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F, <br /> With the approval of the San Joaquin Local Health <br /> District , RAMCON backfilled the excavation with clean pea <br /> gravel and covered it with concrete. <br /> FI 3 .0 CURRENT INVESTIGATION <br /> FilWith the permission of the SJLHD and because TPHg and <br /> BTEX detection limits reported in analyses of samples from <br /> the tank cavity were considered unacceptable by the county, <br /> FjRoger Foott Associates , Inc. observed the drilling of three <br /> soil borings' in locations corresponding to the previous <br /> r <br /> samples and observed excavation of contaminated soil from <br /> the area near the former dispens r. <br /> h3 . 1 Soil Borings <br /> I ' <br /> 1 ' Soil borings B1, B2 , and ,B3 were drilled on January 15, <br /> 1991, in locations corresponding approximately to earlier <br /> samples within the former tank c vity at depths of <br /> approximately 10 to 15 ft using Mobile B-53 drilling rig <br /> �i equipped with 8-in diameter , continuous-flight , hollow-stem <br /> 1k augers . The drilling equipment was operated by Woodward <br /> Drilling Company of Rio Vista, California, a licensed well <br /> driller . Boring B1 reached a maximum depth of 11 . 5 ft . <br /> Borings B2 and B3 reached a maximum depth of 16. 5 ft. The <br /> auger flights were steam-cleaned prior to use in each boring <br /> to minimize the possibility of downhole or cross-boring <br /> contamination. The drilling was observed by a field <br /> geologist and the earth materials in the borings were logged <br /> F1as drilled. <br /> Soil samples were collected at the base of each boring <br /> F' using a California-modified, split-spoon sampler equipped <br /> with clean brass sleeves . Samples were collected by <br /> F <br /> drilling to a point immediately above the sampling depth, <br /> and then driving the sampler into the soil through the <br /> hollow center of the augers . <br /> F <br /> ROGER FOOTT ASSOCIATES, INC. <br /> Fa <br /> -5- <br />