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SITE ASSESSMENT ACTIVITIES <br /> i <br /> In October 1998, five soil probe borings 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 concentations as high as 2,700µg/1 <br /> Methyl tertiary-butyl ether(MTBE) was detected in four of the five grab ground water samples at <br /> concentrations as high as 25 µg/1 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 /> E 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 7µg/1 <br /> The lateral extent of MTBE was defined to the north, but has not been defined to the east, west or <br /> E south <br /> I • <br /> E <br /> E <br /> E <br /> E <br /> E <br /> I <br /> I <br /> I <br /> Advanced GeoEnvironmental,Inc <br /> I <br />