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ATTACHMENT A Scope of Work for Tri-valley Potable Reuse Feasibility Study On behalf of the Tri-Valley Water Agencies,Zone 7 of the Alameda County Flood Control and Water Conservation District(Zone 7 Water Agency or Zone 7) is contracting with Carollo Engineers (Consultant)to complete a feasibility study of potable reuse. As the water wholesaler for the Livermore- Amador Valley,also commonly referred to as the Tri-Valley,Zone 7 Water Agency(Zone 7)supplies treated water to four retail water supply agencies(Retailers): California Water Service Company- Livermore District(Cal Water), Dublin San Ramon Services District(DSRSD),City of Livermore (Livermore),and City of Pleasanton(Pleasanton).This project will be a joint effort by the Tri-Valley Water Agencies. The primary goals of this study are to evaluate the feasibility of potable reuse for the Valley;to identify the most promising options based on technical,financial,and regulatory considerations;and,assuming that potable reuse is found to be feasible,to recommend next steps for the agencies. The options to be evaluated further include groundwater recharge/injection,surface water augmentation,and connection upstream of the Zone 7 WTPs;direct connection to the water transmission system is not being considered at this time.The findings and recommendations from the study will be presented to the governing bodies of the Tri-Valley Water Agencies for their consideration and potential actions. SCOPE OF WORK Task 1 -Literature Review: Task 1.1 Industry Overview- TM1 • Provide overview of key potable reuse projects in California and other states including project description,project phase,time in operation,challenges/successes. • Summarize emerging trends/technologies in potable reuse. Deliverable: Draft technical memorandum(TM 1)to be provided at the kickoff meeting that summarizes the state of potable reuse, based on work performed for other projects and industry texts.Comments received on the Draft TM will be incorporated into the Draft Report. Task 1.2 Review Background Documents a Review relevant documents prepared by Zone 7,the Retailers,and/or their consultants.All documents to be reviewed will be provided by Tri-Valley Water Agencies. Task 2-Public Health and Regulations: Task 2.1 Summary of Regulations and Treatment- TM 2 • Summarize current regulatory framework for potable reuse and the required treatment to meet the regulations.