U.S. Geological Survey Manual Appendix A Part 445-2-H, Chapter 6 Risk Assessment Code (RAC) Matrix for the Risk Assessment System Risk Assessment Codes (RACs). RAC levels are identified by a numerical scale from 1 through 5, with RAC-1 representing the most critical hazard requiring immediate response and RAC-5 being the least critical. RACs are annotated by the RAC number, followed by the codes for probability and severity. Examples of RAC annotations are as follows: A notation of 1(A)(I) indicates a critical hazard that has catastrophic consequences and a poses an immediate danger. A notation of 4(IV)(B) indicates a low-level hazard of minor severity, but with a likely probability of occurrence. represents a hazard or deficiency with an immediate danger to life, health, or RAC-1 (Critical) infrastructure and requires either emergency correction or control of the hazard to a lower level of risk. RAC-2 (Serious) represents a hazard with a high level of threat to life, health, or infrastructure and requires either hazard correction or control of the hazard a lower level of risk as soon as possible. RAC-3 (Moderate) represents a hazard with a medium level risk to life, health, or infrastructure, with correction planned and completed or control of the hazard to a lower level of risk. RAC-4 (Minor) represents a hazard with a low level risk to life, health, or infrastructure, with correction planned and completed or control of the hazard to a lower level of risk. RAC-5 (Negligible) represents the lowest level risk and is considered minor. The correction of these risks can be planned in the out-years. Probability Code Frequent (A) Likely (B) Occasional (C) Rarely (D) Immediate Probably will Possible to occur Unlikely to danger to health occur in time if in time if not occur; ,may and safety of not corrected, or corrected. assume public, staff or probably will exposure will property and occur once or not occur. resources; more times occurs during the life of frequently or the system. Severity Code continuously. Catastrophic (I) Immediate and imminent danger of death or permanent disability, RAC RAC RAC RAC chronic or irreversible illness, or 1 1 2 3
U.S. Geological Survey Manual Appendix A Part 445-2-H, Chapter 6 Risk Assessment Code (RAC) Matrix for the Risk Assessment System Risk Assessment Codes (RACs). RAC levels are identified by a numerical scale from 1 through 5, with RAC-1 representing the most critical hazard requiring immediate response and RAC-5 being the least critical. RACs are annotated by the RAC number, followed by the codes for probability and severity. Examples of RAC annotations are as follows: A notation of 1(A)(I) indicates a critical hazard that has catastrophic consequences and a poses an immediate danger. A notation of 4(IV)(B) indicates a low-level hazard of minor severity, but with a likely probability of occurrence. RAC-1 (Critical) represents a hazard or deficiency with an immediate danger to life, health, or infrastructure and requires either emergency correction or control of the hazard to a lower level of risk. RAC-2 (Serious) represents a hazard with a high level of threat to life, health, or infrastructure and requires either hazard correction or control of the hazard a lower level of risk as soon as possible. RAC-3 (Moderate) represents a hazard with a medium level risk to life, health, or infrastructure, with correction planned and completed or control of the hazard to a lower level of risk. RAC-4 (Minor) represents a hazard with a low level risk to life, health, or infrastructure, with correction planned and completed or control of the hazard to a lower level of risk. RAC-5 (Negligible) represents the lowest level risk and is considered minor. The correction of these risks can be planned in the out-years. Probability Code Severity Code Frequent (A) Immediate danger to health and safety of public, staff or property and resources; occurs frequently or continuously. Likely (B) Probably will occur in time if not corrected, or probably will occur once or more times during the life of the system. Occasional (C) Possible to occur in time if not corrected. Rarely (D) Unlikely to occur; ,may assume exposure will not occur. Catastrophic (I) Immediate and imminent danger of death or permanent disability, chronic or irreversible illness, or RAC 1 RAC 1 RAC 2 RAC 3
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