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City of Santa Ana, CAI SEWER RATE STUDY <br />g. Hydraulic Capacity <br />6. Identify key Consequence of Failure (CoF), also known as criticality criteria. These typically <br />include such direct or indirect factors as: <br />a. Effect on Customers (from size of pipe, number of services impacted, etc.) <br />b. Asset redundancy <br />c. Proximity to critical roads, water sources, environmental areas, etc. <br />d. Critical customers <br />e. Public Health & Safety <br />f. Financial impacts <br />7. Calculate overall Business Risk Exposure (BRE) for each asset. The BRE score is a product of the <br />PoF times the CoF scores. This score is an informative indicator of facilities that will likely require <br />higher levels of attention. It is typically based on a 1 to 100 scale metric. <br />8. Generate resulting tables, graphs and output maps to further identify trends and <br />recommendations. Typical facility replacement cost look -up tables are then used to determine <br />overall budgetary estimates and schedules. By plotting the PoF and CoF scores on the two axes <br />of a graph, the relative level of risk can be readily apparent. Figure B 1 below provides an <br />example risk heat map graph. Higher probability of failure assets are plotted near the top. <br />Higher consequences of failure assets are plotted to the right. Suggested possible action plans <br />appropriate to the levels of risk are also included in this chart. <br />9. As a final step in the CIP assessment, individual capital improvement projects can then be <br />identified. These projects area often based on the identification of high -risk assets and then <br />grouping those assets that are in close proximity. <br />The City's sewer collection system and water distribution system were evaluated using this process. <br />Since the overall focus of this study was to identify likely pipe replacement cost estimates for a <br />budgetary plan and schedule, many of these investigations were performed at a relatively high level. It is <br />recommended that the City review these results and refine the assessments as additional source data <br />becomes available. <br />[INTENTIONALLY LEFT BLANK] <br />BLACK & VEATCH I Appendix B: Sewer CIP Prioritization Process <br />65B -226 <br />