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Chevron U.S.A. - Page 17 <br /> C-D, which was situated in .the general vicinity of Dames & Moore's current soil <br /> boring/monitoring well location B-1. Similar to what was reported during Dames & <br /> Moore's current investigation, the concentrations of benzene noted in those <br /> I <br /> Woodward-Clyde samples obtained from about 20 and 30 feet below grade were <br /> reported at 0.12 and 0.16 parts per million, respectively. All other � <br /> constituents were reported as non-detected for the samples analyzed at the time i <br /> of that investigation. <br /> Actual discernible residual contamination at the subject property is <br /> .interpreted by the attenuating trend observed at the B-1 -and B-2 soil boring � <br /> locations. This trend has been interpreted to suggest that residual vertical <br /> liquid migration has attenuated observably at an approximate maximum depth of 20 <br /> feet below <br /> grade, an is interpreted as most probably limited to the previous <br /> dispenser island locations. <br /> C I <br /> I <br /> Ground water samples obtained from the ground water monitoring wells <br /> installed at the subject property were submitted to a State-approved laboratory <br /> for chemical analysis. Ground water samples were analyzed to detect the presence <br /> and concentration of petroleum constituents as referenced to gasoline. The <br /> results of those analyses reported non-detectable levels of petroleum <br /> hydrocarbons present in ground water. <br /> DAMES & MOORE <br />