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B.Worst Case Discharge Analysis and Scenarios Version:27.10.4 Facility Piping: Most of the Facility's oil piping is above ground. Aboveground piping is easily accessed and regularly inspected. Leaks would be easy for employees to detect during normal facility operations and inspections. It is unlikely that a leak from piping would go undetected. Medium discharges from piping that contains oil are possible. Potential impacts from releases from exterior piping not inside secondary containment include impacts to soil, gravel driving or parking areas. Pumping Stations and Sumps: Oil transfer pumps are located in secondary containment areas or dikes. A medium discharge arising from the transfer pump operations would flow into the containment area. 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 medium discharge from the tanks would be contained within the 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 Medium Spill Scenario That Reaches a Waterway The most probable medium discharge would occur during normal operations: . Rainy, 86 degrees Fahrenheit, with winds out of the WNW at nine (9) mph. • During a seasonal thunderstorm, lightning strikes the Facility resulting in damage to tank 12. • Due to rain, Facility was currently draining Facility dike, which allowed approximately thirty-six thousand (36,000) gallons of Transmix spill into Facility's drainage system. Shell Supply and Distribution B-12 Stockton Terminal FRP ©2019 Witt O' Brien's Revision Date:October, 2019