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Site Background Information AdvancedGeo AGE Project No. 13-2557 Environmental Page 2 of 4 "Ogg petroleum waste and was determined to be 75% full of liquids and semi-solids. At the request of the City of Tracy, the excavation was temporarily backfilled until a waste disposal company could be contracted. On 01 May 2014, the UST excavation was re-established and additional soil over the UST was removed and stockpiled. Advanced Chemical Transport (ACT) provided a heated pressure washer, vacuum truck and support services to evacuate the semi-solids from the UST and triple rinse the inside of the tank. A black, oil-like residue with sediment and possibly waste fuels was present at the lower portion of the UST. After rinsing, approximately 30 lbs. of dry ice were then applied to the UST. The lower explosive limit (LEL) and free oxygen was simultaneously measured to evaluate the risk of fire prior to UST handling and removal. The tank and associated piping were removed, transported and properly disposed of by West Coast Equipment of Turlock, California. One (1) soil sample was collected from the base of the UST excavation at 9 feet bsg and two (2) soil samples were collected and composited from the excavated stockpiled soil. The following is a summary of results: Total petroleum hydrocarbons as gasoline (TPH-g) were detected in both the excavation bottom (Tank#1-9ft) and stockpile sample (SP1&2) at concentrations of 35.2 milligrams per kilogram (mg/kg) and 42.3 mg/kg. Ethylbenzene was detected in the excavation bottom sample at a concentration 0.025 mg/kg, benzene was not detected in samples collected; total xylene was detected in the excavation bottom sample at a concentration 0.155 mg/kg. Ethylbenzene was detected in the stockpile sample at a concentration 0.410 mg/kg; benzene was not detected in samples collected; toluene was detected in the stockpile sample at a concentration 0.485 mg/kg; total xylene was detected in the stockpile sample at a concentration 2.489 mg/kg. Methyl tertiary butyl ether (MBTE) was detected in the excavation bottom sample at a concentration 7.23 mg/kg. MBTE was detected in the stockpile sample at a concentration 5.58 mg/kg. 1,2-dichlorobenzene and 1,2,4-trichlorobenzene were detected in the excavation bottom sample at concentrations of 0.365 mg/kg and 5.38 mg/kg, respectively; and 1,2,4-trichlorobenzene and 1,2,4-trimethylbenzene were detected in the stockpile sample at concentrations of 0.207 mg/kg and 2.43 mg/kg, respectively. Total lead was detected in the UST excavation bottom sample and soil stockpile sample at concentrations of 17.8 mg/kg and 244 mg/kg, respectively. No additional constituents of concern were detected during the UST removal. Analytical results of soil samples are summarized in Table 1.