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Response to Comments Table <br /> California Army National Guard <br /> Stockton, California <br /> (Page 4 of 7) <br /> Comment Comment from <br /> Number Central Valley Regional Water Quality Control Board Letter Response <br /> dated March 15, 1999 <br /> 4 Figure 4 indicates an open ditch extending along the fence line Page 7, 5t1i bullet. <br /> which surrounds the buried drum area. The ditch also carries Collection of soil and soil gas samples from 11 <br /> drainage along the northern perimeter of the facility (south side of locations (B 15a through B 18b) at 100 foot <br /> Stimson Street) until it discharges to the Stockton storm drain intervals along the ditch area will be <br /> system. Our inspection of the facility and Figure 4 suggest that performed. Surface soil samples will be <br /> potential run-off into the ditch could occur from surrounding vehicle composited in groups of up to three and <br /> and equipment storage areas. Our inspection of the ditch and submitted for laboratory analysis. Subsurface <br /> surrounding areas did not reveal any evidence of leaks from soil samples will also be composited in groups <br /> equipment or vehicles. However, it appears the ditch could of three prior to analysis. Soil gas samples will <br /> potentially have been impacted by drainage from other areas such as be analyzed for VOCs. Surface samples will <br /> the CSMS, which stored hazardous materials and waste. Also, the be collected midway between the base of the <br /> ditch is approximately 100 feet northeast of the hazardous waste ditch and the crest. Each of the composite soil <br /> storage area (north of the CSMS) which may have been the site of samples will be initially analyzed for TPH and <br /> "Old" hazardous waste spills (see discussion above comment #3). metals. If high concentrations (greater than <br /> The ditch area should, therefore, be investigated for VOCs, SVOCs, 1,000 mg/kg) of TPH are identified, the sample <br /> heavy metals, BTEX and TPH. The revised Work Plan should will also be analyzed for SVOCs. <br /> include discrete soil sampling at regular intervals (e.g., every 100 <br /> feet). The sampling protocol should include collection of surface <br /> and subsurface soil samples to an initial depth of 5 feet below <br /> ground surface. Surface samples should be collected from the walls <br /> and crest of the ditch. <br /> 1527-99/3134-100/AUG 13'99 <br />