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B.Worst Case Discharge Analysis and Scenarios Version:27.10.4 Facility Piping: • Maintenance to facility piping could potentially cause a spill as per'Facility Maintenance' above. Piping can also rupture, leak or corrode. Any underground piping is cathodically protected and aboveground piping is inspected daily for leaks and drips. If product is released from piping, it could travel toward the north of the facility. • Response to spill caused by facility piping would include stopping the flow of product and using absorbent pads to absorb any product. Pumping Stations and Sumps: . Oil transfer pumps are located in secondary containment areas or dikes. A small discharge arising from the transfer pump operations would flow into containment areas. Containment areas are inspected for impacted storm water. If the storm water is found to be contaminated, it is disposed of according to applicable regulations or recycled back into the process. Leaks in piping can easily be isolated by valves up and downstream from the leaking section of piping. Potential spills associated with pumping stations or sumps will likely be small and detected quickly. Oil Storage Locations: . A small discharge from the tanks would be contained within their secondary containment systems and could easily be recovered by pumps, sorbents, and other recovery equipment. Vehicle Refueling Operations: . Vehicle fueling activities do not regularly occur at this site. Fueling of equipment used for maintenance is done in a prudent manner. Spills, dependent on location in Facility, would travel into the Facility's storm water system. Temporary portable equipment that requires fuel will be fueled carefully and with sufficient spill equipment and with the containment boom readily available. All equipment that is fueled on-site is inspected prior to operation to minimize the potential for leaks. Spills from fueling equipment could also potentially impact soil, gravel driving or parking. Age and Condition of Facility Components: . The Facility began operations in 1940, so age of equipment and tanks is of mild concern. To mitigate issues, Facility maintains a vigorous maintenance, repair, and/or replacement program to minimize age related incidents. Facility-Specific Small Spill Scenario That Reaches a Waterway The most probable small discharge could occur as result of an incident involving a tank truck: • Overcast, 70 degrees Fahrenheit, with winds out of the South at three (3) MPH. . A tank truck exiting the Facility swerves, causing the truck to overturn on the Facility Access Road. . Approximately two thousand and one hundred (2,100) gallons of diesel fuel spill onto the ground and begin to flow southwest towards Facility entrance gate. Shell Supply and Distribution B-8 Stockton Terminal FRP ©2019 Witt O' Brien's Revision Date:October, 2019