2019-055 - Approving the Water Supply Assessment

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ELAN PROJECT WATER SUPPLY ASSESSMENT 2.1.1 Existing Water Use NOVEMBER 2, 2017 As mentioned, the existing land use of the Project is vacant at the northern portion of the Project with an existing hotel and parking at the middle and southern portions. The Elks Lodge area in the center of the site covers a footprint of approximately 86,000 sf. The Elks Lodge structures cover approximately 50,000 SF and has approximately 20,000 SF of existing landscaping. See Figure 2 for an aerial image of the existing land uses at the proposed Project site. The water demand factors from the City of Santa Ana Design Guidelines for Water and Sewer Facilities (March 2017)2 were utilized to establish an estimate of existing water demands at the Project site. A commercial water demand factor of 2,500 gallons per day (gpd) per acre was employed to account for Elks Lodge at the existing Project site. In addition, a landscape water demand factor of 3,000 gpd/acre was employed for the scattered landscaping at the Project site. See Table 2 below for estimated existing water demands and the Project site. Table 2 Existing Water Demands 6dsNng Land Land Use Square band Use Water Demand Fodor ELdsting Water E)dsflng Water Use Footage Acreage (gpd acre) " Demand (gpd) Demand (AFY) Elks Lodge 50,000 1.15 2,500 2,875 3.22 Landscaped Area 20,000 0.46 3,000 635 0.71 Total 70,000 1.61 3,510 3.93 Notes: d gallons per day AFY acre-feet per year As shown above, the estimated existing water use at the Project site is approximately 3,510 gallons per day (gpd) or 3.9 acre-feet per year (AFY). An estimated annual difference between existing water demands and proposed water demands resulting from the proposed Project are calculated and shown in Section 2.1.2 below. 2 City of Santa Ana Design Guidelines for Water and Sewer Facilities (March 2017). Found here: htip://www.santo-ano.org/pwa/documents/DesignGuidelines.pdf FUSCOE ENGINEERING, INC.