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CvvAT <br /> . A S S O C I A T E S I N C <br /> ANALYTICAL RESULTS <br /> The groundwater samples collected from wells MW 1 and MW2 contained detectable <br /> concentrations of TPHg, TPHk, TPHd, and/or BTEX Only benzene exceeded the maximum <br /> contaminant level (MCL) of I part per billion The sample collected from well MW4 contained a <br /> detectable concentration of an unidentified hydrocarbon(s) Well MW3 was nondetect <br /> Methyl tertiary butyl ether (MTBE) was detected in wells MW 1 and MW2 No other oxygenate <br /> fuel additives were detected above laboratory method detection limits including ethanol, t- <br /> butanol, di-Isopropyl ether, ethyl t-butyl ether, and t-amyl methyl ether Analytical results for <br /> groundwater are summarized in Table 2 Laboratory data sheets and chain-of-custody <br /> documentation are contained In Attachment 2 <br /> CONCLUSIONS <br /> Concentrations from wells MW 1 and MM2 have, in general, slightly Increased since the previous <br /> sampling event in April 2000 with the exception of TPHk In well MW2, witch decreased from <br /> 178 ppb to 950 ppb Concentrations from wells MW3 and MW4 have remained the same or <br /> nondetectable since the previous sampling event with the exception of umdenttfied hydrocarbons <br /> . In well MW4, which Increased from nondetect levels during the previous sampling event to 220 <br /> ppb The groundwater elevation has Increased since April 2000 <br /> RECOMMENDATIONS <br /> Based on the results of the second quarter 2000 monitoring event, we recommend the following <br /> o Conduct Third Quarter groundwater monitoring and sampling of wells W1 through <br /> MW4 in September 2000 and analyze the samples for TPHg, TPHd, TPHk, BTEX' and <br /> fuel oxygenates <br /> i <br /> w+62s77�remM\2aa-2000 aw 3 <br />