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0 9 <br /> 2.0 Site Health and Safety Information <br /> 2.9 Site Description <br /> SBC Pacific Bell plans to temporarily close the USTs located at various facilities pending <br /> planned future removal sometime next year. At Stockton, there is a 10,000-gallon UST <br /> containing gasoline for the fueling of Pacific Bell fleet vehicles that will be closed. At the other <br /> sites, similar size tanks used to store fuels also are being closed <br /> Prior to closure activities, Pacific Bell will arrange to have fuels within the tanks to be removed. <br /> Shaw will then arrange for the USTs and associated piping to be triple-rinsed by a certified <br /> hazardous waste subcontractor using a hot-pressure washer and detergent in order to remove any <br /> residual liquids, solids, or sludge. Following rinsing, the tanks will be visually inspected to <br /> ensure all liquids, solids, or sludge have been removed. The rinsate will then be transported off- <br /> site under a hazardous waste manifest. <br /> Following rinsing activities, the atmosphere of the tanks will be inerted using dry ice at a rate of <br /> approximately 20 pounds per 1,000-gallons capacity. After approximately 15 minutes, the lower <br /> explosive limits (LEL) and oxygen concentrations will be measured. Additional dry ice or water <br /> will be added to the tanks if the LEL is above 10% and oxygen level is greater than 10%. Once <br /> the LEL and oxygen concentrations are below target levels the tanks access ports will he sealed <br /> using locking caps. The power will then be disconnected from the fuel dispensers and locked <br /> out. The existing tank monitoring system will remain operational. <br /> Unusual Features: none <br /> 2.2 Site Background/History <br /> Waste Type(s) (Mark those that are applicable): <br /> soil Other(please specify):municipal trash may be <br /> encountered <br /> X petroleum liquids <br /> groundwater <br /> CNCB:ISHAREIUSn0 0068.doc <br /> 2-1 <br />