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1 <br /> x <br /> (- \TATc <br /> A S S O C I A T E S I N C <br /> ANALYTICAL RESULTS <br /> The groundwater samples collected from wells NMI and MW2 contained detectable <br /> concentrations of TPHg and BTEX The samples from wells MW1 and MW2 also contained <br /> detectable concentrations of an unidentified hydrocarbon Only benzene exceeded the maximum <br /> contaminant level (MCL) of 1 part per billion <br /> MTBE was detected in wells MW 1 and MW2 above the MCL No other oxygenate fuel additives <br /> were detected above laboratory method detection limits including ethanol, t-butanol, di-isopropyl <br /> 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 MW1 and MW2 have generally remained consistent with the previous <br /> sampling event in June 2000, and concentrations from wells MW3 and MW4 have remained <br /> nondetectable The groundwater elevation has decreased since June 2000 <br /> RECOMMENDATIONS <br /> Based on the results of the third quarter 2000 monitoring event, we recommend the following <br /> o Conduct Fourth Quarter groundwater monitoring and sampling of wells MWl through <br /> MW4 in December 2000 and analyze the samples for TPHg, TPHd, TPHk, BTEX, and <br /> fuel oxygenates <br /> w w2577VeporfOrd-2000 doe 3 <br />