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JOINTLY FUNDED POTABLE REUSE STUDIES AND OTHER EFFORTS* (as of December 9,2019) TASK DESCRIPTION ESTIMATED CONSULTANT COST Desktop GW Contaminant A consultant will evauate the potential for groundwater contaminant $100,000 Mobilization Study mobilization if purified water is introduced to groundwater,and identify potential mitigation strategies.This could involve sampling of native groundwater and prediction of the water quality of purified water,geochemical analysis of soil samples,and evaluation of existing groundwater quality and well operations data.A desktop geochemical model (e.g., using Geochemist's Workbench software) will be used. Groundwater Building on the results of the desktop study,a consultant will $400,000 Investigations(e.g., complete a field and laboratory study to better characterize the leaching study,tracer potential for contaminant mobilization and characterize the study) suitability of various locations for the siting of injection wells.Core samples will be collected from the groundwater basin and laboratory experiments will be conducted.A tracer study to evaluate travel times may also be completed. Injection Well Siting Study A consultant will guide site selection for potential injection wells $100,000 through a detailed analysis of the groundwater basin's hydrogeology, expected travel time to production wells,infrastructure proximity and availability,land area to support construction and operation of the injection wellfield/s,optimization of Zone 7's salt management strategies,impacts to delivered water quality,etc.This will be coordinated with other related efforts being conducted over 2020/2021(e.g.,Contaminant Mobilization Study and Zone 7's Well Implmentation Plan Update). Communications A consultant will develop a strategic plan for consistent regional $200,000 communications on issues related to Tri-Valley water supply reliability,including the evaluation of options such as potable reuse. The consultant would also provide support in developing the appropriate materials,coordinating efforts amongst retailer and Zone 7 communications staff,conducting workshops,and other related efforts as-needed. Independent Advisory A consultant will convene and facilitate a committee comprising $100,000 Panel technical, regulatory,and environmental experts in the area of potable reuse to address questions regarding project feasibility and optimization as well as addressing public concerns regarding safety etc.This body would provide an unbiased perspective,and would provide recommendations on next steps for the project after various efforts are completed in 2020 and 2021.The budget will also cover the participation of panelists(e.g.,travel). Other Efforts(e.g., This item covers other efforts necessary to advance potable reuse, $100,000 institutional analysis, including tracking of grant opportunities and preparation of grant grants,etc.) materials,institutional analysis to identify and evaluate potential arrangements among the agencies,etc. TOTAL $1,000,000 *Scope and costs may be modified based on discussions with consultants and advice from the Independent Advisory Panel.