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C IVvATC <br /> A S S O C I A T E S I N C <br /> The groundwater samples collected from the wells were submitted to State certified Argon <br /> Laboratories (FLAP Cert No 2359) for chemical analyses of TPHg, total petroleum <br /> hydrocarbons quantified as diesel (TPHd), and total petroleum hydrocarbons quantified as <br /> kerosene (TPHk) utilizing EPA Method 8015B, BTEX utilizing EPA Method 802113, and <br /> oxygenate fuel additives including methyl tert-butyl ether (MTBE) utilizing EPA method 8260B <br /> ANALYTICAL RESULTS <br /> i Petroleum hydrocarbons were detected in the groundwater samples collected from MMI and <br /> MW2 MTBE was detected in the groundwater samples collected from MW1 and MW2 at <br /> concentrations of 4 6 and 14 micrograms per liter (gg/L), respectively TPHg was detected in the <br /> groundwater sample collected from MW2 at a concentration of 85 gg/L <br /> Groundwater samples collected from wells MW3, MW4, MW5, MW6, and MW7 did not <br /> contain concentrations of TPHg, TPHd, TPHk, BTEX constituents, or fuel oxygenates at or <br /> above the laboratory reporting limits Analytical results for groundwater samples are contained <br /> in Table 2 Laboratory data sheets and chain-of-custody documentation are contained in <br /> Attachment 2 <br /> CONCLUSIONS <br /> Concentrations of petroleum hydrocarbons in groundwater samples collected from MWl and <br /> MW2 are within the historical range as established by previous sampling events but have <br /> generally decreased over time Concentrations of petroleum hydrocarbons remained below <br /> laboratory reporting limits in samples collected from MM3, MW4, MW5, MW6, and MW7 <br /> TPHk has not been detected in samples collected from wells MW1, MM2, and MW3 since at <br /> least 2000 TPHo has not been detected in samples collected from wells MW1 through MW4 <br /> since at least March 2001 TPHk has never been detected in samples collected from wells MW4 <br /> through MW7 THPd has never been detected in samples collected from well s MW5 through <br /> MW7 The lateral extent of the petroleum hydrocarbon plume in groundwater appears to be <br /> receding <br /> w%257711QR-2004 doc <br />