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• EF-'a: • CLEARWATER G R 0 L P I \ C • Enr IrDA ml nIII S,, [ 10 INTRODUCTION This document, prepared by Clearwater Group, Inc (Clearwater), presents a workplan for additional investigation of the Barnes Trucking Facility (Barnes Trucking), 1817 South Fresno Avenue in Stockton, California This workplan is submitted on behalf of Mr Floyd Barnes and Barnes Trucking In a letter dated August 20, 1998, the San Joaquin County Public Health Services, Environmental Health Division (EHD) indicated that additional investigation of this site is required because petroleum hydrocarbon contamination has not yet been delineated in the direction downgradient from the former underground fuel storage tanks 11 Site Description The Barnes Trucking Facility is on the southwest corner of the intersection of Charter Way (State Highway 4) and South Fresno Avenue (Figure 1) The property is located approximately 15 miles south of the Port of Stockton Turning Basun and 0 9 mile east of the San Joaquin River Currently, the site is used as a truck dispatch center and parking area There are no petroleum fuel storage or fuel dispensing facilities operating at the site 12 Previous Work According to an April 30, 1996 letter by Ms Mary Meays of the San Joaquin County EHD, 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 (Figure 2) On the basis of information provided by Mr Barnes, soil removed from the excavation was stockpiled, sampled, and returned to the excavation after the tanks had been removed According to the EHD, four soil samples were collected from the bottom of the excavation at a depth of approximately 16 feet below ground surface (bgs) The highest concentrations of total petroleum hydrocarbons as gasoline (TPHg) and of benzene, toluene,ethylbenzene and xylene isomers (BTEX) were detected in excavation sample #2/2S, that sample contained 5,700 milligrams per kilogram (mg/kg) TPHg and 48 mg/kg benzene TPH as kerosene (TPHk), as diesel (TPHd), and as motor oil (TPHmo) were not detected in sample #2/2S in concentrations exceeding the laboratory reporting limit A TPHd concentration of 50 mg/kg was detected in sample#1/1S Clearwater supervised installation of six soil borings (SB-1 through SB-6) to depths of 30 feet below ground surface (bgs) on September 25, 1997 The highest concentration of petroleum hydrocarbons detected in the soil borings was 570 dig/L of TPHg in SB-2 at 25 feet bgs No petroleum hydrocarbons were detected in borings SB-3 and SB-4 Soil boring soil sample analytical results are shown on Table 1 t Three of the borings were converted to 30-foot deep, 2-inch diameter groundwater monitoring wells (Figure 2) Historical groundwater monitoring results (three events) are shown on Table 2 The highest contaminant concentrations have been detected in MW-1, including 36,000 gg/L of TPHg and 4,100 gg/L of benzene,on September 29, 1998 C-178 WP 1 November 18,1998