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City of Santa Ana Environmental Checklist c. Requite or result in the construction of new storrnwater• drainage facilities or expansion of existing facilities, the construction of which could cause significant environmental effects? Less-than-Significant Impact. The project site does not include any stor•mwater drainage facilities and stormwater sheet flows from the site to existing six-inch concrete curb and gutter along the east side of Sullivan Street. The project site is currently 60% impervious and would increase to 91.7% as a result of the proposed project. The proposed project building would be located in the middle of the site with driveways on the north and south side, and parking in the rear with a surrounding landscape area. The project site includes grassy swales along northern and southern property line to reduce stormwater runoff and to provide a biotreatment BMP pursuant to the Orange County Low Impact Development (LID). The swales are designed to accommodate the site drainage and will have a two-foot bottom width and a 3:1 side slope within a four-foot wide area adjacent to the project perimeter wall. Stormwater will sheet flow to each side of the building where gutters along the ground and roof of the building will convey storrnwater toward the grassy swales. In addition to the swales, runoff that is captured by the driveway ramps or parking garage will be intercepted by drain inlets and pumped it to the sanitary sewer, thereby not draining offsite. This is further described in the Drainage Study, included as Appendix C. Because the proposed grassy swales and other onsite drainage are designed to accommodate onsite stormwater, new or expanded offsite drainage facilities would not be required to accommodate the proposed project, and impacts would remain less than significant, d. Have sufficient water supplies available to serve the project from existing entitlements and resources, or would new or expanded entitlements be needed? Less-than-Significant Impact. Domestic water for the proposed project would be provided by the Water Resources Division of the City of Santa Ana Public Works Agency. In 2010, the City of Santa Ana received 62% of its water from the Orange County Groundwater Basin, which is delivered to the City by the OCWD. The remaining 38% is imported water that was purchased from Metropolitan (City of Santa Ana 2010). The City also receives recycled water after advanced treatment from the OCWD facility, Green Acres Project. These recycled supplies can offset the demand for potable water supplies. Water use and availability is detailed in Urban Water Management Plans (UWMPs), which are required to be updated every 5 years to provide estimates of current water usage and typically project water use over a 25- to 30-year period. Santa Ana's most recent UWMP was prepared and adopted in November 2005. At that time, the City maintained 444 miles of transmission and distribution mains, 8 reservoirs with a storage capacity of 49.3 million gallons, 7 pumping stations, 19 wells, and 7 import connections. Also, the amount of annual water use for the 2005 fiscal year was 44,920 acre-feet a year (afy), which was below the available 48,722 afy of supply for that year. Table 3-24 shows the UWMP's projected supply and demand until 2030 for normal and single-dry water years, as well as multiple dry years for the following five year periods: 2011-2015, 2016- 2020, 2021-2025, and 2025-2030. As shown in Table 3-24Tabie 3-, the City of Santa Ana is projected to have a water surplus each reporting year. The smallest surplus for the City is projected to occur during a single dry water year for 2030, which is estimated at 2,460 afy. As stated above in Response (b), the proposed project would require 3,056 gallons per day (gpd) or approximately 2.89 afy. This is approximately 2.36 afy more than the existing conditions. In comparison to the UWMP 2015 projections of 37,120 afy of groundwater supplies and 20,140 afy of The Bat Nha Buddhist Meditation Center 3 93 June 2013 Initial Study/Mitigated Negative Declaration ICf 00215.12 31C-148