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REGIONAL GROUNDWATER FACILITIES PROJECT <br />FEASIBILITY STUDY <br />9 Zone 7 Water Agency <br />December, 2025 <br />are summarized below in Table 2. A more detailed spreadsheet with monthly assigned pumping rates for <br />each scenario and well is provided in Appendix E. <br />Table 2. Summary of Scenario Pumping Volumes at New Production Wells <br />Scenario New Production <br />Wells Year Type Target Pumping <br />Volume (AFY) <br />Actual Pumping <br />Volume <br />Annual <br />Shortfall (AFY) <br />1 Del Prado; <br />Tennis; Hansen Drought 9,000 8,783 217 <br />1 Del Prado; <br />Tennis; Hansen Average/Wet 6,500 6,500 0 <br />2 Tennis; Hansen Drought 9,000 8,018 982 <br />2 Tennis; Hansen Average/Wet 6,500 6,500 0 <br />3 Tennis; Del Prado Drought 9,000 6,591 2,409 <br />3 Tennis; Del Prado Average/Wet 6,500 6,344 156 <br />The anticipated screen zones in each new production well were compared to model layering to assign well <br />screen to appropriate model aquifer layers in the groundwater model. In addition, flow profiling data <br />collected during aquifer testing at each test well site were reviewed. The combination of well screen <br />assigned to each model layer and proportion of flow derived from each screen zone during field testing <br />were used to assign the amount of flow coming from each model aquifer layer for each well. This <br />information is summarized in Appendix F and was provided to the groundwater modelers to assist with <br />assignment of the vertical distribution of pumping. <br />The model scenario results are briefly summarized below in Table 3. The groundwater model results were <br />evaluated for overall conclusions regarding three main areas: <br />Potential migration of PFOS footprint; <br />Potential impacts to basin sustainability in terms of Alt GSP Sustainability Management Criteria <br />(SMC); <br />Potential well interference impacts to third party wells. <br />As indicated in Table 3, groundwater model results indicate that none of the scenarios were found to be <br />problematic in terms of the three different areas outlined above. Overall, these model results indicate <br />that all scenarios are acceptable in terms of hydrogeologic considerations and warrant further <br />consideration in terms of cost and other engineering factors. A detailed summary of groundwater model <br />scenario results are provided in Appendix G.