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Simplot Grower Solutions—4863 Carpenter,Stockton CA Date: September 2019 <br /> SPILL PREVENTION CONTROL AND COUNTERMEASURE PLAN Page: 7 <br /> CHAPTER 3-EVALUATION OF DISCHARGE POTENTIAL <br /> 3.1 Description of Past Releases <br /> There have been no discharges of oil off site (or to navigable waters) from the facility in the past <br /> 3 years. <br /> 3.2 Distance to Navigable Waters and Flow Paths <br /> The Stockton facility is located on relatively level terrain with drainage generally flowing from <br /> east to west. The nearest navigable waterway is Duck Creek, about one-quarter mile to the north, <br /> however there is no direct flow path to navigable waters from the facility. The developed portion <br /> of the facility is equipped with storm drains that flow to the southwest corner of the facility, <br /> where a sump pump directs the water to a small grove of eucalyptus trees near the northern <br /> border of the facility. The undeveloped portion of the facility is graded such that stormwater is <br /> directed away from the facility boundary. <br /> 3.3 Potential Discharge Volumes and Direction of Flow <br /> Table 2 presents expected volume, discharge rate, general direction of flow in the event of <br /> equipment failure, and means of secondary containment for the facility's bulk oil storage <br /> containers. Figure 2 presents a facility diagram indicating the locations of these oil storage <br /> locations. <br /> Table 2—Potential Discharge Volumes and Direction of Flow <br /> Estimated <br /> Location Failure Scenario Volume Maximum Direction of Containment <br /> Released Discharge Rate Flow <br /> (gallons) <br /> Tank failure or leak 215-10,000 Gradual to Inside secondary Concrete dike <br /> instantaneous containment <br /> Chemical Inside secondary <br /> Tank Tank overfill 25 100 gal/min containment Concrete dike <br /> Farm <br /> Dispenser / iInside secondary Loading area <br /> hose/connection leaks 25 100 gal/min containment sump <br /> Tote Concrete <br /> Gradual to Inside secondary <br /> Storage Container failure or leak 275 instantaneous containment containment <br /> Area I I I structure <br /> gal/min=gallons per minute <br /> The following subsection describes the activities, equipment, and reasonable spill scenarios at <br /> the facility's oil storage areas. <br /> 3.3.1 Chemical Tank Farm <br /> The chemical tank farm is located on the west side of the facility. The tank farm consists of two <br /> concrete dikes, each containing six tanks,with a loading area in the middle. There are no oil <br /> products in the dike west of the loading area. Four tanks inside of the dike to the east of the <br /> loading area are designated to contain petroleum-based crop oil; however,Tank#8 was empty at <br /> the time of the site survey for this plan update. Finally, there is a small gasoline tank located <br /> directly east of the tank farm. This tank is outside of the concrete dikes and has its own <br /> containment structure. <br />