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1 1 Site Background Information Former TRACY DINER ' 95 West 11" Street, Tracy, California ' representative The probe borings were advanced in the former UST excavation, the southern and northern dispenser islands, and two assumed hydrogeologic down-gradient locations All borings were advanced to depths of 20 feet bsg Selected soil samples and one grab ground water sample ' were collected and analyzed from each soil boring • Total petroleum hydrocarbons quantified as gasoline (TPH--g) was detected in soil samples ' from the former dispenser areas and former UST excavation area, the approximate depth limits of hydrocarbon-Impacted soil were between 15 feet bsg and 20 feet bsg Table 3 summarizes the analytical data of the soil samples analyzed ' TPH-g was detected in all grab ground water samples at concentrations ranging from 370 micrograms per liter (µg/l) in sample B1-H20 to 55,000 µg/1 in sample B3-H20 Benzene was detected in all samples exceptB5-H20at concentrations ranging from 0 54µg/1 Iin sample BI-H2O to 160 lig/1 in sample B3-H2O Toluene was detected in all five ground water samples at concentrations ranging from 11 µg/1 to 25 µg/1 Ethylbenzene was detected in sample 133-H20 at 58 µg/1 and in sample B4-H20 at 2 5 µg/1 Xylenes were only detected in samples B2-H20, B3-H20, and B4-1120 at concentrations of 230 µg/1, 120 ag/l, and 1 9 µg/l, respectively MTBE was not detected in any of the ground water samples In addition, the remaining fuel oxygenates were not detected in sample B3-H20 • Benzene concentrations in samples collected from borings B2,B3,and B4 exceeded the State of California, Department of Health Services action level for drinking water On 22 July 2003, four soil probe borings (B6 through B9) were advanced in the western boundary of the property on Adams Street The probe borings were advanced to a total depth of 17 feet bsg Soil samples were collected continuously from the borings at 4-foot intervals,beginning at 2 feet bsg in boring B6 and 5 feet bsg in borings B7, B8, and B9 A grab ground water sample was collected Iat the water table • TPH-g was detected in all soil samples at concentrations ranging from 17 milligrams per I kilogram (mg/kg) in sample B8-13 to 72 mg/kg in sample B7-13 • The BTEX compounds ethylbenzene and xylenes were detected in all samples at maximum concentrations of 0 57 mg/kg (B9-10) and 0 1 mg/kg (B6-12) Benzene and toluene were detected only in sample B 8-13 at concentrations of 0 02 mg/kg and 0 01 mg/kg,respectively • Benzene was detected in soil boring water samples B8 and B9 at 8 4 µg/1 and 80 µg/l, I respectively, toluene was detected in samples B6 and B9 at 10 µg/1 and 16 µg/1, and ethylbenzene and xylenes were detected in all soil boring water samples at maximum concentrations of 3,100 pg/l and 1,800 µg/1 (B6) • The fuel additive MTBE was detected in three of the four soil boring ground water samples at concentrations of 28 µg/1 (B6 and B9) and 8 7 µg/1 (B8) IAdvanced GeoEnvironmental,Inc