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Site Investigation History Barnes Trucking Facility 1817 South Fresno Avenue Stockton, California San Joaquin County Site Code No. 2506 Clearwater Project Number ZB 178 BACKGROUND The Barnes Trucking Facility is located adjacent to the southwestern comer of the intersection of State Highway 4 and South Fresno Avenue. The property is located approximately 1 .3 miles south of the Port of Stockton Turning Basin and 0. 75 miles northeast of the San Joaquin River. Currently, the site is used as a truck dispatch center and parking area. There are no fuel- dispensing facilities installed or operational at the site. 1992 - 1996 In letters dated September 18, 1992 and April 30, 1996, the San Joaquin County Public Heath Services Environmental Health Division indicated that additional investigation of this site was required because petroleum hydrocarbons were detected in soil samples collected from an underground storage tank (UST) excavation. According to an April 30, 1996 San Joaquin County Public Heath Services Environmental Health Division letter, two USTs were removed from the site on June 15 , 1992. Both USTs were 10,000-gallon capacity tanks that had been used to store diesel fuel. Four soil samples were collected from the bottom of the excavation at a depth of approximately 16 feet below ground surface (bgs) . Soil samples were analyzed for total petroleum hydrocarbons as gasoline (TPH-g), as diesel fuel (TPH-d), as kerosene (TPH-k), and as motor oil (TPH-mo) . Samples were also analyzed for benzene, toluene, ethylbenzene, and total xylenes (BTEX). The highest concentrations of TPH-g, TPH-d, and BTEX were detected at 5 ,700 milligrams per kilogram (mg/kg) TPH-g, 50 mg/kg TPH-d, and 48 mg/kg benzene. TPH-k and TPH-mo were not detected in any of the four samples. 1997 On September 25, 1997, Clearwater supervised the drilling of six soil borings to depths from 32 to 38 feet bgs. Three of the borings SB4 , SB-2 and SB-3 were converted to groundwater monitoring wells (MW- 1 through MW-3) . Soil samples collected from four of the six borings contained detectable concentrations of petroleum hydrocarbons. The highest concentrations of TPH-g (570 mg/kg) and benzene (4.0 mg/kg) were detected in the sample from SB-2 at a depth of 25 feet bgs . Groundwater samples collected September 29, 1997 from all three monitoring wells contained detectable concentrations of dissolved petroleum hydrocarbons. The highest concentrations of TPH-g (32,000 micrograms per liter [µg/L]) and benzene (2,200 gg/L) were detected in the sample from monitoring well MWA . Low concentrations of TPH-d were detected in soil samples from SB-5 ( 11 mg/kg) and SB-6 (2 mg/kg), and in the groundwater sample from MW- 1 (300 pg/L). Subsequent groundwater sample results have been non-detect for all three wells and with approval from the San Joaquin County Public Heath Services Environmental Health Division, analysis for TPH-d has been discontinued. Results of these efforts were presented in Clearwater's Subsurface Investigation Report, dated November 20, 1997, ZB 178 — Site Investigation History 1 Updated March 2010. Barnes Trucking. Facility — 1817 South Fresno Avenue, Stockton, California