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The discrete groundwater sample collected from 75 feet contained 120 micrograms per liter (pg/I) of TPH-as-gasoline, 690 pg/l of MTBE, and 97 µg11 of 1,2-DCA The groundwater sample collected from 90 feet only contained MTBE at 2 9 pg/l, and the groundwater sample collected at 125 feet only contained 1,2-DCA at 0 5 pgll The discrete groundwater sample results are summarized in Table 3 and the laboratory report and chain-of-custody are included in Appendix E Analytical results of the groundwater samples indicate that dissolved concentrations of gasoline hydrocarbons continue to exist in groundwater beneath the site TPH-as-gasoline was only detected in the groundwater sample collected from VW-2 at a concentration of 90 pg/l Benzene was only detected in the groundwater sample collected from MW-2 at a concentration of 0 73 pg/1 The oxygenate compound TBA was only detected in the groundwater sample collected from VW-2 at a concentration of 8 5 µg11 The lead scavenger additive 1,2-DCA was detected in the groundwater samples collected from MW-3, MW-5, MW-7 and VW-2, at a maximum concentration of 18 pg/I in MW-5 The oxygenate compound MTBE was detected in groundwater collected from six of the nine monitoring wells (MW-3, MW-4, MW-5, MW-7, VW-1, and VW-2) The highest concentration of MTBE was detected at 100 µg11 in MW-3 The lateral extent of MTBE in groundwater is shown in Figure 7 The groundwater sample collected from the irrigation well (Well #2) did not contain detectable concentrations of any of the compounds analyzed The cumulative groundwater analytical results are summarized in Table 5 The laboratory reports and chain-of-custody documents are included as Appendix E 10