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PN: 55743PE <br /> October 11, 1029 <br /> Page 5 <br /> testing or stability modeling. The analyses above are theoretical in nature since the waste rock <br /> has yet to be produced. The angle of internal friction utilized in our analyses are based on the <br /> results of experimental data for angular rock with a nominal maximum size of 12 inches as <br /> published in "Strength Characterization of Open-Graded Aggregates for Structural Backfills," <br /> 2015, FHWA—HRT-15-034. The substrate at the site is assumed to be a relatively thin soil <br /> mantle overlying competent formational material as discussed above. We make no warranty to <br /> these comments,either expressed or implied. <br /> Please contact us if you have any questions or desire additional information. <br /> Respectfully, <br /> TRAUTNER GEOTECH LLC <br /> 0 <br /> `fir <br /> ,7 anis — . <br /> i <br /> David L. Trautner, PE <br /> Principal Geotechnical Engineer <br /> TRAUTNER "111ii I IIT <br />