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4 <br /> Chevron U.S.A. - Page 15 <br /> f � <br /> Linterpreted 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 /> II � approximately 8.3x14_4 (4.04083 ft./ft.) flowingin <br /> 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 /> petroleum hydrocarbons as referenced to hath 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 /> 1 <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 sail borings B-1 and B-2 reported attenuating � <br /> contamination present at depths ranging from approximately 15 to 20 feet below <br /> a I <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 /> i <br /> Samples obtained from soil boring B-3, which was advanced through the previous <br /> Lunderground 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 /> L� I <br /> 1 DAMES &MOORE <br />