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I <br /> v <br /> ATC <br /> . A S S O C I A T E S I N C <br /> Ethylbenzene and xylenes were detected at wells MW1 and MW2 at trace levels Benzene <br /> exceeded the maximum contaminant level (MCL) of 1 pg/L at wells MW1 and MW2 <br /> MTBE was detected in wells NMI and MW2 above the MCL, at concentrations of 34µg/L and <br /> 30 gg/L, respectively No other fuel additives were detected above laboratory method reporting <br /> limits including ethanol, t-butanol, di-isopropyl ether, ethyl t-butyl ether, and t-amyl methyl <br /> ether <br /> Groundwater matrix samples from wells MW3 and MW4 did not contain concentrations of <br /> TPHg, TPHd, TPHk, BTEX compounds, or fuel oxygenates above the laboratory reporting <br /> limits Analytical results for groundwater matrix samples are contained in Table 2 Laboratory <br /> data sheets and chain-of-custody documentation are contained in Attachment 2 <br /> CONCLUSIONS <br /> Concentrations of petroleum hydrocarbons in wells MW1 and MW2 were within historical <br /> parameters as established by previous sampling events Concentrations of petroleum <br /> hydrocarbons remained below laboratory reporting limit at wells MW3 and MW4 The <br /> groundwater elevation decreased slightly since March 2001 The direction of the groundwater <br /> Sgradient was toward the south <br /> RECOMMENDATIONS <br /> Based on the results of the second quarter 2001 monitoring event, we recommend the following <br /> Continue with quarterly monitoring and sampling of wells MW1 through MW4, and analyze <br /> samples for TPHg, TPHd, TPHk, BTEX, and fuel oxygenates <br /> W lwordpro16257712QR-2001 doe 3 <br />