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Initial refuse stockpile designs and associated stability analyses assumed <br />• mixing of coarse and fine refuse prior to placement and compaction. From a <br />practical operating standpoint, effective mixing prior to placement is <br />difficult and appears to have little beneficial effect on material compaction <br />and stability. Over a period of years successive modification of placement <br />practices reflecting site operating experience resulting in a "layered fill" <br />placement technique. Typically, a lift of fine refuse is placed and <br />compacted, followed by one or more lifts of coarse refuse. <br />The MLRD expressed concerns relative to any potential impact of layered <br />placement and variable percentages of coarse and fine refuse on refuse pile <br />stability. In order to address these concerns EFCI completed, submitted, and <br />obtained MLRD approval of a technical revision TR-14, Reevaluation of Coal <br />Refuse Pile Stability, in early 1992. This stability evaluation concluded <br />that layered placement and variable coarse/fine percentages would have no <br />adverse impact on stability and that original design parameters were overly <br />conservative resulting in understatement of the factor of safety. <br />• <br />• <br />C:ITM18601V OL.110P. PLN <br />10/08/9410:59emWP51/cmc 2.05.3.32Ra Revised - 10/07/94 <br />