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n r <br /> Mr. Kenneth Earnest <br /> May 19, 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 /> March 25, 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 March 25, 1994, were submitted to a state-certified laboratory for analysis of benzene, <br /> toluene, ethylbenzene, xylenes (BTEX), and total petroleum hydrocarbons as gasoline (TPHg). <br /> Ground water sample analytical results are compiled in Table 2. Ground water samples were <br /> also collected on March 25, 1994, from monitoring wells MW-1 through MW-5 and submitted <br /> for analysis of halogenated volatile hydrocarbons in accordance with U.S. Environmental <br /> Protection Agency (EPA) Method 601. Copies of the certified laboratory analytical reports from <br /> the March 25, 1994, sampling event are presented in Enclosure C. <br /> Discussion <br /> Concentrations of TPHg in ground water samples collected on March 25, 1994, ranged from less <br /> than detectable in a sample collected from monitoring well MW-1 to 1,500 micrograms per <br /> liter (pg/l) in a sample collected from monitoring well MW-3. Benzene concentrations ranged <br /> from less than detectable in monitoring well MW-1 to 130 pg/l in the sample collected from <br /> monitoring well MW-3. An inferred benzene isoconcentration map based on the <br /> March 25, 1994, ground water sample analytical results is illustrated on Figure 4. <br /> Ground water samples collected on March 25, 1994, did not contain detectable concentrations <br /> of halogenated volatile hydrocarbons for any of the sampled monitoring wells (MW-1 through <br /> MW-5). <br /> As of the March 25, 1994 sampling event, the installed pump in monitoring well MW-3 has <br /> recovered 49,930 gallons of ground water. <br /> Future Work <br /> Quarterly ground water monitoring will continue on the site. The next sampling event is <br /> scheduled for June 1994. <br /> ACTON ImtOO2.maf <br /> MICKELSON• <br /> van DAM,INC. <br /> Consulting Scientists, Engineers,and Geologists <br />