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Deliverable: Draft TM 2 to be provided at the kickoff meeting that summarizes the regulations and resulting public health protection 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 2.2 Policy Discussion of Public Health Goals • Facilitate policy-level discussions to determine the appropriate number of contaminant barriers for potable reuse options based on public health,regulatory,and engineering considerations. It is assumed that at the kickoff meeting,there will be a discussion of whether the Tri-Valley Water Agencies wish to add additional layers of public health protection goals. Any conclusions from this discussion will be added to the Draft Report. Task 3-Water Availability and Source Water Quality: Task 3.1 Within Tri-Valley Projections,Availability and Timing • Review existing and planned non-potable reuse of wastewater generated in the Tri-Valley; determine potential volumes of wastewater available for potable reuse and associated timing of availability(e.g.,winter months). Consultant will rely on existing data that will be provided by Tri-Valley Agencies(no collection of new data).It is anticipated that the data from the two wastewater treatment plants will be readily available and will be in compiled excel spreadsheets. Task 3.2 Outside of Tri-Valley Projections, Availability and Timing • Discuss options for potential additional wastewater sources outside of the Tri-Valley. Consultant will rely on existing data regarding outside sources that will be provided by Tri- Valley Agencies.It is anticipated that the data from any identified outside sources will be readily available and will be in compiled excel spreadsheets. Task 3.3 Treatment Process and Source Water Evaluation and Yields • Assess treatment requirements for current wastewater effluent quality(e.g.,ammonia reduction through nitrification-denitrification or other methods;tritium in City of Livermore effluent)to achieve regulatory compliance and agreed-upon public health goals. • Determine theoretical recovery efficiency for treatment processes. • Identify potential process/infrastructure modifications at existing wastewater treatment plants that could facilitate potable reuse applications. • Evaluate potential process changes at existing wastewater treatment plants to increase tertiary treatment capacity(e.g.,replace use of tertiary effluent for process water at Livermore WTP with secondary effluent to free up additional tertiary filter capacity). As part of the Treatment Process and Source Water Evaluation and Yields subtask,Consultant will include a high-level review of flow equalization, additional treatment needs(nitrification and denitrification),source control considerations,advanced treatment needs,and treatment(stabilization)to mitigate distribution system water quality impacts. Water quality of finished water and waste stream(RO concentrate or brine)will be estimated and compared to regulatory requirements. Task 3.4 Water Balance • Based on the above information,calculate wastewater quantities available from Tri-Valley for potable reuse application and associated timing. • Calculate potential yields for various potable reuse options based on treatment process recovery efficiency, injection well capacity, losses through groundwater injection and recovery process,