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B.Worst Case Discharge Analysis and Scenarios Version:27.10.4 B.3 RESPONSE CAPABILITY SCENARIOS The occurrence of a Small, Medium, or Worst Case Discharge could be the result of any number of scenarios at the Facility including: • Failure of manifold, mechanical loading arm, other transfer equipment, or hoses, as appropriate. . Tank overfill and/or failure. • Piping line, valve, or flange leak and/or rupture. . Tank truck and/or tank car loading overfill and/or failure. • Explosion or fire. • Equipment failure (e.g. pumping system failure, relief valve failure, or other general equipment relevant to operational activities associated with internal or external facility transfers). Events and conditions that pose a substantial threat of a Worst Case Discharge might include: . Tank and associated piping fire. • Catastrophic tank shell failure. . Natural disaster induced tank shell or major piping failure. A sudden release of tank contents due to the above potential threats could result in a breach of the tank basin secondary containment. Actions to prevent or mitigate a Worst Case Discharge due to the above potential threats include: . Periodic inspection of the tank to confirm integrity. • Periodic inspection of the tank basin secondary containment to confirm integrity. • Preventive maintenance as appropriate of the tank and associated piping. . Training of facility personnel on the proper procedures in event of a natural disaster to minimize the potential impact. Abnormal operations, which could result in a substantial threat of a worst case discharge, may include: . Unintended closure of valves. • Pressure differential exceeds or drops below the normal operating limits. • Loss of communications. . Operations of any safety device (i.e., relief valve or rupture disc). If any of these events occur, the affected system will be investigated, corrective action initiated, and the situation monitored by pipeline personnel. All corrective actions will be performed by qualified personnel appropriate to the task. The response actions to each of these scenarios are outlined in Section 3.0. The response resources, including details on equipment and manpower, are identified in Appendix A. Facility response personnel list/telephone numbers and other internal/external resources telephone numbers are detailed in Figures 2.1, 2.2 and 2.5. Shell Supply and Distribution B-6 Stockton Terminal FRP ©2019 Witt O' Brien's Revision Date:October, 2019