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Project No 014-95262 <br /> Page No 12 <br /> 16 pesticides and PCBs This analysis was prompted by the classification by the analytical laboratory of an <br /> atypical pattern on the chromatograms for some of the TPH-D samples The results of the analysis for <br /> semi-volatile organic constituents was the detection of only one compound [bis(2-ethylhexyl)phthalate] at <br /> a concentration of 150 µg/L <br /> k <br /> 8.0 DISCUSSION OF FINDINGS <br /> I Review of soil and groundwater chemical data and its relation to potential on-site sources of soil <br /> and/or groundwater degradation allow certain observations to be made These observations are discussed <br /> below and are listed by the specific area investigated <br /> t <br /> 8.1 <br /> TPH-D was detected at concentrations of 3 6 to 1 0 mg/kg at the two northern sample locations <br /> i (KHA-4 and KHA-5) Although the vertical extent of TPH-D in soil has not been determined, based upon <br /> soil types present, it is probably limited vertically Other considerations are that the potential source of <br /> release (diesel lines) are no longer used and the vicinity is capped by the building or extensive driveway <br /> ' areas The concentrations noted in these two borings suggests the lateral extent of diesel affected soil is <br /> limited However, additional and deeper soil boring(s) and chemical sampling are the only absolute <br /> methods to prove the presence of TPH-D is laterally and vertically limited <br /> 8.2 Eggavaon Spoils <br /> A maximum concentration of 32 mg/kg TPH-D was noted in samples in areas used to stockpile or <br /> eventually dispose of spoils generated during UST overexcavation Other sample concentrations were <2 <br /> mg/kg to non detect Based upon these results it appears that leaching of TPH-D below stockpile areas did <br /> not occur and that TPH-D remaining in remediated spoils does not pose a threat to health and safety or to <br /> soil or groundwater resources <br /> 8.3 Vault at Brine Tank <br /> 1 <br /> One sample was collected from 6 to 12 inches below the earthen floor of the vault (KH-6) <br /> Chloride was present at a concentration of 12,000 mg/kg It is possible that the vault contains a concrete <br /> floor below the maximum depth investigated -- this must be determined at a later date If present, a floor <br /> KRAZAN& ASSOCIATES, INC <br /> Offices Semng the Western Unwed States <br /> 95262 Ps2 <br />