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Table i. Summary of Analytical Data(mg/kg) <br /> �np1a <br /> Location TEPHC TYPHC Benzene Toluene Xylene T Lead <br /> West <br /> end 15,000 2,000 2 9 <br /> 33 g,? <br /> East <br /> end 6,400 260 ND 4 16 <br /> 8.0 <br /> TEPHC=Total Extractable Petroleum RYdrocarbons <br /> TYPHC=Total Yoletlle Petroleum Hydrmarbons <br /> Proposed Work Pian <br /> Geological Technics proposes to dr111 four sail borings at a distw of 1,5 to 20 feet from the <br /> center of the underWound diesel storage tank. The site ma shows the <br /> boring, in the first boring,soil samplas will be collected at three footp Osedalslt tion of each <br /> wh ich is estimated to be at about 12 to 15 feet. I f ground water is found to be deeper ground <br /> o nd water,fee , <br /> e' soil samples in subsequent borings will becollectedat 5 foot Intervals. Analytical samplingwilt <br /> not=vr below ground water,however <br /> purposes. , geofogicai samples w111 be collected for evaluation <br /> If sfgnlficant soil contaminatfon is encountered in these borings,additional borings will need to be <br /> drllledtadeflnethe zerc-conteminatfonline, Theplacementoftheseboringswilibedeterrnined <br /> using the analytical date from the Initial borings. Prior todrilling asecond set of borings, <br /> analytical data will be reviewed with and author izatIon for boringsoblained from WIIIlam <br /> Stewart, <br /> If during,the course of field Invest lgat Ion,groundwater con lam inatIon is det , lag <br /> i <br /> ecteda monitorlag <br /> well will need to be Installeddown-gradientfrom the fuel tanks. As found by The San Joaquin c� <br /> -10 <br /> C bkyFloodControl&;Yater Omseryation District Fall 1986 Semi Annual Ground Water Report, 5P� <br /> itt8 ground water grad <br /> lent In the Tracy area flows toward the north. This monitoring well will <br /> need to be developed,by pumping to clear water,before col lecting and analyzfng a sample for Total <br /> Petroleum Hydrocarbons EPA method 801$(modified)and EPA method 602. <br /> Thorough site notes and boring logs will be made during the course of field work, This fnformat ion <br /> along with the analytical data,will be the basis for preparing the report after project complotion. <br /> to <br /> _- QualIty-.Assurence-Program <br /> -- -- -- — -- - — ---- ----The following measures will betaken to insure that a high quality study Is conducted and that cross <br /> !�;' contamination will not occur. . <br />