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Mr. Kenneth Earnest <br /> August 2, 1994 <br /> Page 2 <br /> Ground Water Sample Analytical Results <br /> Ground water samples were collected from monitoring wells MW-1 through MW-5 on <br /> May 31, 1994, using the procedures outlined in Enclosure A. Field observations and ground <br /> water sampling documentation are presented in Enclosure B. Ground water samples collected <br /> on May 31, 1994, 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 were also <br /> collected on May 31, 1994, from monitoring wells MW-2 and MW-5 and submitted for analysis <br /> of halogenated volatile hydrocarbons in accordance with U.S. Environmental Protection Agency <br /> (EPA) Method 601. Copies of the certified laboratory analytical reports from the May 31, 1994, <br /> sampling event are presented in Enclosure C. <br /> Discussion <br /> Concentrations of dissolved benzene in ground water samples collected on May 31, 1994, ranged <br /> from 1.0 microgram per liter (µg11) in a sample collected from monitoring well MW-1 to 26 Pgll <br /> in a sample collected from monitoring well MW-3. TPHg concentrations ranged from less than <br /> detectable in a sample from monitoring well MW-1 to 390 µg/l in the sample collected from <br /> monitoring well MW-2. An inferred benzene isoconcentration map based on the May 31, 1994, <br /> ground water sample analytical results is illustrated on Figure 4. <br /> Ground water samples collected on May 31, 1994, from monitoring wells MW-2 and MW-5, <br /> did not contain detectable concentrations of halogenated volatile hydrocarbons. <br /> As of the May 31, 1994 sampling event, the installed pump in monitoring well MW-3 has <br /> recovered 70,858 gallons of ground water. As of the same date, the vapor extraction system <br /> has recovered approximately 11,068 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 /> i� ACTON • 1rpt026.maf <br /> MICKELSON• <br /> van DAM,INC. <br /> Consulting Scientists,Engineers,and Geologists <br />