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1 ' Site Background Information Yamada Brothers Page 2 of 2 ' SITE ASSESSMENT ACTIVITIES ' In October 1998, five soil probe borings were advanced at the site for collection of soil and grab ground water samples TPH-d was detected in one soil sample at a concentration of 10 milligrams ' per kilogram(mg/kg) and in five grab ground water samples at concentations as high as 2,700 �Lg/l Methyl tertiary-butyl ether (MTBE) was detected in four of the five grab ground water samples at concentrations as high as 25 µg/1 No other analytes of concern were detected in the soil and grab ' ground water samples collected during the October 1998 investigation In November 1999, three ground water monitoring wells were Installed at the site Low ' concentrations of MTBE have been detected in samples collected from the three ground water monitoring wells and a domestic well at the site No other analytes of concern have been detected in ground water samples since monitoring began in November 1999 On 13 April 2001 AGE ' personnel made a site visit to identify a potential source for the MTBE contamination, no apparent above-ground source was located rIn October 2001, four soil probe borings were advanced at the site for collection of grab ground water samples MTBE was detected in one grab ground water sample at a concentration of 7 µg/1 The lateral extent of MTBE was defined to the north, but has not been defined to the east, west or ' . south r In April 2004, four ground water monitoring wells were installed at the site to total depths of 25 feet bsg MTBE was detected in one soil sample at a concentration of 0 060 mg/kg (MW5-10) Hydrocarbon-like odors were detected in the soil collected from MW-4 at 10, 15 and 20 feet bsg,but r there were no detections in the laboratory results These odors may have been due to hydrocarbon- impacted ground water in the saturated soil r r r r r Advanced CeoEnvironmental,Inc I