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' r Di Salvo Truck Lines-QEXWP June 21,1995 Page-2. grey, silty clay. Laboratory analyses of the floor sample indicated 190 mg/kg diesel was present in the a. soil. No other petroleum hydrocarbons were detected at or above the reported laboratory detection limits. 2.3 Tank Removal - TK2 a In July, 1988, one 10,000-gallon diesel UST (TK2) was removed from the site. The former location of TK2 is shown on Figure 2, Appendix A. TK2 was located adjacent to the former location of TK1. A SJCPHS,EHD representative was on site to select sampling locations and the required laboratory analyses. Kleinfelder was on site to collect soil samples and make field observations. One soil sample ` was collected from beneath each end of 1x2 at a depth of approximately 14 feet bgs. The soil samples L" were very moist, grey, sandy silt. Laboratory analyses detected 1,200 mg/kg diesel in the sample collected from beneath the north end of TK2 and 310 mg/kg diesel in the sample collected from beneath the south end. No other petroleum hydrocarbons were detected at or above the reported laboratory detection limits. ar 2.4 Site Investigation } In January, 1995, Condor installed 4 soil probes (SPI through SP4) to investigate the lateral and vertical extent of soil contamination and assess the groundwater conditions near the former Iocation of TK1 and TK2. The location of soil probes are shown in Figure 2, Appendix A. The native soil at the site La from approximately 10 inches bgs to at least 16 feet bgs consisted of generally dark gray to moderately yellowish brown, organic clay locally interbedded with very fine sand. The site is located approximately Lo 2,000 feet south of the San Joaquin River deep water channel in the Port of Stockton. Soil samples were collected from SPI at 5 and 12 feet bgs and from SP2, SP3 and SP4 at 6 and 12 feet bgs. Laboratory analyses of soil samples collected from SP2 detected toluene, ethyl benzene and V xylene at concentrations ranging from 150 µg/kg to 320 µg/kg and diesel at concentrations ranging from 1,600 mg/kg to 5,800 mg/kg. Diesel was detected in SP3 and SP4 at concentrations ranging from 5.8 mg/kg to 16 mg/kg. No evidence of hydrocarbon contamination was detected at or above the reported laboratory detection limits in the soil samples collected from SPI. Lo The rate of groundwater recharge into each soil probe was very slow. Groundwater samples were collected from SP1, SP2, and SPG. Groundwater did not effectively recharge into SP3. Laboratory LW analyses of groundwater samples collected from SP2 and SP4 detected BTEX constituents at concentrations ranging from ND to 5.0 µg/1 and diesel at concentrations ranging from 350 mg/l to 520 L. mg/l. A sheen was noted on the groundwater samples collected from SP2 and SPG. Diesel was detected L. n k « CONDOR 1+r