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3.5 Refuse Placement <br /> <br />After the initial site preparation, placement of refuse will <br />I <br />commence. The material will be placed in lifts not exceeding 24 ' <br />inches and each lift will be compacted to a minimum of 90% of ~ <br />maximum dry density (AASHTO-T99-74) as presented in "Technical <br />Revision to Permits-To-Mine, CMLRB C-007-80 and OSM CO-0021 <br />Mount Gunnison No. 1 Underground Mine, Refuse Disposal Area," <br />October 1984. <br />Additionally, since the daily volume of the refuse produced <br />will not warrant placement and compaction on a daily basis, it <br />will be necessary to accumulate the material in the placement <br />area for a period of approximately one week until adequate • ' <br />material is present to properly grade and compact the fill to <br />provide positive drainage. <br />The compacted surface will be sloped at two percent toward the <br />i <br />perimeter drainage channels and temporary collection channels. <br />Drawing No. MG-R-C-002 presents a plan layout for two bench <br />levels at elevation 6710 and 6760 feet. A typical cross- <br />i <br />section is shown on Drawing No. MG-R-C-003. As shown on the _, <br />typical cross-section, the back slope of a stage may be <br />temporarily constructed at 2H:1V to facilitate construction of <br />a temporary collection channel beyond stages at elevations 6710 <br />and 6760 feet. Once the refuse is ready to be <br /> <br />-11- <br />