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Cecchini Trucking Company Inc. SPCC Plan April 2020 Page 25 of 63 3.2 Rate of Spill and Worst -Case Scenario The worst-case spill rate scenario would be a catastrophic tank failure of the 12,000 -gallon diesel tank caused by a mechanical failure or external factor (i.e. impact from equipment, aircraft, or an earthquake that would crack open both walls of the double -walled tank). This would result in the release of 12,000 gallons of diesel fuel to the surrounding equipment yard area. The predicted direction of flow would be toward the center portion of the facility at the drain inlet. Refer to the drain inlet map in the appendix. The rate of flow would be commensurate with the amount of damage sustained by the 12,000 - gallon tank (i.e. how large the breach). 55 -gallon drums or containers sit squarely on top of their own spill pallet. The facility ensures that each 55 -gallon drum does not extend beyond the contained area of its respective pallet. If the side of the drum got punctured, then an attempt would be made to seal the puncture by any means necessary. After sealing the puncture, any seepage from the drum will flow down the side of the container into the spill pallet. Any spillage which may occur outside of the spill pallet will would be cleaned up promptly. Any 55 -gallon containers not installed in a covered area, will sit on their own spill pallet and be covered by tarps during the rainy season so that the containment area (within the spill pallet) is not displaced by any rainwater. Any spillage outside of these spill pallets will not leave the property. 3.3 Draining Secondary Containment Structures There is no secondary containment structure to be drained for the single 12,000 - gallon diesel tank. This tank is double -walled and self-contained. No secondary containment calculations are necessary for this site. 4.0 Potential Sources of Oil Spills 4.1 Bulk Storage Tanks The following table summarizes the single 12,000 -gallon diesel tank located at the facility's fueling area. Since, the tank is double walled, it is self-contained, therefore no additional containment is necessary. This double -walled tank has the following attributes: • Container is shop fabricated; • The tank is an Underwriter Laboratories (UL) -listed steel tank and meets UL -142 specifications. See the tank inspection sheet in the Appendix F.