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5.I UNDERGROUND TANK LEAK <br />This procedure is taken from the PG&E Underground Storage Tank Compliance <br />Manual. For more 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 Environmental Services Department at Extension 222-6906. 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 (DES) 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 />c. The type of hazardous materials involved, if known, in the release or <br />threatened release. <br />F�I( <br />