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(VYA, TC A S S O C I A T E S I N C and a sample was collected from each well using a disposable bailer Groundwater well purge and sample logs are contained in Attachment 1 The groundwater samples collected from the wells were submitted to State certified Argon Laboratories (FLAP Cert No 2359) for chemical analysis of total petroleum hydrocarbons as gasoline (TPHg), total petroleum hydrocarbons as diesel (TPHd), and total petroleum hydrocarbons as kerosene (TPHk) utilizing EPA method 8015 modified, benzene toluene, ethylbenzene, and xylenes (BTEX) utilizing EPA method 8020, and oxygenate fuel additives including methyl tert butyl ether (MTBE) utilizing EPA method 8260 ANALYTICAL RESULTS The groundwater samples collected from wells MW 1 and MW2 contained detectable concentrations of TPHg at concentrations of 170 Eig/L and 260 µg/L, respectively Benzene was detected at wells MW1 and MW2 at concentrations of 0 7 µg/L, and 1 8 µg/L, respectively Ethylbenzene and xylenes were detected at well MM2 at trace levels Benzene exceeded the maximum contaminant level (MCL) of 1 Rg/L at well MW2 MTBE was detected in wells MW1 and MW2 above the MCL, at concentrations of 19 lig/L and 24 pg/L, respectively No other fuel additives were detected above laboratory method reporting limits including t-butanol, di-isopropyl ether, ethyl t-butyl ether, t-amyl methyl ether, 1,2- dichloroethane, and 1,2-dibromoethane Groundwater matrix samples from wells MW3, MW4, MW5, MW6, and MW7 did not contain concentrations of TPHg, TPHd, TPHk, BTEX compounds, or fuel oxygenates above the laboratory reporting limits Analytical results for groundwater matrix samples are contained in Table 2 Laboratory data sheets and chain-of-custody documentation are contained in Attachment 2 CONCLUSIONS Concentrations of petroleum hydrocarbons in wells MW 1 and MW2 were within historical parameters as established by previous sampling events but have generally decreased over time Concentrations of petroleum hydrocarbons remained below laboratory reporting limit at wells MW3, MW4, MW5, MW6, and MW7 The groundwater elevation decreased since December 2001 The direction of the groundwater gradient was toward the south RECOMMENDATIONS Based on the results of the fourth quarter 2002 monitoring event, we recommend the following Continue with quarterly monitoring and sampling of wells MW 1 through MW7, and analyze samples for TPHg, TPHd, TPHk, BTEX, and fuel oxygenates w lwordpro16257714QR-2002 doe 3