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materials for backfilling may be obtained from the outslope of the access road to the Mine 1 <br /> Yard. The excavation area outslope shall not be steeper than 2H:1 V upon completion of <br /> excavation operations. <br /> The entry labeled "MCCCC" shall be backfilled to the bottom of the entry ceiling, so that the <br /> initials "MCCCC" remain visible after backfilling and grading operations are complete. Backfill <br /> height is estimated to be eight (8) feet, and fifteen (15) feet wide. The completed slope shall <br /> not exceed 2H:1 V. <br /> Debris and rubble currently exists north of the "MCCCC" entry for a distance of seventy-five <br /> (75) feet. The Rubble and debris shall be reworked as necessary to ensure that it does not <br /> exceed a height of six (6) feet as measured from ground surface immediately north of the <br /> debris. The rubble and debris must be covered by a minimum of four (4) feet of earthen <br /> material. The height of the backfill in this location shall be twelve (12) feet against the <br /> highwall, as measured from the ground slope immediately north of the fill area. The fill shall <br /> be compacted by sheep's foot roller every six (6) feet. Upon completion, the outslope of the <br /> fill shall not exceed 2H:1 V. <br /> Backfilling operations will not take place for a distance of about two hundred fifty (250) feet <br /> through an avalanche area. <br /> Backfilling will resume, and continue for an estimated slope length of 150 feet. Backfilling in <br /> this area will cover debris and rubble placed in this location during Task 2, Demolition. All <br /> rubble and debris must be covered by a minimum of four (4) feet of earthen materials. The <br /> height of the backfill shall be fourteen (14) feet as measured from the ground surface <br /> immediately east of the base of the fill. The fill shall be compacted by sheep's foot roller <br /> every six (6) feet. Upon completion, the outslope of the fill shall not exceed 2H:1 V. <br /> There will not be any backfilling for a distance of approximately four hundred (400) feet up <br /> the road from the end of the last backfill. For this four hundred (400) feet interval of road, <br /> grading of the road will occur to encourage water to flow off of the road surface as sheet <br /> flow. Existing berms on the outside of the road shall be eliminated. The bermed material shall <br /> be removed to the inside edge of the road. Material shall be placed preferentially, so that any <br /> existing ditches or depressions are filled first. The road shall be graded so that the slope of <br /> the road is to the outside, between 0.5% and 2%, rather than inside, portion of the road. <br /> Material removed during the grading operation shall be filled on the inside portion of the road <br /> at slopes not steeper than 3H:1 V, to facilitate drainage to the outside of the road. The <br /> remaining road remnant shall be ripped to a depth of eighteen 0 8) inches where soil depth <br /> allows. <br /> Beyond the four hundred (400) feet of road are the foundations of a fan and substation, which <br /> will be demolished and pushed against the adjacent highwall under Task 2, Demolition. This <br /> highwall will be backfilled to a height of fifteen (15) feet for an estimated distance of one <br /> hundred (100) feet. All debris and rubble shall be covered by a minimum of four (4) feet of <br /> earthen materials during this Task. The fill shall be compacted every six (6) feet by sheep's <br /> foot roller. Upon completion, the fill outslope shall not exceed 2H:1 V. Material for the backfill <br /> shall be obtained from the outslope of the road and bench adjacent to the fill area. Excavation <br /> shall proceed so that the final cut surface does not exceed 2H:1 V. Excavation shall proceed <br /> 14 <br />