SITE INFORMATION AND CORRESPONDENCE 1988 - 2001

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EXECUTIVE SUMMARY Cherokee Truck Stop 3535 East Cherokee Road, Stockton, California The site is located in a commercial area of low topographic relief in the eastern portion of Stockton, California, adjacent to Highway 99 (Figure 1). The property is utilized as a truck fueling station. A truck repair facility is located north of the site. Six underground storage tanks are currently located adjacent to the fueling island at the site. Unauthorized releases of hydrocarbons were reported from fuel piping at the site on three occasions in 1988 and 1989. The PHS-EHD subsequently required investigation of the extent of impacted soil and ground water. In May 1990,thirteen soil borings were advanced near the USTs, piping and dispenser areas at the site to assess the lateral and vertical extent of impacted soil. Hydrocarbon odor was noted in soil samples collected in 12 of the 13 borings. Petroleum hydrocarbons were found to extend to a depth of approximately 50 feet below surface grade (bsg) near the fueling island location. Five ground water monitoring wells were installed at the site between 1990 and 1996, near the fueling island area. Petroleum hydrocarbons were detected in soil samples collected during the installation of ground water monitoring well UST-1 to a depth of 80 feet bsg. Low concentrations of benzene were detected during the installation of UST-4. Petroleum hydrocarbons were not detected in soil samples collected during the installation of UST-2 or UST-3. Ground water samples have been collected on 20 occasions between September 1990 and June 1997. Impacted ground water appears to be centered near UST-1. The well box for UST-1 was found to be in poor condition in 1993, and surface infiltration of water and fuel had occurred; floating product was encountered in UST-i. Ground water extraction from UST-1 was performed between July 1993 and August 1995 as interim remediation. Approximately 55 gallons of water and product were extracted every two weeks. Previous activities at the site were described in numerous quarterly reports prepared by Environmental Science & Engineering, Inc. (ESE)between June 1990 and February 1997. Most recent activities were summarized in Quarterly Reports for March and June 1997 prepared by Advanced GeoEnvironmental, Inc. (AGE). A Work Plan for the removal of six USTs was prepared by AGE and approved by the PHS-EHD. Operation of the fueling station is scheduled to cease by 31 August 1997. Removal of USTs and product piping is scheduled for early September 1997. Following UST removal activities, overexcavation of impacted soil is proposed in accordance with the attach Interim Remediation Work Plan. Advanced GeoEnvi ron mental,Inc.