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Step S: Assign PFM to Risk Matrix <br />Figure 18 shows a typical semi - qualitative risk matrix that is used as a graphical tool to <br />characterize risk based on the computed annualized probability of failure and descriptive <br />consequence level. This type of risk matrix was used to delineate approximate tolerable risk <br />guidelines for the various failure modes identified. Potential failure modes that plot in the <br />red - shaded cells would generally be above established risk guidelines, whereas those plotting in <br />the green- shaded cells would generally be below established risk guidelines. Those plotting in <br />the yellow- shaded cells are also generally above risk guidelines, but are not as urgent as those in <br />the red - shaded cells. Risk increases going diagonally from the yellow cells toward the upper <br />right hand corner of the matrix, and hence the urgency of addressing potential failure modes <br />plotting in those cells increases. Similarly, risks decrease moving diagonally from the yellow <br />cells toward the lower left hand corner of the matrix, and the need and urgency to address them <br />also decreases. However, risks plotting in the green- shaded cells should be kept under review <br />and properly managed. This may require continued monitoring and evaluation. <br />Figure 18 Semi - Quantitative Risk Matrix <br />San Luis Project Miller Geotechnical Consultants <br />Tailing Dam Data Report 40 February 2014 <br />