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Simplot Grower Solutions—4863 Carpenter,Stockton CA Date: September 2019 -, SPILL PREVENTION CONTROL AND COUNTERMEASURE PLAN Page: 9 CHAPTER 4-SPILL PREVENTION AND CONTROL 4.1 Facility Drainage 4.1.1 Drainage from Diked Areas Diked areas at the facility exposed to precipitation include the chemical tank farm, tote storage area, and the gasoline tank.None of the diked areas at the facility are equipped with valves. Stormwater accumulated in dikes around the chemical tank farm and gasoline tank is emptied either daily or,in the case of a prolonged rain, at the end of stoim events. Stormwater from the chemical tank farm is pumped to the rinse water tank, transferred to totes, and given to farmers. Under normal operations, stormwater accumulated around the gasoline storage tank is pumped to the facility drainage system and stormwater in the tote storage area is allowed to evaporate. Any accumulated stormwater that is pumped to the facility drainage system will be inspected prior to discharge. Such events will be monitored under responsible supervision and recorded on the Stormwater Drainage Log provided in Attachment B. 4.1.2 Drainage from Undiked Areas The facility does not use its drainage system to meet secondary containment requirements; therefore, the provisions of§112.8 (b)(3)and(b)(4)are not applicable to the facility. The SPCC regulations in 40 CFR§ 112.8(b)(3)require facilities to prevent potential discharges from undiked areas by designing installation drainage systems to flow into catchment basins or lagoons or provide an equivalent level of control. Spills at the facility are most likely to occur during oil transfer to or from tanks, in which case facility personnel employ the use of active containment measures in responding to spills.Active containment measures are those that require deployment or other specific action by the operator, such as deployment of spill response materials. The only undiked areas with the potential for a spill are the loading/unloading areas for the crop oil tanks. In the event of a spill or leak during loading/unloading,pumps would be shut off by personnel monitoring the transfer and personnel would utilize spill response equipment to contain the spill. 4.1.3 Effluent Treatment System The facility does not operate an effluent treatment system. 4.2 Containment and Diversionary Structures Methods of secondary containment at the facility include a combination of active and passive secondary containment to prevent oil from leaving the property and entering navigable waters. Secondary containment is practicable at this facility. Secondary containment calculations are provided in Attachment C. 4.2.1 Chemical Tank Farm All oil storage tanks at this location have secondary containment sufficient to retain the volume ,� of the largest tank plus precipitation. The crop oil tanks are located within a concrete dike and