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Ethylbenzene, toluene, total xylenes and 1,2-dichloropropane were also <br /> detected in both of these monitoring wells, although at concentrations <br /> below DTSC MCLS for drinking water Naphthalene and isopropylbenzene <br /> were detected in groundwater samples collected from monitoring well <br /> MW-7, however, these are non-regulated compounds at this time There <br /> were no compounds detected at concentrations above DTSC MCLs f o r <br /> drinking water in the groundwater samples collected from monitoring <br /> wells MW-8 and MW-10 However, TPH-D and 1,2-dichloropropane were <br /> detected in groundwater samples collected from both of these monitoring <br /> wells at concentrations below drinking water standards, and toluene and <br /> total xylenes were detected in groundwater samples collected from <br /> monitoring well MW-8 at concentrations below drinking water standards <br /> Since TPH-D would not be expected so far below the water table, and since <br /> these concentrations were noted as having chromatogram patterns n o t <br /> typical of diesel, ASE questioned Chromalab regarding these TPH-D <br /> patterns Upon reviewing the chromatograms, Chromalab stated that all <br /> of the TPH-D detected in the groundwater samples collected from <br /> monitoring wells MW-7 and MW-9 appear to be from miscellaneous <br /> organics most likely not related to petroleum-hydrocarbons Preparing <br /> these samples with a silica gel cleanup during future samplings will <br /> probably remove these organics Most of the TPH-D detected in <br /> groundwater samples collected from monitoring well MW-8 also appeared <br /> to be related to this miscellaneous organic matter However, the TPH-D <br /> detected in groundwater samples collected from monitoring well MW-10, <br /> and some of the TPH-D detected in groundwater samples collected from <br /> monitoring well MW-8, was due to a compound which was not identified <br /> by EPA Method 8260 The extract from the groundwater sample collected <br /> from monitoring well MW-10 was analyzed by EPA Method 8270 in an <br /> attempt to identify this compound The EPA Method 8270 identified the <br /> compound as 1-methyl 2-pyrrolidinine, a compound which is used as both <br /> a solvent and to pesticides Since the holding time had already expired f o r <br /> this sample, the concentration of this compound in this sample could n o t <br /> be quantified <br /> 12 . 0 CONCLUSIONS <br /> Only relatively low concentrations of hydrocarbons and VOCs were <br /> detected in the soil samples collected from the site None of these <br /> concentrations exceeded USEPA PRGs for residential soil <br /> Hydrocarbons and/or VOCs were detected in all of the groundwater <br /> samples analyzed The highest concentrations detected were in <br /> Franks One Stop Report - June 1999 <br /> -11 - <br />