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b. It will result in samples being collected from Fill 3 which <br /> currently has no planned leachability sampling. <br /> C. It will result in samples being collected where the maximum <br /> concentrations of napthalene, diethylphthalate and TPH-diesel were <br /> reported, as shown on Figure 4-6. <br /> 4. Soil Sampling Depths and Depth to Groundwater <br /> Typical depths for soil sampling in the work plan are 5 feet, 10 feet, <br /> and 15 feet, if above the groundwater table (e.g. , SWMU 7, SWMU 33) . <br /> However, at the time of sampling, the depth to groundwater could be less <br /> than 15 feet. Thus, just prior to sampling, we highly recommended that <br /> DDJC-Tracy check the upper aquifer monitoring wells near each area to be <br /> sampled to determine the depth to groundwater, and to adjust the depth <br /> of sampling intervals, as needed, to be above the water table. This may <br /> lead to slight variations in sampling intervals, e.g. , 4, 9 and 14 feet, <br /> or 4, 8, and 12 feet. <br /> 5. Sample Location Flowcharts, Figures 5-1 through 5-3 <br /> These figures describe the logic for collecting additional step out <br /> samples at SWMU 1/Area 2, Area 3, Area 1/Building 237, SWMU 20/SM204, <br /> and SWMU 24. To decide whether additional step out sampling is needed, <br /> these flow charts include decision boxes labeled "Project Team <br /> Concurrence. " Please define the members of the "project team" for the <br /> purposes of step out sampling decisions. Do they include regulatory <br /> agency personnel? Please describe the reasons for including or <br /> excluding regulatory agency personal as part of this "team. ° How much <br /> review time will be provided team members to concur on step out sample <br /> decisions? <br /> Detailed Comments <br /> 6. Section 1.1.1.2, SWMU 33 remedial action, page 1-1 <br /> The third bullet lists SWMU 33 among sites which "require institutional <br /> controls and groundwater monitoring only. " However, the selected remedy <br /> in the ROD for this site includes pipe grouting and limited excavation. <br /> Please revise the text accordingly. <br /> 7 . Section 1.2.10, page 1-8; and Table 1-2, RD/RA Documents <br /> Additional documents, as noted in Section 1.2.10, may be necessary to <br /> complete the RD/RA process, and should be included explicitly in Table <br /> 1-2 with footnotes indicating that discussions are continuing with the <br /> agencies to finalize which documents are applicable. These documents <br /> include: <br /> * Preliminary Close-Out Report (PCOR) <br /> * Five-Year Review Report <br /> * Final Close-Out Report (FCOR) <br /> 3 <br />