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MEMORANDUM CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD - CENTRAL VALLEY REGION 3443 Routier Road, Suite A Phone: (916) 361-5600 Sacramento, CA 95827-3098 ATSS Phone: 8-495-5600 TO: Wendy CohenNw`��' Senior Engineer FROM: Polly Lowry Associate Engineering Geologist DATE: 28 February 1992 SIGNATURE: SUBJECT: INSPECTION OF CHEVRON BANTA FUEL TERMINAL, TRACY, SAN JOAQUIN COUNTY On 29 January 1992 I met with Violet Cargill, Compliance Specialist for Chevron, to inspect the Banta Fuel Terminal at 22888 Kasson Road in Tracy. The inspection was in response to the requirements of the Aboveground Petroleum Storage Act (APSA), Section 25270.5(b) which states, "Each Regional Board shall conduct periodic inspec- tions of either each storage tank or a representative sampling of the storage tanks at each tank facility in accordance with the schedule determined by the board pursuant to subdivision (a) for compliance with the spill prevention and countermea- sure plan." Chevron U.S.A., Inc. stores and maintains petroleum products in 12 aboveground tanks. Finished petroleum products are piped into the aboveground tanks through the Bay Area Pipeline from Bethany. These products include unleaded regular gasoline, unleaded supreme gasoline, and diesel fuel No. 2 (see Table 1). Gasoline additives and heating fuel are off-loaded from trucks to three small (less than 1,000 gallons) storage tanks. All these products are loaded into tank trucks for distribution to retailers. All aboveground storage tanks are constructed of welded steel, none of which are cathodically protected. The two newest tanks, Tanks 8 and 9, each have a double bottom with an outer concrete shell and an inner steel plate. These two newer tanks sit on a high density polyethylene liner overlying compacted soil, with gravel surrounding the base of each tank. The older tanks all have a single-wall steel bottom which sits on a concrete pad with asphalt surrounding the tank. There was no evidence during the inspection of any leaks or spills around any of the tanks or tank pads. Water draw valves were locked on all tanks except for Tanks 3 and 22, which are out of service. There was no evidence during the inspection of any spills or leaks around any of the water draw valves. The containment area is divided into an upper and lower area (Figure 1). The tanks are all in the upper containment area, which has a capacity of 840,000 gallons. Although the capacity of the upper containment area is not large enough to contain the contents of the largest tank (2,100,000 gallons) it is graded so that drainage is generally from the upper to the lower containment area. The lower containment area has a capacity of 2,436,000 gallons. The eastern, northern, and southern berms of the lower containment area are covered with gunnite. The western berm, which separates the upper and lower containment areas, is covered with gravel and appears to be in good condition. Three inner berms divide the lower containment area into four sections. Each inner berm has a drain which connects one