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' 15 .lune 1999 . AGE-NC Project No 98-0450 ' Page 4 of 27 ' Significant benzene concentrations were also detected below the former northern dispenser island at depths of 25 feet bsg to 35 feet bsg The greatest concentrations of MTBE were detected in soil below the former USTs at depths of 15 feet bsg to 30 feet bsg MTBE was detected in soil samples from SB 1, SB4, SB5, SB6 and SB7 The highest concentration, 9,200µg/kg, was detected at a depth of 30 feet bsg in the former UST area nn soil boring SB4 • The greatest concentrations of TBA were detected in soil below the former USTs and in the area of the former northern dispenser Island at depths of 25 feet bsg to 35 feet bsg, in general ' ETBE was also detected below the former northern dispenser island ' 243 Hydrocarbon Impacted Ground Water ' Analytical results of the ground water sample analyzed are summarized in Tables 3 and Table 4 • The plume of impacted ground water is constrained on its northern edge by the grab ground water sample collected from soil boring SB2 • The plume of impacted ground water above 10 µg/1 of benzene is constrained on its western ' edge of the former USTs by wells BMW-1, BMW-2 and BMW-3 • The plume of impacted ground water above 10 ,ug/l of benzene is constrained on its eastern ' and southeaster edge of the former USTs by wells BMW-5 and somewhat on the south by well MW-5 • Significant concentrations of dissolved benzene and MTBE reside in former UST area • The ground water flow direction has been generally south and slightly southeast over thep ast two years of ground water monitoring ' 2 5 SITE HYDROGEOLOGIC CONDITIONS Information collected from the site over the past four years indicts that the ground water flow at the site Is directed to the south The depth to ground water measured in site monitoring wells and soil -borings-ranged from approximately 45 to 55 feet bsg Adtiunced GcoEmironmental,Inc