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Ile <br /> Kiff analyzed the groundwater samples for Total Petroleum Hydrocarbons (TP H)-as-g aso line, <br /> benzene, toluene, ethylbenzene, xylenes (BTEX), MTBE, di-isopropyl ether(DIPE), ethyl-t-butyl <br /> ether (ETBE), tert-amyl methyl ether (TAME), tert-butanol (TBA) and 1,2-DCA by EPA Method <br /> 8260B The laboratory report and chain-of-custody document are included as Appendix A <br /> ' Analytical results of the groundwater samples indicate that dissolved concentrations of gasoline <br /> hydrocarbons continue to exist in groundwater beneath the site TPH-as-gasoline was only <br /> detected in the groundwater sample collected from VW-2D at a concentration of 66 µg11 MTBE <br /> was detected six of the nine monitoring wells at a maximum concentration of 190 µg11 at MW-7 <br /> 1 As shown on the isoconcentration map for MTBE in groundwater (Figure 4), the lateral extent of <br /> MTBE is not defined north and northeast (downgradient) of the former UST Groundwater from <br /> Irrigation Well #2 did not contain detectable concentrations of any of the gasoline constituent <br /> compounds analyzed The cumulative analytical results are summarized in Table 2 <br /> 23 Wastewater Disposal <br /> On November 7, 2001, Ramos Environmental Services (Ramos) removed the wastewater from <br /> eight, 55-gallon drums using a vacuum truck The wastewater was generated during the <br /> monitoring well purging and sampling conducted over the past four quarters <br /> lie Ramos transported the wastewater as non-RCRA hazardous waste liquid (oily water) to its <br /> recycling facility in West Sacramento, California A copy of the waste manifest is included as <br /> Appendix B <br /> r <br /> • 6 <br />