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Task 4.3 TM 4 Draft TM 4 will summarize Tasks 4.1-4.2. Comments received on the Draft TM will be incorporated into the Draft Report. Task 4.4 Develop Short Listed Alternatives (Conceptual Design/Cost) Using information developed in TM 4(Options)and Tasks 5.1-5.4(Hydrogeologic Feasibility),three short-listed alternatives will be developed in more detail. • Based on findings from Tasks 4.1-4.3,and Tasks 5.1-5.4 recommend a short list of options to analyze further. • Develop high-level conceptual layout of various options, including possible modification of existing wastewater treatment plants for conversion to potable reuse applications. • Develop conceptual design(siting,treatment processes, sizing,brine disposal, transmission/distribution,etc.)for the short list of options. • Assess power requirements, source options(e.g.,PG&E,renewable energy,etc.),and related infrastructure(e.g.,electrical equipment to provide additional load,etc.)for short listed alternatives. • Estimate and compare capital and operation and maintenance costs of short-listed alternatives. • Identify most promising option/s. Task 4.5 TM 6 Draft TM 6 will summarize the results of Task 4.4.Comments received on the Draft TM will be incorporated into the Draft Report. Task 5-Hydrogeologic Feasibility: Consultant will use a two-phase approach to develop options and alternatives that will be developed in parallel with Tasks 3 and 4.The first phase,Regional Modeling, consists of using the existing Zone 7 groundwater basin model to evaluate high-level feasibility of injection and/or percolation.Zone 7 staff will be responsible for running the model.The second phase, Localized Analysis,consists of a more detailed feasibility analysis of specific sites in short listed alternatives.This second phase includes evaluation of groundwater quality,potential for contaminant mobilization,and plugging potential.Task 5 is a desktop evaluation that relies on data provided by the agencies,and does not include any physical testing or drilling. Regional Modeling Efforts: The Regional Modeling effort tasks will use existing information that is available to evaluate the wide range of alternatives and screen them down to feasible options. Task 5.1 Background Information and Model Review • Review relevant data(to be provided by Tri-Valley Agencies)related to historical groundwater quality, groundwater modeling recharge/injection rates,geological studies, etc. Task 5.2 Chain of Lakes (COL)Evaluation • Assess COLs recharge feasibility based on existing literature and modeling results,recommend candidate lake/s,and recommend next steps for field investigation. Task 5.3 Groundwater Model Work Plan • Provide technical direction to Zone 7 staff on the development of a groundwater modeling work