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B.Worst Case Discharge Analysis and Scenarios Version:27.10.4 If the groundwater is near the surface, a possible solution might be a trench or an existing ditch. The back side of the trench or ditch could be lined with a polyethylene sheeting material which can serve to collect product for transfer to the oil/water separator. The groundwater would then be allowed to continue in its movement. If, however, the contaminated area is large and slow moving, an open trench may not be the answer. A deflecting barrier could be used as a structure which is more permanent than a trench or ditch and that moves the skimmed floating product to an upright recovery culvert with slits cut in the sides to allow the product to move inside and filter out the rocks. Deep groundwater recovery could be accomplished by using a cone of depression type of pumping method. By placing a well suction beneath the floating product and producing a funnel type of effect, the product could be brought to a general area. This cone of depression forms a greater area of product. The second pump shaft could then be placed in this region. Additional Comments This spill type is one that would result in a chain reaction of failures of other equipment (e.g., containment walls, tertiary holding ponds, control valves, etc.). The closest body of navigable water is San Joaquin River and is Northeast to Facility (see Section 6 ESMs). Appendix C, Section 6, and the ESMs in Section 6 describe and show locations of down gradient wells, waterways, drinking water intakes, fish, wildlife, and sensitive environments that are potentially impacted by any release offsite. Prevention For a worst-case discharge caused by a natural disaster, preparedness is more appropriate than prevention. The Facility employees receive training periodically on the proper procedures to deal with a natural disaster. Employees are also trained in steps to follow if the Facility must be evacuated (due to a tank fire or other emergency). In addition, prevention maintenance of tanks is performed at regularly scheduled intervals (to ensure that any weaknesses are discovered). Note that tanks can be expected, due to their shape and due to product weight, to fare very well during severe weather. Worst Case Discharge and Adverse Weather Calculation of response equipment needs for a worst-case discharge are given earlier in this Appendix. These calculations take into account adverse weather. Severe rain events and associated flooding would also increase the chances of an oil spill from leaving the property. Nevertheless, boom could be deployed as an initial measure to reduce the potential for any off-site drainage from a spill that may unfortunately occur concurrently with a severe rain event, and associated flooding. Shell Supply and Distribution B-16 Stockton Terminal FRP ©2019 Witt O' Brien's Revision Date:October, 2019