ARCHIVED REPORTS XR0003463 - Laserfiche WebLink

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Ms. Marla Guensler July 8, 1992 Page 3 Ground water monitoring wells MW-i through MW-6 were sampled on June 4, 1992. Each well was purged prior to sampling by removing approximately three well volumes of water After purging and after the water levels were allowed to stabilize, a water sample was collected from each monitoring well using a clean plastic disposable bailer Ground water sampling procedures are described in Enclosure A Ground water samples collected from momtonng wells MW-1 through MW-6 were submitted to a state-certified laboratory for analysis of benzene, toluene, ethylbenzene, and xylenes (BTEX) by Environmental Protection Agency (EPA) Method 8020, total petroleum hydrocarbons (TPH) as gasoline by EPA Method 8015, and Halogenated organics by EPA Method 624 Analytical results for ground water samples collected since August 23, 1991, are compiled in Table 2 Copies of the certified laboratory reports for the June 4, 1992, sampling event are included in Enclosure B TABLE 2 Ground Water Sample Analytical Results Concentrations in Parts per Billion(ppb) Monitoring Ethyl- Well Date Benzene Toluene benzene Xylenes TPH> MW-1 08/29/91 <05 <05 <05 <05 <50 12/13/91 <05 <0 5 <05 <05 75 03/18/92 <05 <05 <05 <05 <50 06/04/92 1 1 <05 <05 <05 <50 MVS'-2 08/29/91 <0 5 <05 49 <05 82 12/13/91 <0 5 <05 <05 <0.5 <50 03/18/92 09 <05 <05 <0.5 <50 06/04/92 <05 <05 <05 <05 <50 MW-3 08/29/91 240 3 4 <2 5 3 5 630 12/13/91 270 8 0 <05 <05 560 03/18/92 79 05 07 <05 170 06/04/92 25 <0 5 <05 <05 87 MW-4 02/10/92 <05 09 <05 09 91b 03/18/92 <05 <05 <0 5 <05 91° 06/04/92 06 <05 <05 <05 67 MW-5 02/10/92 1 9 <05 <05 <05 51d 03/18/92 06 <05 <05 <05 <50e 06/04/92 10 <05 <05 <0.5 <50