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h <br /> 11 ! <br /> /A <br /> A S S O C I A T E S I N C <br /> 4�2 Groundwater Analytical Results <br /> The groundwater samples collected from wells MW1 and MW2 contained detectable <br /> concentrations of TPHg, TPHd, TPW and BTEX Only benzene exceeded the maximum <br /> contammant level (MCL) of 1 part per billion The sample collected from well MW3 contained <br /> low concentrations of TPHd, TPW toluene and xylenes <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 3 Laboratory data sheets and chain-of-custody <br /> documentation are contained in Appendix C <br /> ' 5.0 DISCUSSION <br /> Based on the analytical results and field observations, the soil and groundwater beneath the <br /> location of the former 3,000-gallon UST are impacted by petroleum hydrocarbons The extent of <br /> impacted soil appears to be limited to depths above 45 to 50 feet bgs in the immediate vicinity of <br /> the former tank and limited to depths between 35 and 50 feet bgs in the vicinity of boring MM2 <br /> None of the soil samples contained oxygenate fuel additives The extent of petroleum <br /> hydrocarbons in soil is presented on Figure 4 <br /> The extent of impacted groundwater appears to be limited to a distance of 20 feet from the former <br /> UST in the southwest to southeast directions The extent of petroleum hydrocarbons in <br /> groundwater is presented on Figure 5 <br /> w\62577epos i am 5 <br />