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U-Haul Facility Number 7Z59-2-3 California HEALTH AND SAFETY FLAN Page 7 • Any hazardous waste removed from the site must be transported under manifest by a registered transporter subject to all applicable governmental regulations. • A minimum of 20 pounds of crushed dry ice per 1,000 gallons of capacity will be placed into the tank. Cap fill pipe and dissipate the vapors through the vent pipe for a minimum of two hours. • Remove surface asphalt or concrete and dispose off-site. • Excavate soils below paving in lifts as directed by U-Haul and the County oversight agency. • If at anytime during the excavation, the lower explosive limit of the atmosphere around the tank exceeds 10 percent, all work will cease and proper mitigation procedures will be instituted. • Remove all associated piping, dispensers, etc. from tank and dispose off-site, inspect for any possible leaks. • No cutting torch, open flame, or spark producing equipment shall be used on the tanks or piping at any time. • Air purging of the tank shall begin whenever the tank's atmosphere is found to be above 10 percent of the lower explosive limit (LEL) and shall continue until the readings are at or below 5 percent of the LEL or 700 ppm or as directed by the local agencies. • A pneumatic cold cutting tool shall be used to cut a manway to observe the complete interior of the tank. The minimum size hole shall be 24 inches by 24 inches. • Triple rinse inside of the tank with high pressure water. Loose scale, sludge, and rinse water shall be removed by the vacuum truck. Continuous air purging may be necessary to maintain 5 percent of the LEL within the tank. • When all rinse water and debris have been removed from the tank, and the lower explosive limit reading is 0%, the washing may cease. • Finish excavation of soil around tank and remove tank by lifting only. Tanks shall be removed intact. Inspect tank for signs of leakage. • Secure tank to appropriate transport vehicle with its openings at the top. Tanks will be removed from the job site as soon as feasible.