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Unocal Service Station No 0187 <br /> September 21, 1994 <br /> The site was an operating Unocal Service Station from 1922 until 1992 The <br /> most recent service station consisted of a three-bay service station building, three <br /> product dispenser islands, and two gasoline and one waste oil tank in a common <br /> excavation (Plate 2) The site is currently an unpaved vacant lot <br /> PREVIOUS WORK <br /> Two 1 ,000-gallon gasoline and one 550-gallon waste oil USTs were removed <br /> from the southeast corner of the subject site in 1967 Data related to soil testing <br /> at the time of UST removal is not available <br /> Two gasoline and one waste-oil USTs and associated product piping were <br /> removed and the station building demolished during January, 1992 Petroleum <br /> hydrocarbons were not detected in soil samples from beneath the USTs. <br /> Petroleum hydrocarbons were detected in some soil samples collegted from the <br /> product piping trenches These trench areas were overexcavated,and confirming <br /> . soil samples collected Petroleum hydrocarbons were not detected in the <br /> confirming soil samples <br /> A second waste oil UST was removed from the eastern portion of the property <br /> in May, 1993 Petroleum hydrocarbons were not detected in the soil sample <br /> collected from beneath this UST Results of the UST removal investigation were <br /> reported in GSI Report No 782701-1, Tank Removal Observation Report, dated <br /> September 11 , 1992 <br /> In October, 1993, eight exploratory soil borings (U-A through U-H) were drilled <br /> in the locations of the former USTs, the former product dispenser islands, and a <br /> hydraulic lift in preparation for site closure During this investigation, Total <br /> Petroleum Hydrocarbons calculated as Gasoline (TPH-Gasoline) were detected in <br /> four soil samples obtained from borings U-C and U-D These borings were drilled <br /> up to 31 5 feet below ground surface (bgs) TPH-Gasoline concentrations ranged <br /> from 1 ,600 to 2,900 parts per million (ppm) Benzene was not detected in these <br /> samples Results of this subsurface investigation are presented in GSI Report No <br /> 782702-3, Exploratory Soil Boring Report, dated December 15, 1992 <br />• <br /> Report No 4827 703-5 2 <br /> GeoStrategies Inc. <br />