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Mr Kenneth Earnest January 10, 1995 Page 2 Ground Water Sample Analytical Results Ground water monitoring wells MW-1, MW-2, MW-4, and MW-5 were purged and sampled using disposable bailers on November 16, 1994, in accordance with the procedures outlined in Enclosure A Monitoring well MW-3 is continuously purged by the unwell pump, therefore, _ it is sampled from a valve located at the well head Field observations and ground water sampling documentation are contained in Enclosure B Ground water samples collected on November 16, 1994, were submitted to a state-certified laboratory for analysis of benzene, toluene, ethylbenzene, xylenes (BTEX), and total petroleum hydrocarbons as gasoline (TPHg) Ground water sample analytical, results are compiled in Table 2 Ground water samples collected on November 16, 1994, fromtr,;tonitonng wells MW-2 and MW-5 and were also submitted for analysis of halogenated✓volatile hydrocarbons in accordance with U S Environmental Protection Agency (EPA) Method 601 Copies of the certified laboratory analytical reports from the November 16, 1994, sampling event are presented in Enclosure C Discussion Concentrations of dissolved benzene in ground water samples collected on November 16, 1994, ranged from less than 0 50 microgram per liter (µg11) in the samples collected from monitoring wells MW-1, MW-4, and MW-5 to 4 6 µg/l in a sample collected from monitoring well MW-2 TPHg concentrations ranged from less than detectable in the samples collected from monitoring wells MW-1, MW-3, and MW-4 to 290 µg11 in the sample collected from monitoring well MW-2 An inferred benzene isoconcentration map based on the November 16, 1994, ground water sample analytical results is illustrated on Figure 4 Ground water samples collected on November 16, 1994, from monitoring wells MW-2 and MW-5, did not contain detectable concentrations of halogenated volatile hydrocarbons As of December 7, 1994, the installed pump in monitoring well MW-3 has recovered 134,230 gallons of ground water As of the same date, the vapor extraction system has recovered approximately 12,77 pounds of petroleum hydrocarbons Remarks The opinions and conclusions contained in this letter report represent our professional opinions These opinions are based on currently available information and were developed in accordance with currently accepted hydrogeologic and engineering practices at this time Other than this, no warranty is implied or intended . ACTON • MICKELSON van DAM, INC Gpu79 mj Consulting SClentk5ts. Engineers,and Geologists