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DEPARTMENT OF ROAD 8 BRIDGE <br />Ken Haynes • Road Superintendent <br />Central Maintenance Facility <br />467 E. Topaz • P.O. Box 9 • Granby, Colorado 80446 <br />Phone: 970 - 887 -2123 <br />Fax: 970 -887 -3168 <br />INERT FILL NOTICE (RULE 3.1.5(9)) <br />Benson Pit - M-1977-256 <br />From time to time over the life of the mine we may import <br />inert materials, as defined in Rule 1.1(20), into this mining <br />operation. It will be recycled or used to partially construct <br />the slopes that will be left when mining ends. Some may also be <br />used to backfill portions of the mined area. If courser fill is <br />used it will then be covered with finer material and revegetated <br />where required by the permit. If the material is good dirt we <br />will use it to supplement the topsoil needs for the mined area. <br />Sloping will not be delayed if fill is not available since the <br />fill will supplement material on the site at this time. <br />The exact amount of material to be imported is unknown. We <br />will record the volume imported each year and keep a running <br />total so if needed the Division will know how much and how it as <br />disposed of. Importing fill will take place from time to time <br />until reclamation is complete or we no longer have a source. <br />No specific compaction rates are proposed for the fill. The <br />material usually available contains smaller pieces of concrete, <br />or dirt mixed with the larger pieces of the same material. This <br />makes it very difficult to achieve a specific compaction rate. <br />While we take no action to reach a specific compaction rate, the <br />way the material is placed tends to compact it. We run heavy <br />equipment over the filled area during the filling process and the <br />material is compacted as a result. Stabilization of this fill <br />material is not a concern because of the limited amount used in <br />the slopes and the way it is placed. What voids do remain are <br />usually under large pieces of material and little settling is <br />possible. No structures will be built on the fill, nor will the <br />depth of the fill be so great as to affect offsite lands if <br />settling occurred. <br />