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:a <br /> May 10, 1987 AGS 86103-2 <br /> Cardlock Station #27 - Stockton, California <br /> Water samples were collected on March 19, 1987 from the first <br /> three monitoring wells. These results were shown to be invalid <br /> #Y <br /> on the basis of laboratory tests of the sampling equipment. <br /> Ground water samples were collected from all four monitoring <br /> wells after installation of MW-4 , using special precautions to <br /> avoid sampling errors. The levels detected in the samples show <br /> very low levels of contamination. Only MW-4, located down <br /> - gradient from the tank cavity, contained hydrocarbon constituents <br /> 't (benzene) at levels above drinking water standards established by <br /> the California Department of Health Services. <br /> 3 <br /> Analyses of soil samples indicate that significant contamination <br /> is limited to the tank backfill material and the native soil <br /> T immediately below the tank cavity. <br /> rr <br /> EVALUATION OF GROUND WATER GRADIENT <br /> An evaluation of the ground water gradient across the site was <br /> made through the use of an automatic levelling instrument. The <br /> instrument was used to measure the differences in elevation <br /> ' between the instrument and the top of the casing for each of the <br /> i <br /> s W <br /> a <br /> L <br /> 10 _ BQ011001 _ <br /> S <br /> .4,o��jed G�osystems <br />