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Groundwater Well Installation Work Plan Sharpe Army Depot <br /> Lathrop, California <br />Ahtna Environmental, Inc. Page 4 of 6 <br />Reviewer Nadia Hollan Burke Organization Environmental Protection Agency Date July 14, 2020 <br />Item Reference Review Comment Response <br />8. Section 3.2.5, <br />Conveyance <br />Piping Installation <br />and Electrical <br />Hook-up, Page 12, <br />and Section 3.3, <br />Waste <br />Management, <br />Page 14 <br />Section 3.3 discusses soil generated during trenching, <br />but the text does not discuss trenching, and it is <br />assumed that this is necessary to install the <br />conveyance piping and electrical lines discussed in <br />Section 3.2.5. Please revise Section 3.2.5 to discuss <br />trenching activities. <br />Revised. Trenching activities were added to Section <br />3.2.5. <br />9. Section 3.2.7, <br />Sampling, Page 13 <br />Section 3.2.7 states that the newly installed wells will <br />be sampled no sooner than two days after well <br />development, but sampling should occur at least <br />seven to 14 days after well development to ensure the <br />well equilibrates with the aquifer. Please revise <br />Section 3.2.7 to state that newly installed wells will be <br />sampled no sooner than seven to 14 days after well <br />development. <br />Clarification. As bailing and swabbing, followed by <br />pumping, will be used to develop the wells (Section <br />3.2.2), no undue forces will be applied to the formation <br />and sampling a minimum of two days after <br />development will be sufficient to allow the groundwater <br />to re-equilibrate. No revisions have been made to the <br />text. <br />10. Table 1, <br />Specifications for <br />Proposed <br />Groundwater <br />Extraction Well, <br />and Figure 14, <br />Groundwater <br />Monitoring Well <br />Construction <br />Diagram: <br />Table 1 states that a 10-foot length screen will be <br />used, but Figure 14 indicates that a 10 to 15-foot <br />length screen will be used. Please resolve this <br />discrepancy. <br />Revised. Figure 14 was updated to indicate a 10-foot <br />length of screen will be installed. <br /> <br />