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Groundwater Well Installation Work Plan Sharpe Army Depot <br /> Lathrop, California <br />Ahtna Environmental, Inc. Page 2 of 6 <br />Reviewer Nadia Hollan Burke Organization Environmental Protection Agency Date July 14, 2020 <br />Item Reference Review Comment Response <br />3. Section 1.3, <br />Previous <br />Investigations, <br />Page 3, and Figure <br />6, Time-Series Plot <br />Section 1.3 states that concentrations of <br />trichloroethene (TCE) have been increasing since 2012 <br />and references Figure 6, but Figure 6 is not labeled to <br />indicate that the data references concentrations at <br />MW505C. Additionally, Section 1.3 states that the TCE <br />concentrations have been rising since 2012, but Figure <br />6 shows increasing TCE concentrations since 2005. <br />Please revise Section 1.3 to more accurately describe <br />the information presented on Figure 6. Additionally, <br />please revise the Figure 6 title to indicate that the data <br />is from well MW505C. <br />Revised. The figure tile has been updated. The text was <br />revised to indicate TCE concentrations have been <br />slightly increasing since 2005. <br />4. Section 3.1.5, <br />Support Facilities, <br />Page 6 <br />Section 3.1.5 states, "Decontamination facilities will <br />consist of portable secondary containment for <br />personnel and an equipment decontamination pad," <br />but it is unclear what is included in the "portable <br />secondary containment for personnel" and where the <br />decontamination pad will be placed. A figure should <br />be revised to include the location of the <br />decontamination pad. Please revise Section 3.1.5 to <br />provide additional information regarding portable <br />secondary containment for personnel. Additionally, <br />please revise the text to discuss the location of the <br />decontamination pad and include this location on a <br />figure. <br />Revised. Portable secondary containment for personnel <br />is not expected to be needed and has been removed <br />from the section. The location of the equipemnt <br />decontamination pad has been included in Section 3.1.5 <br />and Figure 2. <br />5. Section 3.2.1, Well <br />Construction, <br />Page 7: <br />Section 3.2.1 indicates that well construction diagrams <br />are presented on Figures 12 to 14 but they are found <br />on Figures 13 to 15. Please revise the text to reference <br />the correct construction diagram figures. <br />Revised. The referenced text was changed to Figure 13 <br />to 15.