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RECEIVED <br /> DEC 12 1995 <br /> NOVEMBER 16, 1995, RESPONSES TO �NViRONMENTAL KALTH <br /> DEPARTMENT OF TOXIC SUBSTANCES CONTROL AND PERMIT/SERVICES <br /> CENTRAL VALLEY REGIONAL WATER QUALITY CONTROL BOARD COMMENTS <br /> DATED OCTOBER 16, 1995, ON THE <br /> DRAFT ENGINEERING EVALUATION AND COST ANALYSIS FOR <br /> SITES 5A, 5C, AND 5J DATED AUGUST 23, 1995 <br /> NAVAL COMMUNICATION STATION STOCKTON <br /> STOCKTON, CALIFORNIA <br /> General Comments <br /> Comment 1 In an effort to avoid duplicating the document with a subsequent workplan, <br /> details regarding full closure of the sumps, such as receipt and review of <br /> analytical results prior to filling the sumps with sand should be expanded <br /> within the Engineering Evaluation/Cost Analysis (EE/CA). In sections of the <br /> report, where appropriate, please state that the sumps will not be filled with <br /> sand and/or concrete prior to receiving analytical results to determine if soil <br /> contamination beneath the sumps exists. Upon receipt of the analytical <br /> results, the appropriate State agencies will be contacted, if necessary, prior to <br /> filling the sumps with sand and/or concrete. Soil samples beneath the sumps <br /> should be collected from a location where cracks in the concrete are visible or <br /> at the seams where there ate lines in the sumps since those areas are most <br /> likely to indicate if contamination is present. Additional comments provided <br /> by the RWQCB are included in Enclosure 1. The EE/CA must be modified to <br /> adequately address these issues. <br /> Response: As stated in the EE/CA (Section 3.5), it is the Navy's objective to close the <br /> pits (Site 5C), sumps (Site 5A, 5C, and 5J), and sediment traps (Site 5C) <br /> upon removal and management of their contents and the steam cleaning of <br /> each. After soil samples are collected from beneath the pits, sumps, and <br /> sediment traps and after groundwater grab samples are collected, if <br /> groundwater is encountered at Sites 5A and 5J, it is the Navy's desire that the <br /> pits, sumps, and sediment traps be filled immediately to prevent future <br /> accumulation of liquids. Such accumulation might reestablish the present <br /> conditions for taking a removal action. If soil samples indicate no chemicals <br /> of concern are present, the pits, sumps, and sediment traps would be filled <br /> with soil and sealed with concrete. If chemicals of concern are present in the <br /> samples, the pits, sumps, and sediment traps would still be filled. Because of <br /> the high groundwater table and location of the pits and sumps within <br /> buildings, future response actions are anticipated to be groundwater remedial <br /> actions. The last two sentences in Section 5.2.4 now state that "It is <br /> anticipated that any additional response actions that may be needed will be <br /> groundwater remedial actions. Filling the sumps, pits, and sediment traps will <br /> not interfere with this type of action." <br /> EECARESP.STA:011-33:IRERE 1:11/15/95 11:36: 1, <br />