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t <br /> Geologicaf Technics Inc. <br /> 2601 KtRoad <br /> ,Ma6uw,Caftfomw 95353 <br /> (209)538-6414/jaX#538-5852 <br /> I <br /> Work Plan <br /> i Monitoring Well Installation & Groundwater Monitoring <br /> i <br /> C & B Equipment <br /> 7474 West 11th Street <br /> Tracy, California <br /> Project No. 336.2 <br /> June 15, 1995 <br /> ,I <br /> 1.0 SITE BACKGROUND <br /> i <br /> The C & B Equipment site at 7474 West 11th Street in Tracy was purchased from <br /> Holt Brothers in 1966. C & B Equipment operates the site as a repair facility, and <br /> conducts equipment and parts sales. <br /> On Jure 2, 1988, Jim Thorpe Oil, Inc. removed two UST's; one 550 gallon capacity <br /> diesel tank and one 1,000 gallon unleaded gasoline tank. The San Joaquin County <br /> Public Health Services Environmental Health Division (SJCPHS/EHD) inspector Mr. <br /> Jaime Favila reported that the diesel tank appeared intact but the soil around it was <br /> discolored and exhibited an odor. The gasoline tank was observed to have two one- <br /> half inch holes in it at the west end. Odors and discoloration were evident <br /> throughout the tank excavation. Groundwater was encountered at 8.5 feet and two <br /> soil and one groundwater samples were recovered from beneath the former tank <br /> I locations. <br /> I . Elevated concentrations of gasoline range and detectable concentrations of diesel <br /> range petroleum hydrocarbons were detected in the soil sample collected from the <br /> west end of the gasoline tank excavation. Approximately 16 cubic yards of soil were <br /> removed from the excavation. <br /> On March 15, 1994 the SJCPHS/EHD directed that C & B Equipment submit a work <br /> plan to further investigate the extent of contamination at this site. On June 12, 1995 <br /> Geological Technics Inc. was contracted to prepare the following work plan. <br />