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r <br /> C-SHADSOFS91.1/1.45 <br /> 12/12/91 <br /> PS#4--Bldg. 404 (Airframe and Component Repair and Storage) <br /> Bldg. 404, which was used for aircraft and component repair from 1953 to 1976, <br /> is currently a storage area. One soil boring (PS4-Bl) was continuously sampled <br /> to a depth of 15 ft downgradient of soil gas Grid #I-85 (which had a TCE soil <br /> y gas level of 1,240 ppb) at the northwest corner of Bldg. 404 (Fig. 1.5-4). One <br /> 1) reading of 150 ppm was recorded by the PID at a depth of 12 to 13 ft; however, <br /> r when removed from the sample, the PID reading continued to climb, which <br /> yindicates the PID may have been malfunctioning and the reading recorded in <br /> error. One composite sample and one VOC sample were collected from each 5-ft <br /> interval in the boring. The soil samples were analyzed for VOCs, inductively <br /> coupled argon plasma (ICAP) metals, and extractable organics. No significant <br /> contamination was observed from the borings at this site. Only one VOC, <br /> chloroform, was measured above detection limits at 0.061 µg/g in the 5- to 10-ft <br /> depth interval. ESE believes that the presence of chloroform in soil samples from <br /> this SWMU and several others is an artifact of laboratory contamination. <br /> Wastes from Bldg. 403 (A#43) may have been pumped into the sump located at <br /> the north end of Bldg. 404 before being sent to the IWTP. A sample of the <br /> water (PS4-SW1) and the sediment (PS4-SEDT) from the sump were collected <br /> and analyzed for metals and VOCs. The sediment was black and had a strong' <br /> i sewage odor and an oily sheen; a large metal plate and other trash were also <br /> 1 encountered in the 8-ft-deep sump. Sediment thickness on the bottom varied <br /> from 0 to 0.5 ft, and the water depth was approximately 1 ft. Analytical results <br /> of the sediment samples indicated high concentrations of metals, notably <br /> chromium, lead, magnesium, and zinc. Also observed were high concentrations <br /> of vinyl chloride, 1,2-dichloroethene (12DCE), TCE, and dichlorobenzene. <br /> Nineteen VOCs were detected in this sediment sample. <br /> L 1-92 y <br />