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Site Background Information: Moore Truck Lines Page 2 of 3 gasoline; the other 5,000-gallon tank contained gasoline for twenty-five years and then contained diesel for twelve years; the 500-gallon tank was reportedly utilized for waste oil storage. The USTs were removed from three separate excavations located near the repair facility (Figure 2). • Upon removal of the USTs, soil samples were collected from the floors of the excavations at depths between 8 feet and 14 feet below surface grade (bsg). Copies of all manifests and scale tags are included in the AGE-prepared Preliminary Investigation and Evaluation Report dated 15 September 1999. Total petroleum hydrocarbons quantified as gasoline (TPH-g)were detected at concentrations as high as 29,800 milligrams per kilogram(mg/kg); volatile aromatics (benzene, toluene ethylbenzene and xylenes: BTEX)were detected at concentrations as high as 2,00 mg/kg; and methyl tertiary butyl ether (MTBE)was detected at concentrations as high as 9.1 mg/kg./Trichloroethene (TCE) was also detected in a soil sample collected beneath UST (No. 4) at a concentrations of 220 microgram per kilogram (gg/kg). Tetrachloroethene (PCE) and TCE were also detected in a soil sample collected from the UST (No. 4) stockpile at concentrations of 2,100 gg/kg and 490 µg/kg, respectively. Results of soil samples from the UST removal are summarized in Tables 3 and 4. Figure�3"shows the approximate locations of the UST removal soil samples. • In June 1999, soil and ground water assessment activities were conducted at the site. A total of five soil borings were completed, grab ground water and soil samples were collected for analysis, and one monitoring well (B 1/MW-1) was installed to 64 feet bsg (Figure 2). TPH-g was detected in soil sample B1-40' at a concentration of 1.6 mg/kg.'Additionally, BTEX compounds were detected in sample B 1-40' at concentrations as high as 0.20gg The fuel oxygenate MTBE was detected at concentrations of 3,400 micrograms per kilogram (ug/kg) and 67 ug/kg in samples B 1-30' and B2-30','respectively. TPH-d and TPH-motor oil (mo) were not detected in the soil samples analyzed. A total of three grab ground water samples were submitted for analysis. TPH-g was detected in the ground water sample collected from boring B 1, at a concentration of 2,400 micrograms per liter(ug/l). TPH-g was not detected in the grab ground water samples collected from borings B2 and B5.BTEX compounds were detected in grab ground water samples collected from B 1 and B2 at concentrations as high as 170 ug/l and 1.7 ug/l, respectively. BTEX compounds were not detected in sample B5-W.-Analytical results of the soil and water samples collected during June 1999 are displayed in TablesAa d 6. � • During the period from June 1999 through September 2000, four ground water sampling events of monitoring well MW-1 were conducted at the site. During each quarter, laboratory analysis of the ground water sample collected from monitoring well MW-1 detected concentrations of TPH-g and MTBE. Tertiary butanol (TBA) and BTEX components were detected at relatively low concentrations for at least two of the four sampling events. Advanced GeoEnviron mental,Inc.