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Michael Cunningham <br /> M-1977-300; Preliminary Adequacy Review <br /> Page 3 <br /> the waste rock itself were considered as is the current general practice for slope <br /> stability. As such it does not appear any strength parameters of the waste rock <br /> itself are discussed. Please revisit the slope stability of the waste rock piles and <br /> consider potential circular failures that may extend through the waste rock, <br /> using the Division's factors of safety in Table 1. <br /> DRMS Table 1. Minimum Factors of Safety for Slop a Stability Analyses <br /> Type of Structure/Consequence Generalized,Assumed,or Single Strength Measurements <br /> of Failure Test Strength Measurements Resulting from Multiple Tests( ) <br /> Non-Critical Structures (e.g., 1.3 1.25 <br /> fences)/No imminent danger to (1.15)(2) (1.1)(2) <br /> human life,minor environmental <br /> impact,and minor repair costs if <br /> slope fails <br /> Critical Structures (e.g., 1.5 1.3 <br /> residences,utilities) /Potential (1.3)(2) (1.15)(z) <br /> human safety risk,major <br /> environmental impact,and <br /> major repair costs if slope fails <br /> (1) The number of tests required to provide a high degree of confidence in the strength parameters used <br /> depends on the variability of the material being tested and the extent of the highwall disturbance. <br /> (2) Numbers without parentheses apply for analyses using static conditions and those within <br /> parentheses apply to analyses using seismic acceleration conditions <br /> M-\Mm\TC1\_Uranium\M-1977-300 Schwa rtzwalder\MAC-Memorandum-Stab Wtr M-77-300-2016-07-27.docx <br />