservative assumptions that the Project would be 60 percent <br />developed by 2025 and would be built out and operational by 2030. The WSA compares <br />these buildout assumptions to the City's estimated increases in water demands. As <br />shown on Table PSU-2, based on the analysis in the WSA, the City has ample water <br />supply in 2025, 2030, 2035, and 2040 to meet the demands of buildout of the proposed <br />Project and the rest of the City's anticipated water demand. Therefore, consistent with <br />the 1983 EIR and 1996 Addendum, impacts related to water would be less than <br />significant. <br />Table PSU-2: Estimated Water Demand at Project Buildout (AFY) <br />2025 <br />2030 <br />2035 <br />2040 <br />UWMP Estimated Demand <br />39,397 <br />39,669 <br />39,658 <br />39,716 <br />UWMP Accumulative Demand <br />2,742 <br />3,014 <br />3,003 <br />3,061 <br />Proposed Project Demand <br />371 <br />618 <br />618 <br />618 <br />Other Project Demands <br />1,084 <br />1,522 <br />1,716 <br />1,716 <br />Proposed Project + Other <br />Project Comparison with <br />UWMP Accumulative Demand <br />1,658 <br />1,492 <br />1,287 <br />1,345 <br />Source: Water Supply Assessment, 2019 <br />AFY = acre-feet yearly <br />Sewer <br />The following discussion is based on information from the Sanitary Sewer Capacity <br />Study prepared for the Project (Sewer 2019) and included as Appendix I. The Project <br />site currently contains an existing sewer system that generally flows into a 15-inch <br />sewer line in Main Place Drive, and then to a 30-inch trunk sewer line at the 1-5 that <br />connects to a 78-inch diameter regional trunk sewer that conveys sewage southerly, <br />ultimately outfalling at the Orange County Sanitation District (OCSD) wastewater <br />reclamation facility in Fountain Valley. The wastewater reclamation facility processes <br />approximately 117 million gallons per day (MGD) of wastewater. <br />Similar to the Originally Approved Plan, the proposed Project would result in an <br />increased generation of wastewater. As shown on Table PSU-3, buildout of the <br />proposed Project would result in an average flow rate of 1.29 cubic feet per second (cfs) <br />and a Peak Flow of 3.87 cfs. <br />147 <br />