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CBROWN AND CALDWELL 40th Anniversary 1947-1987 <br /> CONSULTING ENGINEERS Service • Excellence • Efficiency <br /> July 20 , 1987 jp aZ1 <br /> Mr. Doug Wilson, R.S. ; 11.. 2111987 <br /> Local Health District <br /> San Joaquin County ENVIROMENTAL HEALTH <br /> 1601 East Hazelton Avenue FERMIT/SERVICES <br /> Stockton, California 95205 017-3308-01/4 <br /> Subject: Laboratory Results, ARCO Station 6100 , <br /> 25775 South Patterson Pass Road, <br /> Tracy, California <br /> Dear Mr. Wilson: <br /> Enclosed are the laboratory results of the June 23 , 1987, soil <br /> sampling at the subject site. Soil sampling locations are shown on <br /> Figure 1 . The results of the three stockpile samples , TSP-1 , <br /> TSP-2 , and TSP-3 indicated no detectable purgeable halocarbons <br /> (U.S . Environmental Protection Agency (EPA) Method 8010) , total <br /> petroleum fuel hydrocarbons (EPA 8015 , modified) , benzene, toluene, <br /> and xylene (BTX) (EPA 8020) , or polychlorinated biphenyls (PCBs) <br /> (EPA 8080) constituents. <br /> The results of the one soil sample, TEA-1 , taken from the edge of <br /> the asphalt, indicated significant waste oil product. Results <br /> indicated 4 ,875 parts per million ( ppm) EPA 8015 , 8 parts per <br /> billion trichloroethylene (TCE) (constituent detected under EPA <br /> 8010 ) , and 0 . 3 ppm EPA 8080 . EPA 8020 constituents were <br /> nondetectable in this sample. <br /> It is possible that the waste oil leaked from the underground <br /> storage tank when it was removed. The released waste oil then <br /> traveled across the paved lot to the edge of the asphalt ( see <br /> Figure 1 ) . The waste oil in the soil at the edge of the asphalt is <br /> probably a result of the local spill . However, the possibility <br /> exists that the detectable product could be from the components <br /> used in making asphalt. <br /> Additional soil sampling from along the edge of the asphalt is <br /> recommended to determine the source and extent of waste oil <br /> product. These samples should be collected from the potentially <br /> clean soil outside the plume of the waste oil spill . Samples <br /> 723 S STREET SACRAMENTO,CA 95814 . (916)444.9123 <br />