SITE INFORMATION AND CORRESPONDENCE

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Mr. Maurice Benson - 2 - 8 April 2008 Defense Logistics Agency WORK PLAN COMMENTS 1. The Draft Work Plan summarized sampling of soil beneath the Building 10 concrete slab conducted by ACOE in December 2007. On 2 April 2008, Regional Water Board staff contacted URS staff to discuss the source of the ACOE investigation data. On 2 April, URS staff forwarded, via email, a draft of the ACOE report entitled Building 10 Industrial Waste Pipeline Inspection and Sampling Report of Findings, dated February 2008. However, the Draft Work Plan did not provide sufficient detail from that work, including sample locations and concentrations of contaminants of concern (CDCs). The Final Work Plan should include sufficient detail and should reference the ACOE results report. 2. The draft ACOE results report includes data on a 15 October 2007 video survey performed on waste pipes inside of Building 10. The notes and map generated during the field work (Appendix A) reference a concrete slab that filled a portion of a 4-inch diameter cast iron IW PL beneath the west part of the building, a 3-inch diameter cast iron waste pipe, a clean-out located about 40 feet south of the sump near the tool room, and filled pipe trenches west of the clean-out. DESJC should evaluate these recent observations made by ACOE and determine if the proposed sample locations in the Draft Work Plan should be adjusted. 3. The figures in the draft ACOE results report show features not shown on the figures in the Draft Work Plan. For example, ACOE Figures 1 and 2, and the video survey sketch map figure in Appendix A show sumps that are not shown on Figures 1 and 2 of the Draft Work Pian. These features and the features discussed in Item 2, above, should be considered for inclusion on the Draft Work Plan figures. 4. The Draft Work Plan proposes soil and groundwater sample analyses for total petroleum hydrocarbons (TPH) using USEPA Method 8015. Please identify the hydrocarbon range or ranges that the chemical analysis laboratory will quantify. 5. In Table 3-1 on page 3-2 of the Draft Work Plan, it states that 14 CPT borings will be advanced during Round 1 of the work and 31 CPT borings during Round 2. However, other tables and text in the Draft Work Plan indicate that 15 will be advanced in Round 1 and 30 in Round 2. 6. A typographical error in Section 1.1 .1 references Section 1 .2.2 rather than Section 1 .1.2. 7. A typographical error in Section 1.1.6 references Section 1 .2.4 rather than Section 1 .1.4.