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rSITE ASSESSMENT ACTWITIES <br />' In October 1998, five soil probe bonngs were advanced at the site for collection of soil and grab <br /> ground water samples TPH-d was detected in one soil sample at a concentration of 10 milligrams <br /> per kilogram(mg/kg) and in five grab ground water samples at concentatxons as high as 2,700 pg/l <br />' Methyl tertiary-butyl ether(MTBE) was detected in four of the five grab ground water samples at <br /> concentrations as high as 25 ug/l No other analytes of concern were detected in the soil and grab <br /> ground water samples collected during the October 1998 investigation <br />' In November 1999, three ground water monitoring wells were installed at the site Low <br /> concentrations of MTBE have been detected in samples collected from the three ground water <br />' monitoring wells and a domestic well at the site No other analytes of concern have been detected <br /> in ground water samples since monitoring began in November 1999 On 13 April 2001 AGE <br /> personnel made a site visit to identify a potential source for the MTBE contamination, no apparent <br />' above-ground source was located <br /> In October 2001, four soil probe borings were advanced at the site for collection of grab ground <br />' water samples MTBE was detected in one grab ground water sample at a concentration of 2 7 µg/1 <br /> The lateral extent of MTBE was defined to the north, but has not been defined to the east, west or <br /> south <br /> 1 <br /> 1 <br /> 1 Advanced GeoEnvimnmcntal,Inc <br />