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WINNIF <br /> 11 ON I JiM <br /> l w <br /> Chevron U.S.A. - Page 15 <br /> interpreted ground water gradient was mechanically plotted. The ground water is <br /> interpreted as being near flat, with the gradient in August of 1989 calculated at <br /> approximately 8.3xlo-+ (0,04083 ft./€t.) flowing in a east-northeasterly <br /> direction. <br /> Soil samples were obtained from each of the soil borings for chemical <br /> analysis. The samples were analyzed to detect the presence and concentration of <br /> r; <br /> ra. petroleum hydrocarbons as referenced tc; both gasoline and diesel fuels. <br /> Additionally, selected samples were analyzed to detect the presence and <br /> concentration of ethylene dibromide and organic lead, compounds which are <br /> typically associated with regular grade gasoline. The results of the analyses <br /> conducted on subsoil samples has reported the presence of benzene, toluene, <br /> xylenes, and total petroleum hydrocarbons. Those samples analyzed for EDB and <br /> organic lead were reported as non--detected. Results of analysis conducted on <br /> subsoil samples obtained from soil borings B-1 and B-2 reported attenuating <br /> contamination present at depths ranging from approximately 15 to 20 feet below <br /> the existing grade in each boring. The B-1 and B-2 soil borings were situated in <br /> the vicinity of the previous dispenser island locations at the subject property. <br /> Samples obtained from soil boring B-3, which was advanced through the previous <br /> underground storage tank location were generally reported as non-detected, with <br /> exception of sporadic distribution of benzene and toluene at concentration <br /> reported below 1 part per million. <br /> DAMES S MOORE <br />