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Calculations and Discussion • Dedicated Secondary Containment Capacity Calculations, • Active Containment Measures, • Additional Secondary Containment Capacity, and • Most Likely Quantity of Oil that would be Discharged. All bulk oil storage tanks and containers with a capacity of 55 gallons or more at the facility are equipped with either double-wall construction (and provides intrinsic secondary containment for 100+ percent of the tank capacity), or are located indoors on spill pallets. Since the secondary containment is not open to precipitation, this volume is sufficient to fully contain the product in the event of a leak from the primary container. The interstitial space between the primary and secondary containers is inspected on a monthly basis to detect any leak of product from the primary container. Fuel Tank Farm As discusses in the Plan,the two 10,000-gal diesel fuel tanks at the Tank Farm and Fuel Island Area are manifolded with a siphon bar. According to the SPCC Guidance for Regional Inspectors (December 16, 2013), Chapter 4: EPA inspectors should note that the "largest single compartment" may consist of several containers that are permanently manifolded together. Permanently manifolded tanks are tanks that are designed, installed, or operated in such a manner that the multiple containers function as a single storage unit (67 FR 47122, July 17, 2002).Accordingly,the total capacity of manifolded containers is the design capacity standard for the sized secondary containment provisions (plus freeboard in certain cases). Each of the two tanks is double-walled. If there is a release from the primary containment, it will flow into the interstitial space between the primary and secondary tank shells of the tank that has a leak. As the product flows into the secondary, the fuel level in the primary will fall until the fuel level in both the primary and secondary tanks is the same. For tanks manifolded together and operated as a single unit (as at Martin-Brower Stockton), a leak in a primary tank will cause the product to flow into the secondary as before. The fuel level in the leaking tank will drop, and the fuel in the other tank will also flow into the leaking tank. Once the fuel level is the same in all three tanks (primary tank with the leak, its secondary containment tank, and the intact primary tank),the flow will stop, and the entire possible volume that could be released is now contained by a single wall. Secondary Containment Calculations Page 1 of 5 Appendix L