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1 <br /> Ultramar. <br /> Ultramar,Inc. Telecopy: 209-585-5685 Credit <br /> P.O.Box 466 209-583-3330 Administrative <br /> 525 W.Third Street 209-583-3302 Information Services <br /> Hanford,CA 93232-0466 209-583.3358 Accounting <br /> (209)582-0241 <br /> DATE REPORT SUBMITTED: June 26, 1998 <br /> QUARTER ENDING: "June 3 0,1998 <br /> SERVICE STATION NO.: 641 <br /> ADDRESS: 1210 East Hammer Lane,.Stockton, California' <br /> COUNTY: San Joaquin <br /> ULTRAMAR CONTACT. Joseph A. Aldridge TEL. NO: 209-583-3231 II <br /> BACKGROUND: <br /> A soil-gas survey and soil-vapor extraction performance test were performed in the UST <br /> backfill in June:1991 Petroleum hydrocarbons were detected in soil gas samples collected <br /> from the northwest portion of the tank pit. <br /> In June 1996, four 10,000 gallon USTs were removed arid.replaced with double-wall tank <br /> systems. Soil was excavated to a depth of-14 feet inthe"eastern portion.ofthe pit and" 18 feet <br /> in the western portion.. TPHg was detected'in a soil-sample collected from a depth of 19 feet <br /> at a concentration of 6;800 mg/kg. Impacted"soil in the vicinity of fuel dispensers and product <br /> lines were removed from the site. <br /> Two borings were advanced in July 1996 (B-1 and B-2). Coring B4 was converted into a <br /> soil vapor-extraction well:nest(VW-3 and VW4).' Boring B-2 was converted into,a well nest <br /> consisting of a monitoring well WI)and vapor'extraction wells(VW-1,and VW-2). In <br /> September 1997, Monitoring Wells MW-2 through MW-5, Sparge Well SW-1, and Vapor <br /> Extraction Well nests VE-5/VE-6 and VE-7/VE=8 were installed. It was determined that <br /> hydrocarbons were present in soil and shallow groundwater. <br /> II <br /> l <br /> BEACON <br /> A Member of the Ultramar Group of Companies #1 Quality and Service <br /> Ultramar" <br />