SITE INFORMATION AND CORRESPONDENCE

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Comment 4: Page 3-11, Removal Action Objective, Site 5C In addition to sampling the pit, sump, and sediment trap contents, the EE/CA proposes to sample the soil beneath the pits and sumps for VOCs, SVOCs, pesticides/PCBs, and metals. The soils beneath the sediment traps will be sampled for PCBs and metals. If the sample results show concentrations below levels of concern, the Navy will propose no further action after sump closure at Site 5C. The EE/CA should clarify how the sediment traps worked. It is not clear whether or not the sumps discharged to the sediment traps or what was discharged into them. ?heir construction details also should be included in Appendix C. The 4-inch drain line and the storm drain are components of Site 5C. However, the soils in their vicinity have not been sampled. Two soil samples along the 4-inch drain line and one soil sample near the storm drain should be taken for pesticides/PCBs and metals analyses. If all of the soil sampling results show concentrations below levels of concern, the Board will not require additional soil sampling. However, Site C cannot be closed until contaminated ground water has been cleaned up. Response: Text has been added in Section 2.1.1 (Site 5C) to clarify the way the pits and associated sumps and sediment traps functioned. A detailed drawing (Figure C-4) of the sediment traps with dimensions has also been added to Appendix C. i It is the Navy's intent to collect samples along the 4-inch drainline and at the storm drain during the future RI and feasibility study (FS). A response action (if necessary) will be identified using data from the RI/FS and integrated with a response (if necessary) action for Site 5D, the drainage ditch to which the storm drain discharges. It is the Navy's intent to document no further action for the pits, sumps, and sediment traps if no contaminants above levels of concern are detected in soils beneath them. No further action for cleanup of groundwater will not be pursued at this time. Future actions (if necessary) will be taken to address remaining soil or groundwater contamination beneath pits, sumps, and sediment traps. The text has been made more specific. Comment 5: Page 3-10, Removal Action Objective, Site 5J The EE/CA proposes to sample the soil and ground water (if encountered) beneath the center of the sump for VOCs, SVOCs, TPH, pesticides/PCBs, and metals. (f the sample results show concentrations below levels of concern, the Navy will propose no further action after sump closure at Site 5J. Figure 2-3 shows that in addition to the sump, an L-shaped channel, a pit, and a shallow recess are components of Site 5J. These components have not EFCARFSP.STA:W-L3321REREI:11/15/95 I1:36am 5