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CV*-ATC <br /> ASSOCIATES I NC <br /> ANALYTICAL RESULTS <br /> The groundwater samples collected from wells MW1 and MW2 contained detectable <br /> concentrations of TPHg and BTEX The samples from wells MW1 and MW2 also contained <br /> detectable concentrations of unidentified extractable hydrocarbons Additionally, the <br /> groundwater sample collected from well MW 1 contained a detectable concentration of TPHk <br /> Only benzene exceeded its maximum contaminant level (MCL) of 1 part per billion <br /> MTBE was detected in wells MWI and MW2 above the MCL No other oxygenate fuel <br /> additives were detected above laboratory method detection limits including ethanol, t-butanol, di- <br /> isopropyl ether, ethyl t-butyl ether, and t-amyl methyl ether <br /> Samples from wells MW3 and MW4 were nondetect Analytical results for groundwater are <br /> summarized in Table 2 Laboratory data sheets and chain-of-custody documentation are <br /> contained in Attachment 2 <br /> CONCLUSIONS <br /> Concentrations from wells MW 1 and MW2 have generally remained consistent with the previous <br /> sampling event in September 2000, and concentrations from wells MW3 and MW4 have <br /> remained nondetectable The groundwater elevation has decreased since September 2000 <br /> RECOMMENDATIONS <br /> Based on the results of the fourth quarter 2000 monitoring event, we recommend the following <br /> • Conduct First Quarter 2001 groundwater monitoring and sampling of wells MW 1 through <br /> MW4 in March 2001 and analyze the samples for TPHg, TPHd, TPHk, BTEX, and fuel <br /> oxygenates <br /> • Prepare a workplan for the installation of vapor wells and perform a vapor extraction pilot <br /> test <br /> W <br /> 1625771reponsl4"'-2000 doe 3 <br />