14 ATTACHMENT 1 EXHIBIT A - Laserfiche WebLink

Chapter 6 Water Supply Characterization THE CITY OF PL£ASANTON quality. MFUV construction was completed in 1999. The MFUV project is currently producing recycled water that meets California Title 22 requirements for unrestricted reuse and received approval for groundwater recharge from the California Department of Public Health, which has transitioned to the SWRCB Division of Drinking Water, and RWQCB. As described further in Section 6.2.8, potable reuse projects remain a potential option for the Tri -Valley. Zone 7 and the other retailers will be studying this option. The City has currently elected not to participate in studying potable reuse. Wastewater that is not recycled is discharged into the San Francisco Bay through a pipeline owned by LAVWMA, a joint powers agency created in 1974 by DSRSD, Livermore, and the City. Operations began in September 1979, with an expansion in 2005, for a current design capacity of 41.2 MGD. The wastewater is conveyed via a 16 -mile pipeline from the City to San Leandro and enters the EBDA system for dechlorination and discharge through a deepwater outfall to the San Francisco Bay. 6.2.5.2.2 Livermore Water Reclamation Plant Livermore owns and operates the LWRP, which treats wastewater collected from Livermore, Lawrence Livermore National Laboratory, and the City's Ruby Hills housing development. From 2018 to 2020, the LWRP received an average daily dry weather flow of approximately 5.4 MGD. Wastewater is treated using conventional primary and secondary wastewater treatment processes, as well as tertiary treatment to produce recycled water. The conventional wastewater treatment processes at the LWRP consist of the following: • Primary sedimentation where heavy organic solids are removed from the raw sewage and sent to solids stabilization and dewatering facilities • Secondary treatment utilizing the activated sludge process, which removes 85 to 95 percent of the remaining organic material after primary sedimentation • Disinfection using sodium hypochlorite to reduce the bacteria levels in the secondary effluent prior to disposal • Disposal of secondary effluent through the LAVWMA pipeline • Solids stabilization using anaerobic digestion followed by belt pressing for dewatering prior to beneficial reuse as alternate daily cover or land application Tertiary treatment for water reclamation consists of the following: • Mono -media filters, where 95 to 99 percent of suspended material is removed from secondary effluent • Disinfection using ultraviolet light (UV) prior to disposal The tertiary treated effluent that satisfies California Title 22 requirements for unrestricted water reuse is recycled through landscape irrigation. From 2018 to 2020, 2.0 MGD was recycled on average. While the tertiary filtration capacity of the LWRP is approximately 10 MGD, the overall recycled water production capacity is limited by the UV disinfection capacity to 6 MGD. 6.2.5.2.3 Wastewater Treatment and Discharge Within Service Area Table 6-3 summarizes wastewater collected within the City's service area in 2020. This includes wastewater sent to the RWTF and the LWRP. WEST YOST 6-18 City of Pleasanton 2020 Urban Water Management Plan N-680-60-20-04-wP-a-680-2020uwMP May 2021