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Cecchini Trucking Company Inc. SPCC Plan April 2020 Page 35 of 63 7.4 Secondary Containment Cecchini Trucking management has determined that secondary containment is practical for this facility. Secondary containment is achieved via double -walled containment and the use of spill pallets for smaller tanks and portable containers (55 -gallons and above). The 12,000 -gallon diesel tank (Table 4) that is installed at the truck fueling area is constructed of steel and is double -walled. The tank has enough shell capacity to hold its entire contents if the inner wall ruptured. Other attributes of the double -walled tank installed at the facility include: • Container is shop fabricated; • The inner tank is an Underwriter Laboratories listed steel tank; • The outer tank is constructed in accordance with nationally accepted industry standards (e.g. STI); • Equipped with the following overfill prevention measures to prevent overfills from tank: o All product transfers are constantly monitored The tank in the maintenance shop is a single walled steel tank. This tank is in a work area where employees always present and keep a vigilant eye on it throughout the day. If a puncture occurs, the employees will take immediate action and seal the hole. Any spillage will be cleaned up immediately. For larger spills Cecchini Trucking will contact the spill contractor to cleanup and remove the spilled material. There is no secondary containment for this tank, however the facility will consider obtaining a spill pallet for future use which will hold the entire contents of the tank if a puncture occurs. There are six 55 -gallon drums physically located in the facility's truck yard. Each drum has its own spill pallet and is kept covered up with a tarp to prevent rainwater and any dew concentrate from entering the containment area. These drums are constructed of steel and are visually checked regularly for leakage according to the STI Inspection Checklist in Appendix C.