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UST Closure Report <br /> ABF Freight System,Inc. <br /> Manteca,California Page 6 <br /> • 4.3 Sampling Equipment Decontamination <br /> All sampling equipment and tools that came in contact with sample media were decontaminated <br /> by washing with water containing Alconox detergent, followed with a deionized water rinse, and <br /> second deionized water rinse. All rinsate water generated during the sampling equipment <br /> decontamination activities was disposed to the sanitary sewer. <br /> 5.0 RESULTS OF CHEMICAL ANALYSES <br /> 5.1 Soil <br /> The soil samples were analyzed for TPH-D (total petroleum hydrocarbons as diesel) and BTEX <br /> (benzene, toluene, ethylbenzene, and xylenes). All soil samples analyzed yielded non-detectable <br /> levels of BTEX. THP-D levels were found to range from <5.0 to 220 mg/kg. Copies of the <br /> analytical reports are presented in Appendix 3. Analytical results for soil samples collected from <br /> the excavation area are presented in the following table. <br /> Table 1 <br /> Soil Sample Analytical Results <br /> Sample Date TPH-D Benzene Toluene Ethylbenzene Xylenes <br /> Identification Sampled (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) <br /> Tl-NW-10'4" 3/20/98 <0.5 <0.005 <0.005 <0.005 <0.010 <br /> TI-SE-10'4"#2 3/20/98 <0.5 <0.005 <0.005 <0.005 <0.010 <br /> D14' 3/20/98 <0.5 <0.005 <0.005 <0.005 <0.010 <br /> SP1-S 3/20/98 220 <0.005 <0.005 <0.005 <0.010 <br /> SP 1-N 3/20/98 35 <0.005 <0.005 <0.005 <0.010 <br /> mg/kg milligrams per kilogram <br /> 5.2 Groundwater <br /> The groundwater samples were also analyzed for TPH-D and BTEX. One sample analyzed <br /> yielded non-detectable levels of BTEX. The other sample was found to contain from 2 to 27 <br /> µg/L of BTEX. THP-D levels were found to range from 41 to 53 mg/L in both samples. Copies <br /> of the analytical reports are presented in Appendix 3. Analytical results for groundwater samples <br /> collected from the excavation area are presented in the following table. <br /> Table 2 <br /> Groundwater Sample Analytical Results <br /> Sample Date TPH-D Benzene Toluene Ethylbenzene Xylenes <br /> Identification Sampled (mg/I) (µg2) (µg/L) (µg/1,) (µg/L) <br /> Excavation 11' 3/18/98 53 <2.5 <2.5 <2.5 <5.0 <br /> Pit Water 3/20/98 41 <2.5 2 2 27 <br /> \\SERVERI\C-DRIVE\PROIECTS\3272\Plans and Reports\UST Closure Rcport.doc <br /> May 21,1998 <br />