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i <br /> I' <br /> I <br /> INTERIM WORK PLAN <br /> Babka Distributing <br /> 1149 West Weber Street <br /> Stockton, CA <br /> i <br /> 1.0 INTRODUCTION <br /> i <br /> Geological Audit Services, Inc. (GeoAudit) has been retained by Mr. John Urrutia of the <br /> Bank of Stockton to drill two soil borings at the property located at 1149 West Weber Street <br /> in Stockton, California. The location of the site is illustrated in Figure 1. A plan of the site <br /> is illustrated in Figure 2., <br /> 2.0 BACKGROUND <br /> Located in a flat industrial area in the Port of Stockton, the property was the site of Babka <br /> Distributing, a beer distributorship, until 1.989 and was vacant from 1989 to 1992. The <br /> property is currently used by the World Wildlife Museum for storage. One 10,000-gallon <br /> gasoline tank and one 3,000-gallon diesel tank were installed at!,the site in 1972. The tanks <br /> were used to fuel delivery trucks. Both underground storage tanks were removed from the <br /> site by Jim Thorpe Oil Company in April 1991. Diesel and g iasoline contamination were <br /> detected in soil samples collected beneath the tanks. The Bank of Stockton was directed by <br /> San Joaquin County Public Health Services - Environmental Health Division (PHS/EHD) <br /> to perform an assessment of the lateral and vertical extent of the contamination. <br /> Falcon Energy Associates, Inc. was retained to excavate the contaminated soil, and <br /> GeoAudit was contracted to supervise the excavation and collect soil samples. Excavation <br /> was performed in January 1992, and covered ail area of approximately 55 feet by 17 feet <br /> and extended to a depth of 14 feet. Groundwater entered the excavation during soil <br /> removal, and stabilized at a depth of approximately 12 feet. Soil samples were collected on <br /> February 3, 1992 from the sidewalls of the excavation, confirming the successful removal of <br /> contaminated soil. However, contamination was detected in a water sample collected from <br /> the excavation. jl <br /> i. <br /> Monitoring wells were installed in May 1992, and groundwate I samples were collected in <br /> June, September, December 1992 and March and September 1993. Concentrations of <br /> dissolved hydrocarbons have declined over this period. No hydrocarbons were detected in <br /> the December 1992, March or September 1993 samplings Contamination was detected in <br /> soil samples collected during the installation of monitoring wells MW-2 and MW-3. <br /> II <br /> &bbw'PG1-941.2E <br /> i <br /> r.. -..� ... ...� . it <br />