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Spill Prevention Control and Countermeasure Plan Food Express, Inc. 1250 Madruga Road FOOD EXPRESS, INC. Lathrop, California 95330 May 2020 Page 8 2.4.1. ENGINEERED DISCHARGE PREVENTION MEASURES The SPCC rule requires the following areas of a regulated facility be outfitted with engineered secondary containment (also known as "approved engineered systems" in the California Fire Code (CFC) Section 5004). • Loading/unloading racks; • Production facility bulk storage; and • Bulk storage containers including mobile or portable containers2. Since this facility is not a production facility, it does not include any loading/unloading racks or very large bulk storage containers of the kind used in a production facility. The facility does however have smaller bulk storage containers that require engineered secondary containment. Engineered secondary containment for bulk oil containers must be sized to contain 110% of the contents of a sole container or 110%of the largest single storage container in the case of a shared common containment area that includes multiple tanks within its walls. At non-production facilities like this one (that contain smaller bulk containers), sized secondary containment is generally achieved by two different methods: Container type Type of sized secondary containment Single walled container Derived secondary containment (DSC) Double walled container Integral double wall container (IDWC) Table 1 identifies the containers used to store oil at the facility, whether they are integral double- wall (IDW)or single-wall in design, and the type and capacity of the DSC for the single-wall ASTs. The integral secondary containment system integrates the secondary containment in the design and construction of the bulk oil container. The most common integral sized secondary containment system is the IDW tank. IDW tanks start with a primary oil-containing tank contained within an outer containment tank that envelops the primary tank. Both tanks are constructed of materials compatible with and sufficiently impervious to contain the liquid they are constructed to store. The objective of the IDW tank design is that a failure of the primary tank would result in the oil being released into and contained within the space that exists between the primary and secondary tank, also known as the interstice. In general, these IDW tanks are not open to the atmosphere, preventing them from collecting any precipitation that may land on their exterior. Single wall ASTs were not designed with secondary containment at their time of manufacture. As such, single wall ASTs must have their secondary containment derived by being placed or contained within a constructed tank, berm, or structure sufficiently impervious (concrete, steel, plastic) to contain any discharged material and has sufficient capacity equal to or greater than 110 percent of the primary tank. When a single wall container depends on sized derived secondary containment, a description of the secondary containment tank, its volume, and the primary tank to which it provides secondary containment is included in Table 1. When the manufacturer of the sized derived secondary 2 does not apply to mobile refuelers or other non-transportation-related tank trucks =ATC Page 8