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C T Preacquisition Environmental Site Assessment March 17, 1992 Anheuser-Busch, Arch Road, Stockton, California 9 6.3 Analytical Results The soil samples collected in the field were transported to GTEL Environmental Laboratories in Concord, California, under chain-of-custody protocol on February 27 and 28, 1992. The samples were composited by GTEL and portions of those composites were transported under chain-of- custody protocol to Enseco, Inc., Cal Lab Analytical in West Sacramento, California. The samples retained by GTEL were analyzed for metals, cyanide, herbicides, pesticides/PCB's, and sulfide. The samples sent to Enseco were analyzed for dioxin/furans, organophosphorus pesticides, semi-volatile organics, and volatile organics. All of the laboratory reports are presented in Appendix G. The laboratory reports for the soil samples indicated no detectable concentrations for cyanide, dioxin/furans, herbicides, organophosphorus pesticides, PCB's/pesticides, or sulfide. The Enseco laboratory reports indicated detectable concentrations of one volatile organic compound and one semivolatile organic compound. Acetone was the only volatile organic compound analyte detected in the soil samples. Acetone was detected in each of the three samples; 71 parts micrograms per kilogram (µg/kg) in the sample from soil boring SB-1, 100µg/kg in the sample from soil boring SB-2, and 35µg/kg in the sample from soil boring SB-3 (Table 3). Acetone was not detected in the method blank. Because acetone is a common laboratory solvent, the samples were composited a second time by GTEL and analyzed on March 13th and 14th for confirmation of the presence of acetone. The results of the second analysis were no detectable concentrations of acetone (Appendix G) indicating probable laboratory contamination or error. Bis (2-ethylhexyl) phthalate was the only semivolatile organic compound.analyte detected in the soil samples. Bis (2-ethylhexyl) phthalate was detected in each of the three composited samples; 840µg/kg in SB-1, 380µg/kg in SB-2, and 3400µg/kg in SB-3 (Table 3). Bis (2-ethylhexyl) phthalate was not detected in the method blank. As indicated on the laboratory reports, bis (2- ethylhexyl) phthalate is a common laboratory contaminant. _ V('GROUNDWATER _„TECHNOLOGY, INC.