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Report on Soil and Ground-Water Evaluation September 11, 1989 <br /> Proposed ARCO Station, Woodbridge, California _ . . _- . AGS 39044-1 <br /> toluene, and total xylene isomers, which-are associated with the higher volatile phase of <br /> gasoline. Before analyzing the vapor samples, the chromatograph was calibrated with a = <br /> standard gas containing-equal-concentrations (1 ppm) of benzene, toluene, and each_of the <br /> xylene isomers (para-, meta-, and ortho-xylene). <br /> Results of Soil-Vapor Survey <br /> vv Results of the soil vapor survey in ppm of hydrocarbon vapor contained in the soil vapor <br /> are in Table 1. Results of the soil-vapor analyses indicated that -toluene was detected in <br /> five locations, VP-1 through VP-5, near the east side of the site, in-very low concentrations <br /> (0.5 to 1.0 ppm) as shown on Plate P-4. The levels of benzene and xylene isomers were <br /> nondetectable in each of the 16 vapor probe locations. <br /> Drilling and Sampling-of Soil - <br /> A geologist from Applied GeoSystems was at the site from June 13 to 14, 1989, to observe <br /> drilling and well construction, collect soil- samples, and evaluate drill cuttings subjectively <br /> for evidence of contamination. The borings were drilled by Wayne Drilling Company of <br /> Lincoln, California, with a CME-55 drill rig equipped-with.-8-inch-diameter, continuous- <br /> flight, hollow stem augers. The augers were steam-cleaned prior to use in each boring to <br /> minimize the possibility of downhole or crosshole <br /> 10 <br /> Coo <br /> Applied GeoSystems <br />