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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 9 containment provides the volume of the container, the manufacturer's declared volume is used. When the volume of the secondary containment tank is not provided by the manufacturer, calculations for the volume are included in Appendix D. Single-wall containers that are not afforded the cover of a roof (i.e. stored outside) must also have additional derived secondary containment capacity or"sufficient freeboard" to be capable of storing any precipitation that may collect within its walls. Best management practice dictates that the size of the supplemental freeboard capacity must be sufficient to contain a 25-year, 24-hour storm of 2.6 inches'. The materials used to provide derived sized secondary containment at this facility are sufficiently impervious to contain any discharged material and sufficient capacity equal to or greater than 110 percent of the primary tank and collected precipitation. 2.4.2. GENERAL SECONDARY CONTAINMENT While engineered discharge prevention measures or approved engineered systems are required to address most spills/releases, the 2008 amendments to 40 CFR §112.7 modified the general secondary containment requirements under §112.7(c) by clarifying the scope of the general secondary containment requirements. General secondary containment includes diversionary structures (e.g. oil/water separators), equipment (e.g. drain covers, spill kits), or advanced training. For bulk containers and oil filled operational equipment, the method of general secondary containment chosen must be able to prevent the most-likely quantity of oil that would be discharged because of the typical failure mode, not otherwise addressed by engineered discharge prevention measures. Table 2 identifies Potential for Oil Discharges from Bulk Oil Containers the typical failure mode and most-likely quantity of oil that would be discharged. General secondary containment may be either active or passive in design, must be capable of containing oil, must be constructed so that the oil will not escape the containment system before cleanup occurs, and must include one or more of the following prevention systems or its equivalent: (i) Dikes, berms, or retaining walls sufficiently-impervious4 to contain oil; (ii) Curbing or drip pans; (iii) Sumps and collection systems; (iv) Culverting, gutters, or other drainage systems; (v) Weirs, booms, or other barriers; (vi) Spill diversion ponds; (vii) Retention ponds; or 3 Source: NOAA Atlas 14 Point Precipitation Frequency Estimates California 4 SPCC Guidance for Regional Inspectors clarifies that secondary containment structures such as dikes, berms, and retaining walls can be considered sufficiently impervious as long as they allow for cleanup to occur in time to prevent a discharge to navigable waters or adjoining shorelines, allows this determination to be made by a PE and documented in the SPCC Plan. =FTC Page 9