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1 <br /> Ms Marla Guensler <br /> January 13, 1993 <br /> Page 3 <br /> Ground water monitoring wells MW-1 through MW-6 were sampled on December 18, 1992 Each <br /> well was purged prior to sampling by removing approximately three well volumes of water After <br /> purging and allowing the water levels to stabilize, a water sample was collected from each monitoring <br /> well using a clean plastic disposable bailer Ground water sampling procedures are described in <br /> Enclosure A <br /> Ground water samples collected from monitoring wells MW-1 through MW-6 were submitted to a <br /> state-certified laboratory for analysis of benzene, toluene, ethylbenzene, and xylenes (BTEX) by <br /> Environmental Protection Agency (EPA) Method 8020 and total petroleum hydrocarbons (TPH) as <br /> gasoline by EPA Method 8015 Analytical results for ground water samples collected since <br /> August 29, 1991, are compiled in Table 2 Copies of the certified laboratory reports for the <br /> December 18, 1992, sampling event are included in Enclosure B <br /> TABLE 2 <br /> GROUND WATER SAMPLE ANALYTICAL RESULTS <br /> Concentrations in Parts per Billion(ppb) <br /> Monitoring Ethyl- <br /> Well Date Benzene Toluene benzene Xylenes TPH�` <br /> MW-1 08/29/91 <0 5 <0 5 <05 <0 5 <50 <br /> 12/13/91 <05 <05 <05 <05 75 <br /> 03/18/92 <0 5 <05 <05 <05 <50 <br /> 06/04/92 1 1 <05 <05 <05 <50 <br /> 09/28/92 63 <05 <05 <05 <50 <br /> 12/18/92 69 06 <05 <05 50 <br /> MW-2 08/29/91 <0 5 <05 4 9 <05 82 <br /> 12/13/91 <0 5 <05 <05 <05 <50 <br /> 03/18/92 0 9 <0 5 <05 <05 <50 <br /> 06/04/92 <0 5 <05 <0 5 <05 <50 <br /> 09/28/92 <0 5 <0 5 <05 <05 <50 <br /> 12/18/92 <0 5 <05 <05 <05 <50 <br /> MW-3 08/29/91 240 3 4 <25 3 5 630 <br /> 12/13/91 270 80 <05 <05 560 <br /> 03/18/92 79 05 07 <05 170 <br /> 06/04/92 25 <0 5 <05 <05 87 <br /> 09/28/92 300 5 9 5 1 7 3 680 <br /> 12/18/92 1,700 150 91 140 4,000 <br />