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DEPARTMENT OF ROAD & 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 3.1.6(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 />