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(YVATC <br /> A S S O C I A T E S I N C <br /> and a sample was collected from.m each well using a disposable bailer Groundwater well purge <br /> and sample logs are contained in Attachment 1 <br /> The groundwater samples collected from the wells were submitted to State certified Argon <br /> Laboratories (FLAP Cert No 2359) for chemical analysis of TPHg, total petroleum <br /> hydrocarbons as diesel (TPHd), and total petroleum hydrocarbons as kerosene (TPHk) utilizing <br /> EPA method 8015 modified, BTEX utilizing EPA method 8020, and oxygenate fuel additives <br /> including methyl tert-butyl ether(MTBE)utilizing EPA method 8260 <br /> ANALYTICAL RESULTS <br /> The groundwater samples collected from wells MW1 and MW2 contained detectable <br /> concentrations of TPHg at 96 micrograms per liter, gg/L, and 130 Vg/L, respectively <br /> MTBE was detected in well MW2, at a concentration of 8 5 gg/L No other fuel additives were <br /> detected above laboratory method reporting limits including t-butanol, di-isopropyl ether, ethyl t- <br /> butyl ether, t-amyl methyl ether, 1,2-dichloroethane, and 1,2-dibromoethane <br /> Groundwater matrix samples from wells MW3, MW4, MW5, MW6, and MW7 did not contain <br /> concentrations of TPHg, TPHd, TPHk, BTEX compounds, or fuel oxygenates above the <br /> laboratory reporting limits Analytical results for groundwater matrix samples are contained in <br /> Table 2 Laboratory data sheets and chain-of-custody documentation are contained in <br /> Attachment 2 <br /> CONCLUSIONS <br /> Concentrations of petroleum hydrocarbons in wells MW1 and MW2 were within the historical <br /> range as established by previous sampling events but have generally decreased over time <br /> (Figures 4 and 5) Concentrations of petroleum hydrocarbons remained below laboratory <br /> reporting limit at wells MW3, MW4, MW5, MW6, and MW7 <br /> TPHd and TPHk have not been detected in any of the wells for the last four quarters in wells <br /> MW1 through MW4 and since wells MWS through MW7 were installed The lateral extent of <br /> the petroleum hydrocarbon plume in groundwater appears to be receding <br /> RECOMMENDATIONS <br /> Based on the results of the second quarter 2003 monitoring event and the general trend of <br /> _ decreasing concentrations of petroleum hydrocarbons in wells MW1 and MW2 since December — <br /> 1999, we recommend that the site be granted "No Further Action" (NFA) status <br /> w lwordpro16257712QR-2003 doc 3 <br />