COMPLIANCE INFO_1997-1998 - Laserfiche WebLink

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NOVEMBER 13, 1990 RE: UNOCAL SERVICE STATION #6015 601 E. KETTLEMAN LANE LODI, CALIFORNIA SITE SAFETY PLAN - GASOLINE TANK REMOVAL 1. For underground gasoline tanks, arrange for disposal of remaining liquid contents with authorized disposal service. 2. Drain and flush all piping into tank or appropriate container. 3. Remove all flammable liquid from the tank. Use a hand pump to remove the bottom few inches of liquid. 4. uncover tank and disconnect attached piping. 5. Prior to complete excavation and tank removal the tanks must be res -purged by the following method. Preferred method for conditioning tank: Make vapors inert by adding 15 lbs. of dry ice (carbon dioxide) per 1000 gal. of tank capacity. The vapors in the tank will be made inert by adding solid carbon dioxide (dry ice) in the amount of 15 lbs per 1000 gal. of tank capacity. The dry ice should be crushed and distributed evenly over the greatest possible area to secure rapid evaporation. As the dry ice vaporizes, flammable vapors will flow out of the tank and may surround the area. Hence, observe all normal safety precautions regarding flammable vapors. Make sure that all of the dry ice has vaporized. After the tank has been freed of vapors and verified to below 10% of the lower explosive level using calibrate gas detector, and prior to moving t\from the site, plug or cap all holes. Use threaded (boiler) plugs to plug any corrosion leak holes. One tank fitting plug should have a 1/81' vent hole to prevent the tank from being subjected to an excessive pressure differential caused by extreme temperature changes. 6. Temporarily plug all tank openings, complete excavation and remove the tank; placing it in a secure location. Block the tank to prevent movement. USE EXTREME CAUTION DURING REMOVAL OPERATION. 7. Remove tanks and secure at grade. 8. No fiberglass or steel tank shall be reused. Render all tanks useless after removing from site.