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Mr. Jerald Schnabel <br /> November 25, 2019 <br /> Page 2 <br /> 27. Material Strength Properties: The last paragraph on the first page of the Stantec Memo states <br /> the less than 3-foot lifts will be compacted by wetting the soil and traversing at least two passes <br /> with unspecified bulldozers or haul trucks. The DRMS requires material and compaction <br /> specifications for the fill material to ensure acceptable material is placed and compacted to an <br /> appropriate density. Please provide material and density specifications and discuss how it will <br /> be demonstrated the appropriate backfill density will be achieved using the proposed three- <br /> foot lifts. <br /> 28. Slope Stability Model: The first paragraph of Section 4 in the Stantec Memo references <br /> "closure configurations of the stockpiles". Please confirm the model analyzed the reclaimed <br /> highwall configuration and not just the stockpiles. <br /> 29. Granite Bench: The July 2012 Seegmiller International stability analyses in AM-03 provided <br /> an analysis of a 30-foot high granite bench(Appendix 11). No similar analysis was included in <br /> AM-04. Please confirm there is no change in the AM-03 granite bench highwall configuration <br /> to the AM-04 version, or provide a similar analysis. <br /> Please remember that the decision date for this application is December 19,2019. As previously <br /> mentioned if you are unable to provide satisfactory responses to any inadequacies prior to this date, <br /> it will be your responsibility to request an extension of time to allow for continued review of this <br /> application. If there are still unresolved issues when the decision date arrives and no extension has <br /> been requested,the application maybe denied. If you have any questions,please contact meat(303) <br /> 866-3567, ext. 8169. <br /> Sincerely, r <br /> Timothy A. Cazier, P.E. <br /> Environmental Protection Specialist <br /> ec: Michael Cunningham, DRMS <br /> DRMS file <br /> Paul Kos, Stantec <br /> C\Users\TC10ocuments Projects'—El Paso"M-77-211 Pikeview OUarry\AM-04 ReviseRecl\PAR-Geotech-2019-11-25_M-77- <br /> 211 docx <br />