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sL,. 0 INTRODUCTION/HISTORY Chevron U. S .A. , Incorporated (Chevron) , owns land at 540 N. ' i Aurora Way in Stockton, California. Three underground fuel, storage tanks and associated piping were removed from the ` site in 1987- Soil samples taken from under the fill end of the tanks were analyzed . Based on the results of the analyses, the site was approved "closed" without further remedial activities . Due to a recent change in regulatory requirements for lead, the soils remaining at the site exceed current regulatory levels for lead under two of the three tanks . As a result, further investigation of the site ks being required. to determine the extent of the contaminated soil and whether further remediation is necessary. The following report contains the background information and a soils contamination work plan proposal for the Aurora Way site as required by the San Joaquin County Public Health Services, Environmental Health Division . The underground fuel tanks proposed for investigation were utilized by Carnation Company at a warehouse complex located on property leased from Chevron. The property has been operated as a distributorship for Carnation dairy food products for over 35 years . During the last 21 years the site has been operated by Mr . Johnny Diamond . Mr . Diamond marketed Carnation Products with six trucks . The underground fuel storage system was used by Mr . Diamond for his trucks up until the time they were removed . According to Mr . Diamond the tanks were installed and utilized before he began operating at the site . Therefore the tanks were at the site for more than 20 years . ` The underground tanks included two gasoline and one diesel fuel storage vessels located under a concrete pad in the" northeast end of the Carnation lease . Piping from the fuel storage area carried fuel to the extreme north end of the Carnation lease where a below grade valve system switched from one fuel tank to another- before being released out of the dispensing pump nearby, The tank included two 3, 500 gallon tanks and one 4, 000 gallon tank . One of the 3, 500 gallon tanks and the 4, 000 gallon tank are the tanks that contained leaded gasoline and# the subJect of further investigation . The tanks were located fifty feet north of the Carnation warehouse and 1.85 feet north of Fremont Street . No septic tanks, private or municipal wells were known to be in the immediate vicinity. Utilities to the site included sewer and water and were delivered from Fremont Street . The adJacent Chevron Property includes three Chevron natural gas wells approximately 220 feet to the west of the site of the removed tanks . 1