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AGS <br /> ATTACHMENT 2 <br /> RESPONSE TO SAN JOAQUIN COUNTY,PHS/EHD COMMENTS <br /> discharge lines at all three OWS sites, where they connect to a sanitary sewer line. The <br /> proximal ends of the OWS discharge lines are already covered by proposed boring <br /> locations adjacent to the OWSs. A total number of 3 borings will be added to provide <br /> coverage of these components of the OWS systems at Buildings 12, 410A and 508. The <br /> specific number and location of the added borings at each site are described below: <br /> • At the Building 12 OWS site, one boring will be added at the distal end of the OWS <br /> discharge line where it connects to the sanitary sewer line. Since the discharge line <br /> is only 28 feet long, the single boring at the distal end of the discharge line is <br /> considered to provide adequate spatial coverage. <br /> • At the Building 410A OWS site, one boring will be added 14 feet from the OWS, <br /> where the OWS discharge line makes a right-angle turn to the south. The discharge <br /> line continues southward for another 50 feet to a junction with the sanitary sewer. <br /> Soil borings are not proposed for this segment of the OWS discharge line because it <br /> extends across a portion of an Installation Restoration Program (IRP) study area, <br /> designated as Site IR-6. The occurrence of contamination in this area is being <br /> addressed by the IR-6 study. <br /> • At the Building 508 OWS site, the distal end of the OWS discharge line and junction <br /> with the sanitary sewer is located approximately 10 feet from the OWS. One boring <br /> will be added at this location. <br /> Soil and grab groundwater samples will be collected from the new borings located at the <br /> distal ends of the OWS discharge lines. Each soil and grab groundwater sample will be <br /> analyzed for the chemical parameters listed in the Work Plan. The above <br /> recommendations for sample depths will be followed. <br /> Comment 3: In the event floor drains are connected to the OWS network <br /> PHS/EHD recommends subsurface sampling at these locations. <br /> Response: The Building 12 OWS site is the only location having an additional floor <br /> drain attached to the OWS system. A soil boring is not proposed for the Building 12 <br /> catch basin. Anecdotal evidence suggests that only soapy water from boat washing <br /> was flushed down this drain. <br /> C\Wpwin60\WPDOCS\95-CLTS\1995\950304p\sjcehdresp.doc 2 <br />