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' i 1 0 INTRODUCTION This report summarizes the results of activities outlined in the site characterization workplan for the Carnation Company lease portion of property owned by Chevron, U S A , Inc located at _ 540 North Aurora Way in Stockton, California (Figure 1) This assessment was requested by the San Joaquin County Public Health Services Environmental Health Division (SJCPHS) because preliminary investigation at the site indicates the presence of petroleum hydrocarbons in soil 2 0 SITE BACKGROUND The site is located on the northeast corner of Fremont and Oak Streets in Stockton, California The site is currently owned by Chevron U S A Inc The southeastern portion of the site is leased to the Carnation Company which has operated a distributorship for Carnation diary food products for over 35 years The facility contained three underground product storage tanks which were used by the Carnation Company to provide fuel for six vehicles The facility dispensed leaded and diesel . fuels from two 3,500-gallon and one 4,000-gallon underground product storage tanks The product storage tanks were located in the northeast corner of the Carnation facility (Figure 2) No other maintenance activities were conducted onsite y 3.0 PREVIOUS INVESTIGATIONS In 1987, all three underground product storage tanks, dispenser, and product ,ines, were removed Backfill material within the former tank pit was excavated and removed Following storage tank removal, Canonte Environmental collected soil samples beneath each tank (Figure 2) Based on the results of the analyses conducted dunng the initial investigatior, the site was approved "closed" by the SJCPHS without further remedial activities Due to a recent change in regulatory requirements for Iead, the soils beneath two of the tanks potentially exceeded current regulatory levels of 13 mg/kg for organic lead and further investigation of soils was required by SJCPHS Cb. U.S A the 767 COMM