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INTRODUCTION/HISTORY <br /> Chevron U.S.A , Incorporated (Chevron) , owns property ate- 540 <br /> N. Aurora Way in Stockton, California. Three underground-, <br /> fuel storage tanks and associated piping were removed from <br /> d <br /> the site in 1987. Soil samples taken from under the fill <br /> end of the tanks were analyzed. Based on the results of the <br /> analyses, the site was approved "closed" without further <br /> � a.�''D remedial activities Due to a recent change an regulatory <br /> requirements for lead, the soils remaining at the site <br /> `exceeded current regulatory levels for lead under two of the <br /> thee` tanks. As a result, further investigation of the site <br /> was r4qujred to determine the extent of the contaminated <br /> ' soil and whAtlmr,further remediation is necessary A soil <br /> contamination workp a re art for the as <br /> peg required by the San Joaquin County Public Health Services, <br /> Environmental Health Division, was submitted on October 9, <br /> 1989, This problem assessment report summarizes the results <br /> of the investigation outlined in the workplan and presents <br /> cc,nclusi.ons and recommendations based on its findings <br /> The underground fuel tanks proposed for investigation were <br /> utilized by Carnation Company at a warehouse complex located <br /> � . on property leased from Chevron. The property has been <br /> operated as a distr-butorship for Carnation dairy food <br /> products for over 35 years. During the last 21 years the <br /> site has been operated by Mr. Johnny Diamond. Mr. Diamond <br /> marketed Carnation Products with six trucks. The <br /> -F underground fuel storage system was used by Mr. Diamond <br /> ts, r .f Solely for fueling his trucks up until the time they were <br /> removed. No other maintenance activities were conducted on- <br /> sate. According to Mr. Diamond the tanks were installed and <br /> utilized before: he began operating at the site. Therefore <br /> rry the tanks were at the site for more than 20 years. <br /> = The underground tanks included two gasoline and one diesel <br /> fuel storage vessels located under a concrete pad in the <br /> r northeast end of the Carnation lease. Piping from the fuel <br /> storage area carried fuel to the extreme north end of the <br /> Carnation lease where a below grade valve system switched <br /> from one fuel tank to another before being released out of <br /> the dispensing pump nearby. <br /> .� The tank included two 3, 500 gallon tanks and one 4,000 <br /> gallon tank. One of the 3, 500 gallon tanks and the 4,000 <br /> gallon tank are the tanks that contained leaded gasoline and <br /> the subject of further investigation. The tanks were <br /> located fifty feet north of the Carnation warehouse and 185 <br /> feet north of Tremont Street. No se tic tanks, private or <br /> mun_ xcipal. wQ is were known to be in the imme ate vicinity <br /> I <br />