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CLEARWATER • G R O U P, I N C Environmental 5erv:ces M 1 GROUNDWATER MONITORING REPORT f THIRD QUARTER 1998 Barnes Trucking Facility 1817 South Fresno Avenue, Stockton, California a r r November 6,1998 ca i a BACKGROUND 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 Basin and 0 9 mule 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 In letters dated September 18, 1992 and April 30, 1996, the San Joaquin County Public Health Services, Environmental Health Division (EHD) 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 EHD 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 (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 milligrams per kilogram (mg/kg) TPHg, 50 mg/kg TPHd, and 48 mg/kg benzene TPHk, and TPHo were not detected in any of the four samples On September 25, 1997, Clearwater Group, Inc (Clearwater) supervised the drilling of six soil borings to depths of from 32 to 38 feet bgs Three of the borings were converted to groundwater monitoring wells (MW- 1, MW-2, MW-3) Soil samples collected from four of the six borings contained detectable concentrations of petroleum hydrocarbons The highest concentrations of TPHg (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 TPHg at 32,000 micrograms per liter(lig/L) and benzene (2,200 µg/L) were detected in the sample from monitoring well MW-1 Low concentrations of TPHd 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 µg/L) After review of the Subsurface Investigation Report, dated November 20, 1997, the EHD requested two monitoring wells be installed to better define the areal extent of soil and groundwater contamination GROUNDWATER MONITORING AND SAMPLING ACTIVITIES(THIRD QUARTER 1998) Date of groundwater sampling 9/29/98 Wells gauged MW-1 through MW-3 Wells purged and sampled MW-1 through MW-3 Analytes tested TPHg and BTEX (Method 8015M/8020), five fuel oxygenates (Method 8240B) 10) Laboratory Entech Analytical Labs, (Sunnyvale, CA) 520 Third Street,Suite 104 o Oakland,California 94607 s Telephone 510-893-5160 o Far 510-893-5947