2019-113 - Mainplace Mall Mixed-Use Project

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of Santa Ana 4 Water Setting MainPlace Mall Transformation Project Water Supply Assessment The following information is taken mainly from the 2015 UWMP and is the latest information available. 4.1 City of Santa Ana Water Supply The City of Santa Ana Water Department service area covers approximately 100 percent of the City and a small portion of the neighboring City of Orange. Its two combined sources of water supply are local groundwater contained in the Lower Santa Ana River Groundwater Basin, also known as the Orange County Groundwater Basin (OC Basin), which is managed by the Orange County Water District (OCWD) and imported water from MWD. In 1933, the OCWD was formed by a special act of the State Legislature to manage Orange County's groundwater supply and protection of the County's rights to water in the Santa Ana River. In 1953, the City became a member of OCWD. There are 21 water wells serving the City. Additionally, there are 10 reservoirs with a combined capacity of 49.3 million gallons. Currently, the City relies on approximately 71 percent groundwater, 28 percent imported water, and 1 percent recycled water. The City's water supply portfolio is expected to change slightly to 70 percent groundwater, 29 percent imported water, and 0.7 percent recycled water by the year 2040. 4.2 Retail Water Supply Retail water in the City of Santa Ana is purchased through MWD which obtains water from several sources, including local groundwater, surface water, recycled water and water supplied through the State Water Project and Colorado River Aqueduct. The State Water Project is a series of reservoirs, aqueducts and pumping facilities that transport water from Northern California to Southern California. The City maintains seven imported water connections to receive water through MWD's Orange County and East Orange County Feeder pipelines. Seven metered connections with a total capacity of 60,580 gallons per minute (gpm) transfer water into the City's distribution system. MWD's principal sources of water are the Colorado River via the Colorado River Aqueduct and the Lake Oroville watershed in Northern California through the State Water Project. The water obtained from these sources is treated at the Robert B. Diemer Filtration Plant located north of the City of Yorba Linda. Typically, the Diemer Filtration Plant receives a blend of Colorado River water from Lake Mathews through the MWD Lower Feeder and State Water Project water through the Yorba Linda Feeder. The City currently maintains seven imported water connections to the MWD system. Section 3.2.1 of the UWMP describes MWD's rights to Colorado River water, the forecasted supply and demand of Colorado River water, and management principles under consideration to better balance the supply and demand of Colorado River water. Section 3.2.2 of the UWMP describes the State Water Project that forms the second source of water for MWD. Policy and environmental factors affecting supply and reliability are listed. Storage is a major component of MWD's dry year resource management strategy. Sections 3.2.3 of the UWMP described Lake Oroville, the State Water Project's largest storage facility. Kimley»)Horn 55 -20 Page 112