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LEARWATE ' • G R O U P, I N C 'f° f ik 1. Envzronmenta[ Services f�S 2 P 0 2 Ms Lon Duncan November 9, 1999 San Joaquin County Public Health Services/Environmental Health Division 304 East Weber Avenue,Third Floor Stockton,CA 95202 Re Workptan Addendum for Additional Subsurface Investigation Barnes Trucking Facility, 1817 South Fresno Ave, Stockton, CA A workplan dated September 30, 1999, was submitted by Clearwater Group, Inc (Clearwater) on behalf of Mr Floyd Barnes of Barnes Trucking, proposed additional subsurface investigation at the referenced property (Figure 1) for the purposes of contaminant plume delineation and identification of a possible off site source This workplan addendum is submitted in response to San Joaquin County Public Health Services Environmental Health Divisions (SJCPHS/EHD's) comment letter received November 3, 1999 This addendum workplan more adequately addresses concerns for both the County and the property owner The purpose of the work described in this workplan is to completely define the vertical and horizontal extent of soil and groundwater contamination located below the above referenced site and to investigate the possibility of an off-site source coming from the northeast or Fresno Avenue Background Site Description The Barnes Trucking Facility is located adjacent to the southwest corner of the intersection of Charter Way (State Highway 4) and South Fresno Avenue(Figure 1) The property is located approximately 1 5 miles south of the Port of Stockton Turning Basin and 0 9 mile east of the San Joaquin River (Figure 2) Currently, the site is used as a truck dispatch center and parking area There:are no fuel dispensing facilities operating at the site Previous Wor On June 15, 1992, two underground storage tanks (USTs) were removed from the site according to an April 30, 1996 letter by Ms Mary Meays of the SJCPHS/EHD At the tune of removal, both 10,000-gallon capacity USTs had been used to store diesel fuel According to the SJCPHS/EHD, 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 (TPHg) as diesel fuel (TPHd), as kerosene (TPHk), and as oil (TPHo) Samples were also analyzed for benzene, toluene, ethylbenzene, and xylenes (BTEX) The highest concentrations of TPHg, TPHd, and BTEX were detected at 5,700 mg/kg(TPHg),50 mg/kg(TPHd), and 48 mg/kg(benzene) TPHk and TPHo were not detected in any of the four samples above the laboratory reporting limit • In September 1997, Clearwater supervised the drilling of six exploratory soil borings (SB-1 through SB-6) to depths between 31 and 36 feet bgs in tate viarnty of the former USTs (Figure 2) Low to moderate concentrations of gasoline 520 Third Street,Suite 104 • Oakland,California 94607 • Telephone 510-893-5160 • Fax 510-893-5947