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no records of the UST removal are available with the Tracy Fire Department, Tracy Building Department or the EHD. PREVIOUS SUBSURFACE INVESTIGATIONS On 04 May 2000,five soil probe borings were advanced at the site under the observation of an EHD 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 a`grab'groundwater sample were collected and analyzed from each soil boring. TPH-g was detected in soil samples from the former dispenser areas and former UST excavation;the depth limits ofhydrocarbon-impacted soil was approximately 15 feet bsg and above 20 feet bsg. Table 1 summarizes the analytical data of the soil sample analyzed. TPH-g was detected in all grab ground water samples at concentrations ranging from 370 µg/1 in sample Bl-H2O to 55,000 µg/1 in sample B3-H2O. Benzene was detected in all samples except B5-H20 at concentrations ranging from 0.54 µg/1 in sample B1-H20 to 160 µg/1 in sample B3-H20. Toluene was detected in all five ground water samples at concentrations ranging from 11 to 25 µg/1. Ethylbenzene was detected in sample 133-H20 at 58 µg/1 and sample B4-H2O at 2.5 µg/l.Xylenes were only detected in samples 132-1-120,B3- _ H2O and B4-H20 at concentrations of 230 µg/1, 120 µg/1 and 1.9 µg/1,respectively. MTBE was not detected in any of the ground water samples. hi addition, the remaining fuel oxygenates were not detected in sample B3-H20. a Benzene concentrations exceed the State of California,Department ofHealth Services action level for drinking water in samples collected from boring B2, B3 and B4. On 22 July 2003, four soil probe borings (136-139) were advanced in the western boundary of the property on Adams Street.The probe borings were advanced to a total depth of 17 feet below surface grade(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 B7-139, and a `grab' ground water sample was collected at the water table. • TPH-g was detected in all soil samples at concentrations ranging from 17 milligrams per kilogram(mg/kg) in sample 138-13 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 (136-12). Benzene and toluene were detected only in sample 138-13 at concentrations of0.02 mg/kg and 0.01 mg/kg,respectively. Benzene was detected in soil boring water samples B8 and B9 at 8.4 µg/I and 80 µg/1, 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 µg/1 and 1,800 gg/l, in sample B6. Advanced CmEnvironmentd,Inc.