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Rli'510! 111ill:: 111111 Qil:iii <br /> Limited Environmental Investigation May 15, 1990 <br /> ARCO Service Station 6100, Tracy, California AGS 30041-IW <br /> collected at 30 feet below grade, we will drill until (1) two consecutive samples collected <br /> at 5-foot intervals show PID readings of Iess than 50 ppm or(2) until we encounter ground ; <br /> water o:auger refusal. Other additional subjective evidence of gasoline hydrocarbons such <br /> as soil discoloration or obvious odor will be noted. <br /> S <br /> If the first boring is terminated above 30 feet below grade,three additional 8-inch-diameter <br /> i <br /> soil borings will be drilled approximately 2-1/2 feef from the edge of the tank area equally . <br /> f <br /> -� spaced around the tank perimeter. If the first boring is drilled deeper than 30 feet, then <br /> y <br /> two additional borings will be using the above criteria. A boring will not be drilled <br /> .. on the opposite end from the fill ports. <br /> i <br /> { An additional two soil borings will be drilled to approximately 20 feet in the area where the s <br /> new tank cavity may be excavated. This proposed tank cavity area is,shown i,n Plate P-2: <br /> '® a <br /> J <br /> Collecting oil Samples <br /> During drilling,soil samples will be collected at 5-foot or other appropriate intervals using <br /> . •- a California-modified, split-spoon sampler equipped with clean brass sleeves. Samples will z <br /> 'r <br /> be collected by drilling the boring to a point just above the sampling depth and then driving . <br /> the sampler into the soil through the hollow center of the auger. The sampler will be <br /> 8 <br /> Applied GeaSyetelfls <br />