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Analysis of soil samples collected fallowing excavation of seven USTs, associated piping and <br /> dispenser islands, in early 1991, revealed the presence or petroleum hydrocarbons(see <br /> Appendix H for pre-tank removal site diagramf,). All six samples collected frorn .he fuel tank _ <br /> _ excavation revealed petroleum hydrocarbons, with the greatest concentrations (maximum 3500 <br /> Ppm) encountered in the south wall samples. Only one sample collected from the southeast <br /> corner of the used oil tank excava:ion revealed the presence of petroleum hydrocarbons. <br /> Samples collected beneath the fuel tank dispenser piping revealed the presence of <br /> hydrocarbons, with the greatest concentrations (maximum 677 ppm)encountered near the <br /> T southern most dispenser island. Analytical results of excava!ion samples are listed in tabular <br /> form in Appendix I. <br /> Analysis of soil samples collected during the installation of wells MW-5, MW-6,MW-7, <br /> VW-1 and VW-2 revealed the presence of petroleum hydrocarbons in the samples collected <br /> from wells VW-2 and MW-7 only. These are located downgradient of the southern most fuel <br /> dispenser and downgradient of the former fuel tank field,respectively. VW-2 had TPH as <br /> gas to,�50 ppm and MW-7 had only benzene. Analytical results are listed in Table 2 and <br /> depicted on Figure 4. <br /> 3.4 Groundwater Quality Data <br /> Analysis of groundwater samples collected from wellsMW-I, MW-2,MW-3 and AIW-4.in <br /> May 1990 revealed the presence of petroleum hydrocarbons in the samples from wells MW-1 <br /> and MW-3 only. These are located side gradient of the former fueldispenser islands and <br /> downgradient of the former fuel tank field,respectively. Samples collected from wells <br /> ` MW-2 <br /> (upgradient) and MW-4 (downgradient of former used oil tank field)revealed no detectable <br /> concentrations of petroleum hydrocarbons upon analysis. <br /> Analysis of groundwater samples collected from wells MW-5, MW-6 and ?.BIW-7 in August <br /> 1951. revealed the presence of petroleum hydrocarbons in the sample from well MW-7 <br /> (located downgradient of the former fuel tank field)only. Samples from we -5 <br /> lls MW <br /> - <br /> (downgradient of former.used..oil tankfield)-and-MW-6 u -- — - <br /> -' -- — ------------ - -_ ( Fgradient)revealed no detectable ---------- <br /> ? concentrations of petroleum hydrocarbons. Analytical results are listed in Table 3 and <br /> if depicted on Figure 5. <br /> 3.5 Hydrocarbon Distribution <br /> M7J10•21.91NSTMt MMER , <br />