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2015 URBAN WATER MANAGEMENT PLAN <br />Recycled water opportunities have continued to grow in southern California as public acceptance and the <br />need to expand local water resources continues to be a priority. Recycled water also provides a degree of <br />flexibility and added reliability during drought conditions when imported water supplies are restricted. <br />Recycled water is wastewater that is treated through primary, secondary and tertiary processes and is <br />acceptable for most non - potable water purposes such as irrigation, and commercial and industrial <br />process water per Title 22 requirements. <br />6.1 Agency Coordination <br />The City does not own or operate wastewater treatment facilities and sends all collected wastewater to <br />OCSD for treatment and disposal. OCWD is the manager of the OC Basin and strives to maintain and <br />increase the reliability of the OC Basin through replenishment with imported water, stormwater, and <br />advanced treated wastewater. OCWD and OCSD have jointly constructed and expanded two water <br />recycling projects to meet this goal that include: 1) OCWD GAP and 2) OCWD GWRS. <br />6.1.1 OCWD Green Acres Project <br />OCWD owns and operates the GAP, a water recycling system that provides up to 8,400 AFY of recycled <br />water for irrigation and industrial uses. GAP provides an alternate source of water that is mainly delivered <br />to parks, golf courses, greenbelts, cemeteries, and nurseries in the Cities of Costa Mesa, Fountain Valley, <br />Newport Beach, and Santa Ana. Approximately 100 sites use GAP water, current recycled water users <br />include Mile Square Park and Golf Courses in Fountain Valley, Costa Mesa Country Club, Chroma <br />Systems carpet dyeing, Kaiser Permanente, and Caltrans. The City maintains an agreement with OCWD <br />to supply GAP water to customers where available. <br />6.1.2 OCWD Groundwater Replenishment System <br />OCWD's GWRS receives secondary treated wastewater from OCSD and purifies it to levels that meet <br />and exceed all state and federal drinking water standards. The GWRS Phase I plant has been operational <br />since January 2008, and uses a three -step advanced treatment process consisting of microfiltration (MF), <br />reverse osmosis (RO), and ultraviolet (UV) light with hydrogen peroxide. A portion of the treated water is <br />injected into the seawater barrier to prevent seawater intrusion into the groundwater basin. The other <br />portion of the water is pumped to ponds where the water percolates into deep aquifers and becomes part <br />of Orange County's water supply. The treatment process described on OCWD's website is provided <br />below (OCWD, GWRS, 2015). <br />GWRS Treatment Process <br />The first step of the treatment process after receiving the secondary treated wastewater is a separation <br />process called MF that uses hollow polypropylene fibers with 0.2 micron diameter holes in the sides. <br />Suspended solids, protozoa, bacteria and some viruses are filtered out when drawing water through the <br />holes to the center of the fibers. <br />arcadis.com <br />1316 6 -1 <br />