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' Site Background Information former Trac Diner g Y ' Page 2 of 3 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 one grab ground water sample ' were collected and analyzed from each soil boring • Total petroleum hydrocarbons quantified as gasoline(TPH-g)were 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 and 20 feet bsg • TPH-g was detected in all grab ground water samples at concentrations ranging from ' 370 micrograms per liter (µg/l) in sample Bl-H20 to 55,000 pg/1 in sample B3-H20 Benzene was detected in all samples except B5-H2O at concentrations ranging from 0 54µg11 ' in sample BI-H2O to 160 µg11 in sample B3-H2O Toluene was detected in all five ground water samples at concentrations ranging from 11 µg/l to 25 µg/l Ethylbenzene was detected in sample 133-1420 at 58 µ.g/1 and in sample 134-1420 at 2 5 µg/1 Xylenes were only detected ' in samples B2-H2O, B3-H2O, and B4-H2O at concentrations of 230 µg/1, 120 µg/l, and 1 9 µg/l,respectively MTBE was not detected in any of the ground water samples analyzed • 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 (136 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 at the water table r • TPH-g was detected in all soil samples at concentrations ranging from 17 milligrams per kilogram (mg/kg) in sample B8-13 to 72 mg/kg in sample B7-13 I • 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), respectively Benzene and toluene were detected in sample 138-13 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 µg11 and 80 µg/1, Irespectively,toluene was detected in samples B6 and B9 at 10µg/l and 16 µg/l,respectively, • ethylbenzene and xylenes were detected in all soil boring water samples at maximum concentrations of 3,100 µg/1 and 1,800 µg/l (B6), respectively Advanced GeoEnvironmental,Inc I