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Groundwater Well Installation Work Plan Sharpe Army Depot <br /> Lathrop, California <br /> Reviewer Carla Landrum Organization Central Valley Water Board Date April 6, 2023 <br /> Item Reference Review Comment Response <br /> review period.This commentary, consequently, might <br /> impact Appendix A of the Work Plan. <br /> 6. Figure 7 of the Work Plan estimates the lateral capture <br /> zones for existing and operating extraction wells.The <br /> Work Plan should also superimpose (on Figure 7)the <br /> estimated capture zone for each proposed extraction well. <br /> Please also update Figure 7 to show potentiometric <br /> surface contours in the southern extent, and southwest <br /> corner, of Sharpe. <br /> 4. The Army is moving forward with an on-and off-base Revision. Language has been added to Section 5.0 to note <br /> remedial investigation at Sharpe for Per-and that a PFAS investigation is taking place and that worker <br /> Polyfluoroalkyl Substances (PFAS). For human health and protections related to PFAS are the same as VOCs. <br /> safety, it is incumbent upon the Army to include PFAS in Clarification. Permits can be processed without PFAS <br /> the Work Plan for worker situational awareness and to disclosure. PFAS information will be disclosed in the PFAS <br /> ensure safety procedures are in place to protect all Report. <br /> workers during Work Plan implementation. For general <br /> public safety,the Army will need to disclose Sharpe's PFAS <br /> contamination in relation to Sharpe when seeking a <br /> permit from San Joaquin County Environmental Health <br /> Department. <br /> 5. Section 1.2 Discusses four hydrostratigraphic zones beneath Clarification.The hydrostratigraphic zones are labeled on <br /> Sharpe. These zones are subject to interpretation. Figures 3-5 on the far right side of the figure (blue text), <br /> Please update Figures 3 -5 to depict the Army's next to the elevation numbers. <br /> interpretation of these zones. Also, please update As the proposed well locations do not intersect the cross- <br /> Figures 3 - 5 to depict the estimated capture zone for section lines directly(Figure 2), it can be difficult to <br /> existing and proposed extraction wells. interpret a well's screen location in relation to the plume. <br /> Figures 3-5 should be used in conjunction with Figures 6 <br /> and 8, as well as Table 2 to gain a better understanding of <br /> well locations in relation to the plume. Capture zones for <br /> Ahtna Environmental Inc. Page 5 of 6 <br />