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I <br /> r <br /> Evaluation Of Contamination January 3, 1989 <br /> Former 'Texaco Service Station, Manteca, California AGS 38053-1 <br /> Drilling and Soil Description <br /> A geologist from Applied GeoSystems was <br /> present at the site on <br /> October 24, and 25, 1988, to observe drilling and well <br /> construction, collect and log soil samples, and subjectively <br /> evaluate drill cuttings for evidence of contamination. The <br /> borings were drilled and monitoring wells were constructed to <br /> evaluate contaminant levels at the suspected source of <br /> contamination in the inferred down-gradient direction of ground- <br /> water flow and in the inferred horizontal direction of ground- <br /> water flow. The borings were drilled by Spectrum Exploration, <br /> Inc. of Stockton, California, using a CME-55 drill rig equipped <br /> with 8-inch-diameter, continuous-flight, hollow--stem augers. The <br /> augers were steam-cleaned prior to use in each boring to minimize <br /> the possibility of downhole or crosshole contamination. Soil <br /> borings B-1 through B-3 were drilled to total depths of <br /> approximately 41-1/2 feet. Ground water was encountered <br /> approximately 25 feet below the ground surface in each boring. <br /> During drilling, soil. samples were collected at 5-foot intervals <br /> or at apparent changes in soil type using a California-modified, <br /> splitpspcon sampler equipped with clean brass sleeves. The <br /> -samples-were-collected-b - <br /> y a vancinc, the-boring-to a point �- — ---- --' <br /> 7 <br /> �' APPIed 0Ge0SXS *ms <br />