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C. Hazard Evaluation Version :27.10.4 CA ANALYSIS OF THE POTENTIAL FOR A SPILL The potential for a significant spill at the Facility is minimal due to the spill prevention measures that are in place and the operating procedures followed by Facility personnel. The probability of tank failure for single-wall storage tanks is 1.0 x 10-4 spill/tank-year (U.S. DOT, FEMA, and U.S. EPA Handbook of Chemical Hazard Analysis Procedures). For a spill of sufficient magnitude to escape the Facility is very remote due to the spill mitigation measures inherent in the Facility design. Spill prevention measures include a number of discharge detection methods and various inspection procedures described further in the SPCC Plan. All personnel responsible for Facility operations are qualified. New personnel receive on-the job training working with experienced operating personnel as well as training in the areas of safety, spill prevention, emergency response, and applicable pollution prevention laws, rules and regulations. They become qualified prior to assuming unsupervised operating responsibilities. Spill mitigation measures include facility designs intended to direct releases to containment areas where they can be promptly controlled and cleaned up. For a spill of significant magnitude to escape the Facility is very remote due to the spill mitigation measures inherent in the Facility design. Oil Spill History To-date the Facility has had one reportable spill. Table C-1 below will be used in the future to note any reportable spills that may occur at the Facility (Blank Spill Form located in Appendix F for reference). Tank Age Refer to the Hazard Identification Table located in this Appendix for the year of onstruction of each of the bulk storage containers at the Facility. Horizontal Range of a Spill Secondary containment dikes at the Facility will in most cases prevent the horizontal migration of a spill. Attenuations of any spilled material which might escape a diked area would be accomplished through the implementation of spill response activities by: (1) Facility personnel, or if necessary, (2)the spill response contractor listed in this Plan. The horizontal range of a spill, see Section 6, is 15 miles. Vulnerability to a Natural Disaster The Facility is located in a semi-active earthquake zone with occasional seismic activity. The Company has historical data that defines the probability of seismic activity in the Stockton, California area. The construction of the Facility has taken the possibility of some seismic activity into consideration; the location of tank farms away from slide prone areas, and constructing the Facility, including all subgrade soil preparation, along with slope and tank construction in accordance with appropriate building codes and industry guidelines. Shell Supply and Distribution C-10 Stockton Terminal FRP ©2019 Witt 0' Brien's Revision Date:October, 2019