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Mr Kenneth Earnest <br /> April 13, 1995 • <br /> Page 2 <br /> Ground Water Sample Analytical Results <br /> Ground water monitoring wells MW-1, MW-2, MW-4, and MW-5 were purged and sampled <br /> using disposable bailers on March 2, 1995, in accordance with the procedures outlined in <br /> Enclosure A Monitoring well MW-3 is continuously purged by the in-well pump, it is, <br /> therefore, sampled from a valve located at the well head Field observations and ground water <br /> sampling documentation are contained in Enclosure B Ground water samples collected on <br /> March 2, 1995, were submitted to a state-certified laboratory for analysis of benzene, toluene, <br /> ethylbenzene, xylenes (BTEX), and total petroleum hydrocarbons as gasoline (TPHg) Ground <br /> water sample analytical results are compiled in Table 2 Ground water samples collected on <br /> March 2, 12P5, from monitoring wells MW-2 and MW-5 were also submitted for analysis of <br /> halogenated volatile hydrocarbons, in generaaccordan^e ith U S Environmental Protection <br /> Agency (EPA) Method 601 Copies of the certified laboratory analytical reports from the March <br /> 2, 1995, sampling event are presented in Enclosure C <br /> Discussion <br /> Concentrations of dissolved benzene in ground water samples collected on March 2, 1995 ranged <br /> from less than 0 50 microgram per liter (µg/1) in the samples collected from monitoring wells • <br /> MW-1 and MW-4, to 1 8 µg/1 in a sample collected from monitoring well MW-2 TPHg <br /> concentrations ranged from less than 50 µg11 in the samples collected from monitoring wells <br /> MWA, MW-3, and MW-4 to 330 µg11 in the sample collected from monitoring well MW-2 <br /> An inferred benzene isoconcentration map based on the March 2, 1995, ground water sample <br /> analytical results is illustrated on Figure 4 <br /> Ground water samples collected on March 2, 1995, from monitoring wells MW-2 and MW-5, <br /> did not contain detectable concentrations of halogenated Klatile hydrocarbons <br /> As of March 13, 1995, the installed pump in monitoring well MW-3 had recovered 180,069 <br /> gallons of ground water As of the same date, the vapor extraction system had removed <br /> approximately 12,914 pounds of petroleum hydrocarbons <br /> Remarks <br /> The opinions and conclusions contained in this letter report represent our professional opinions <br /> These opinions are based on currently available information and were developed in accordance <br /> with currently accepted hydrogeologic and engineering practices at this time Other than this, <br /> no warranty is implied or intended <br /> ACTON• <br /> MICKELSON• lrpL053 dine <br /> van VAM, INC <br /> Consulting Scientists,Engineers,and Geologists <br />