14 ATTACHMENT 1 EXHIBIT A - Laserfiche WebLink

Chapter 6 Water Supply Characterization THE CITY OF PL£ASANTON Wastewater produced from the City's Ruby Hills housing development is sent to the LWRP. The City receives recycled water from Livermore for landscape irrigation servicing new development in the eastern portion of the City, referred to as the Staples Ranch region, which terminates at EI Charro Road. 6.2.5.1 Recycled Water Coordination In the early 1990s, DSRSD, Livermore, and Zone 7 undertook a Tri -Valley recycled water study and conducted a series of public workshops as a part of that process. As a result of that effort, the SWRCB issued a Master Water Recycling Permit (Order No. 93-159) to the three agencies in December 1993. The permit established the requirements for recycled water irrigation, groundwater recharge, and other Title 22 -approved projects. Zone 7 reviews DSRSD's recycled water plans from two perspectives—water supply management and groundwater protection. Recycled water is tertiary treated wastewater and is a very reliable supply; however, the use of recycled water was discouraged in the past due to the potential of salt buildup in the Main Basin. Developed in 2004, Zone 7's SMP identified demineralization with export of the brine stream as the best means of mitigating salt loading in the Main Basin. The SWRCB's 2009 Recycled Water Policy required the development of a Nutrient Management Plan, which Zone 7 completed in 2015. Zone 7 has incorporated a Salt and Nutrient Management Plan into the Groundwater Management Plan originally developed in September 2005. The City does not produce recycled water. It purchases tertiary, disinfected recycled water produced at DSRSD's RWTF and the LWRP. These two recycled water sources are described below. 6.2.5.1.1 DSRSD-EBMUD Recycled Water Authority (DERWA) Currently, wastewater from Dublin, the City, and the southern portion of San Ramon are treated at DSRSD's RWTF. A portion of the secondary effluent is routed to DSRSD's water recycling plant for tertiary treatment and distribution through DERWA facilities. DSRSD coordinates with the planning departments in the cities of Dublin and San Ramon, Alameda and Contra Costa counties, and the U.S. Army Reserve to ensure that recycled water is used where it is available. DSRSD and EBMUD work together to manage recycled water supply demands. The City and DSRSD each own 8.5 million gallons per day (MGD) of secondary treatment capacity at the DSRSD RWTF. The City maintains the first right to use the secondary effluent produced from wastewater originating from the City's wastewater collection system for recycling. DSRSD maintains the first right to use secondary effluent produced from the DSRSD collection system for recycling. According to the 2003 DERWA Water Sales Agreement, all recycled water produced by DSRSD is delivered to DERWA for subsequent wheeling to the EBMUD and DSRSD water service areas. DSRSD's tertiary treatment capacity is 16.2 MGD. Recycled water is delivered by DERWA on a first come first serve basis. DSRSD monitors recycled water uses and files reports with the SWRCB Division of Drinking Water and the San Francisco Bay RWQCB, in conformance with DSRSD's General Water Reuse Order No. WQ 2016- 0068-DDW (General Order 2016). The DERWA recycled water system has three components owned by three different agencies: DERWA owns the Pump Stations R1 (at the RWTF), R200B, and R200A, as well as Reservoirs R100 and R200. WEST YOST 6-16 City of Pleasanton 2020 Urban Water Management Plan May 2021