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Tiger Lines, LLC SPCC Plan July 30,2019 Page 32 of 66 Table 6—Other Oil Containers Line Material of Maximum .0ty Total Secondary Item Construction Contents Containment Location Capacity Gallons Type 1 Steel Drum 55-gal. 4 220 Hydraulic Spill Pallet Maintenance Oil Shop Used Maintenance 2 Steel Drum 55-gal. 1 55 Hydraulic Spill Pallet Shop Oil 3 Steel Drum 55-gal. 3 165 Petroleum Spill Pallet East Fence Products Line 'Total Gallons 440 "The number of 55-gal. drums and amount (gallons)thatwere present on the day of Preparers site visit. Refer to the facility inventory log for a current count and amount (gallons). 4.3 Overfill Protection As allowed by 40CFR Part 112.7(a)(2), overfill protection may be achieved via an alternate method to achieve equivalent environmental protection. At Tiger Lines overfill protection is achieved procedurally (visually) and with electronic product inventory monitoring. During tank filling, the fuel delivery company prevents overfill by closely monitoring (visually) the tank filling process. The diesel tanks are checked to verify the available capacity and compared to the amount to be delivered. Each tank is equipped with a level indicator. The two 25K diesel tanks use a Veeder Root System to monitor the level in each tank. The tank, hoses and the fuel transfer are visually monitored during the entire process. Spill kits are readily available to clean up the "most likely" spill volume. For the large diesel tanks (Al and A2), the connections are located alongside the diesel tank. Refer to Appendix C for a detailed description of the equipment used during the fuel transfer process. Backflow, prevention valves are installed near the fueling port to stop fuel from leaking (Appendix C). Spill trays are used underneath the connection to the delivery truck. The loading ports have their own built in catch basin. Both have enough capacity to capture the most likely spill (approximately 11-gallons). Spill kits are readily available to clean up the "most likely" spill volume, which is minimal. To avoid overfilling while fueling, employees are instructed not to "top off' their vehicle and equipment fuel tanks and to be present at all times while fueling (or when transferring fuel to the 25K gallon diesel fuel tanks). The procedure described above is used when refilling or emptying the double-walled tanks in the maintenance shop.