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KLEINFELDER <br /> 1 EXECUTIVE SUMMARY <br /> - Guild Wineries and Distilleries, located in Lodi, C lifornia, removed a 500-gallon <br /> underground fuel tank in 1985. Subsequent investigations indicated that soil and ground <br /> water contamination was present around and under the excavated tank. Benzene, toluene, <br /> ethylbenzene, xylene, and total petroleum hydrocarbons were present in soil and ground <br /> water samples collected at the site. <br /> Upon completion of a Feasibility Study, it was concluded that given the site and <br /> contaminant conditions a vapor extraction system was the most appropriate, cost-effective <br /> solution. Guild contracted with Kleinfelder to design and install a vapor extraction <br /> remediation system to remove hydrocarbons from the vadose zone. The vapor extraction <br /> system was operated o.L a pilot scale basis and remained operational for testing,since it was <br /> -- one of the first operating systems in the State. This system operated for approximately 15 <br /> months, from March 1987 to June 1988. Emissions were monitored for the first several <br /> months and indicated that concentrations of removable hydrocarbons in the vadose zone <br /> were decreasing with time. <br /> After the first nine months of vapor extraction system operation, Guild contracted with <br /> Kleinfelder to assess the current status of hydrocarbon contamination in the vadose zone <br /> `¢ and ground water. Kleinfelder drilled one boring, B-17, in the area previous investigations <br /> ' indicated was highly contaminated. <br /> Prior to operation of the vapor extraction system, soil samples collected from a depth of 14 <br /> to 16 feet below ground surface contained total petroleum hydrocarbons at concentrations <br /> of 1,100 to 4,400 mg/kg,benzene at about 1 mg/kg, toluene at 5 to 11 mg/kg, and xylene at <br /> 34 to 67 mg/kg. Soil samples collected from B-17 at 5 foot intervals were qualitatively <br /> screened with a photoionization detector. Volatile organic compounds were not indicated <br /> from the field screening results. The sample collected at 15 feet b0ow ground surface was <br /> submitted for chemical analysis, and the laboratory reported no detectable concentrations <br /> of benzene, toluene, ethyl benzene, or xylene in the sample. A low concentration of total <br /> petroleum hydrocarbons,43 mg/kg,was detected in the sample. <br /> 113-88-908 l <br /> ��r <br />