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+� <br /> 10/L EGG ��� <br /> 4e? <br /> Castle Aggregate 9�F�Toti <br /> 549 East Cucharras,Street Colorado Springs,CO 80919 Ph:719-598-0215 Fax:719-598-3053 <br /> August 19, 2022 <br /> Colorado Division of Reclamation Mines and Safety <br /> Attn:Tim Cazier <br /> Room 215 <br /> 1313 Sherman Street <br /> Denver CO 80203 <br /> Re:Pikeview Quarry Permit No.M1977-211 Reclamation Completion Requirements <br /> Dear Tim: <br /> Dear Mr. Cazier <br /> Continental Materials Corporation (CIVIC)submitted to the Division of Reclamation, Mining, and Safety <br /> (DRMS)a request for a Technical Revision (TR-21)for the Pikeview Quarry. DRMS had two comments <br /> on the request; listed below are the comments and CMC's responses. <br /> 1) Material Density vs Slope Stability Model: Please elaborate on how the thicker proposed construction <br /> lifts might impact the material density used in the geotechnical slope stability model and the <br /> subsequent results. <br /> Response: The test area results demonstrate that the project compaction specifications will continue to <br /> be met using 24-inch-thick lifts. Meeting the compaction specifications also maintains compliance with <br /> the slope stability model inputs and subsequent results <br /> 2) 24-inch Maximum Rock Size: The current approved specification allows for a maximum rock size or <br /> 12 inches for the currently approved 12-inch lift thickness. The TR request an increase in the <br /> maximum allowed rock size to 24 inches. Is this increase in rock size representative of the test area <br /> constructed and tested on March 31 st and April 1 st? <br /> Response: The test area included limited rocks, but no 24-inch rocks were included. The lift placement <br /> process includes dumping the material, dozing to a flat surface, and then compacting to the specified lift <br /> thickness, and this material handling removes voids around any rocks present in the fill. The same <br /> process that allows compaction around 12-inch rocks in a 12-inch lift will also allow for compaction <br /> around a 24-inch rock in a 24-inch lift. Following compaction and testing, the lifts are then trafficked by <br /> haul trucks placing the next lift, and no soft spots, pumping, heaving or other signs of voids(i.e., informal <br /> monitoring) have been observed during the hauling activities placed to date. The onsite staff will continue <br /> to monitor the compacted fill formally and informally for any signs of voids. <br />