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5. 1 UNDERGROUND TANK LEAK <br /> This procedure is taken from the PGandE Underground Storage Tank Compliance <br /> Manual . For mCfre information on responding to underground tank leaks, refer to <br /> the Tank Compliance Manual . <br /> 1 . This procedure applies to cases where a tank leak has been confirmed <br /> either by: <br /> a. Failure of both an initial and follow-up full -system precision test . <br /> b. Three-month inventory loss of greater than 0.5 percent of product <br /> throughput and a failed precision test. <br /> 2 . put out all flames and other sources of ignition in the area of the tank. <br /> 3. If tests indicate the piping (rather than the tank) is leaking, lower the <br /> liquid level in the tank and take the pumps out of service. If the tank <br /> body is leaking, remove the contents of the tank ASAP with a tanker truck. <br /> If the product stored is gasoline, leave a 4- to 6-inch layer in the tank <br /> to assure a rich, non-explosive vapor mixture and to avoid contaminating <br /> the product with sludge. This will be removed before excavating the tank. <br /> 4. Notify the Evironmental Services Department at Extension 222-6946. For <br /> fuel tanks, also notify your Safety Engineering Representative. <br /> 5. Notify the local permitting agency and/or fire department by telephone of <br /> actions taken. Follow up with a letter within 5 days . <br /> 6 . Contact the Civil Engineering Unit, Department of Engineering Research to <br /> arrange for a preliminary subsurface investigation before proceeding with <br /> any closure or remediation activities. The results of the investigation <br /> will be used to determine what further action is needed. <br /> 7 . Repair piping or implement the tank closure procedure as appropriate. <br /> 8. If, after actions were taken to contain and cleanup the leak, it still <br /> poses a present or potential threat to the health and safety of people <br /> inside or outside the facility property, or to property or the <br /> environment, notify the State Office of Emergency Services (OES) and local <br /> emergency assistance organizations and provide the following information : <br /> a. Date, time, and exact location of the release or threatened release . <br /> b. Name and telephone number of person reporting the spill . <br /> 5-3a <br />