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Job: J. HELL - TRACY March 15, 1990 SITE HISTORY and PREVIOUS SITE WORK A bait and tackle shop now occupy the site. the current tenant also operates a rental truck business on the site. It was reported to TECO that an automotive fueling and repair station formerly occupied the site. It is the understanding of TECC that there are no known details regarding previous business activities on the site. It was reported to TECO that four underground fuel storage tanks formerly existed on the site. On July 18, 1989, TECC performed a reconnaissance of the subject ' i site. A concrete slab was observed in a parking area and just north of an existing building on the site. The current tenant of the site reportedly believes that underground storage tanks previously existed on the site in the approximate location of a currently concrete slab (see Plate 2). He indicated that the tanks had been removed from the site iii 1971. It is the understanding of TECO that there are no known details of the k.: tanks' removal, nor as-builts for the tanks and related plumbing. On December 6, 1989, TFCC removed a metal automotive waste oil tank from the site. The capacity of the tank was estimated to be approximately 250 gallons. The tank excavation and related soil sampling activities were ,performed in accordance with San Joaquin Local Health District tank removal and sampling guidelines (see Attachment 1, Tank Closure Data) . i The chemical analysis results of the soil samples collected from the tank excavation indicate detects le levels of Chromium, Lead, and zinc of 20, 18, and 46 parts per million (ppm) , respectively. The sample results also indicate detectable IOVe15 of Total Petroleum Hydrocarbons as Gasoline and 'Total oil and Grease of 390 ppm. It is the understanding of TECC that the amount of THE ENVIRONMENTAL CONSTRUCTION Co. ? ` f,