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4 <br /> <br />• Gravity compaction of the horizontal lifts as they are <br />built could constitute "concurrently compacted." [Rule <br />4.09.2(3)] <br />• The design and stability analysis is to be supplemented <br />by a construction plan setting out the methodology to <br />prevent voids and to achieve densities to ensure mass <br />stability so as to demonstrate compliance with Rule <br />4.09.2(3)(a,b,c,d). <br />• The proposed underdrain must be extended to the head of <br />the fills to meet the requirements of a subdrainage <br />system. [Rule 4.09.2(2)] <br />OSM was asked by Colorado MLRD to provide technical support to <br />MLRD in evaluating the excess spoil valley fill proposal. OSM <br />agreed to respond in the near future to that request. <br />~~ <br />a and L. Lowrie <br />Attachment <br />cc: Bernard Freeman, AFO <br />Jim Pendleton, CO, MLRD <br />Rich Atkinson, Colowyo Coal Company <br />