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Ms Marla Guensler <br /> October 14, 1992 <br /> Page 3 <br /> Ground water monitoring wells MW-1 through MW-6 were sampled on September 28, 1992 Each <br /> well was purged prior to sampling by removing approximately three well volumes of water After <br /> purging and after the water levels were allowed to stabilize, a water sample was collected from each <br /> monitoring well using a clean plastic disposable bailer Ground water sampling procedures are <br /> described in 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 /> September 28, 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 Xylene TPHga <br /> MW-1 08/29/91 <05 <0 5 <05 <0 5 <50 <br /> 12/13/91 <05 <0 5 <0 5 <05 75 <br /> 03/18/92 <05 <0 5 <05 <05 <50 <br /> 06/04/92 1 1 <05 <0 5 <05 <50 <br /> 09/28/92 6 3 <0 5 <0 5 <05 <50 <br /> MW-2 08/29/91 <0 5 <0 5 49 <0 5 82 <br /> 12/13/91 <05 <0 5 <05 <05 <50 <br /> 03/18/92 09 <05 <05 <05 <50 <br /> 06/04/92 <05 <05 <0 5 <0 5 <50 <br /> 09/28/92 <05 <0 5 <05 <05 <50 <br /> MW-3 08/29/91 240 3 4 <25 3 5 630 <br /> 12/13/91 270 8 0 <0 5 <05 560 <br /> 03/18/92 79 0 5 07 <0 5 170 <br /> 06/04/92 25 <05 <0 5 <0 5 87 <br /> 09/28/92 300 5 9 5 1 7 3 680 <br /> MW-4 02/10/92 <0 5 09 <0 5 09 91b <br /> 03/18/92 <05 <0 5 <0 5 <0 5 9ic <br /> . 06/04/92 06 <05 <05 <0 5 67 <br /> 09/28/92 <05 <0 5 <05 <05 91 <br />