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f <br /> Kiff analyzed the groundwater samples for Total Petroleum Hydrocarbons (TPH)-as-gasoline, <br /> benzene, toluene, ethylbenzene, xylenes (BTEX), methyl-t-butyl ether (MTBE), ditsopropyl ether <br /> (DIPS), ethyl-t-butyl ether(ETBE), tert-amyl methyl ether (TAME), ter#-butanol (TBA) and 1,2- <br /> dichloroethane (1,2-DCA) by EPA Method 8260B The laboratory reports and chain-of-custody <br /> documents are included as Appendix A <br /> 1 <br /> Analytical results of the groundwater samples indicate that dissolved concentrations of gasoline <br /> hydrocarbons continue to exist in groundwater beneath the site Groundwater sampled from <br /> VW-2 contained 760 parts per billion (ppb) of TPH-as-gasoline, 24 ppb of benzene, 30 ppb of <br /> toluene, 55 ppb of ethylbenzene, 26 ppb of xylenes, 410 ppb of MTBE, 64 ppb of TBA and 37 <br /> ppb of 1,2-DCA Groundwater sampled from VW-1 only contained detectable concentrations of <br /> MTBE at 6 8 ppb Groundwater sampled from MW-6 and MW-7 did not contain detectable <br /> concentrations of gasoline constituent compounds The historical analytical results from (1990 <br /> through 1998) are summarized in Table 2 The most recent analytical results (1999) are <br /> summarized in Table 3 <br /> t� <br /> I <br /> �1 <br /> 5 <br />