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i <br /> Mr. Tom Juano <br /> Herrick Corporation <br /> March 15, 1993 <br /> Page 5 <br /> i <br /> ppm, Ethyl Benzene at .32 ppm, and Xylenes at 1.0 ppm. This sample <br /> i <br /> also contained petroleum hydrocarbons as diesel at a concentration <br /> of 190 ppm. Gasoline was not detected in this sample. <br /> Sample 03-E contained concentrations of hydrocarbons as diesel at <br /> 12,000 ppm and no detectable concentrations of BTEX or hydrocarbons <br /> as gasoline. <br /> Analysis of the soil stockpile samples indicated non-detectable <br /> ' concentrations of TPH-g and BTEX. Concentrations of TPh-d ranged <br /> between non-detect and 200 ppm. <br /> Soil Remediation <br /> A soil remediation work plan was prepared by DECON andisubmitted <br /> to San Joaquin County Public Health Services Environmental- Health <br /> Division. (Appendix D) . The plan proposed overexcavating at the <br /> two sample locations that reported high petroleum hydrocarbon <br /> " concentrations. With their approval, DECON remobilized and <br /> excavated approximately 60 cubic yards of soil from each location. <br /> Accompanied by a representative of SJCPHS, DECON re-sampled the two <br /> locations. Five samples were collected (from the bottom of the <br /> f <br /> excavation) in the excavator bucket. Eight discrete samples were <br /> collected from the new stockpiles. The soil samples were..anal zed <br /> P P Y <br /> for TPh-D and BTEX (Appendix E) . <br /> Analysis of Sample #3 reported no detectable concentrations of BTEX <br /> . '� and 18 ppm for TPH-d. These concentrations fall within permissible <br />