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Refuse fines will be recovered from the bottom of the thickener and pumped in a eight inch <br />inside diameter poly -pipe to one of the refuse return wells. This line will be laid on the <br />surface except in areas where it will be buried to avoid roads and other facilities. Exposed <br />portions of the pipe will be heat taped to prevent freezing. If maintenance work is required <br />on the pipeline, berms will be constructed to contain any spills or leakage. <br />The refuse slurry will consist of a about 34 percent solids by weight and water will be used <br />as the transport medium. The slurry will flow down through the return wells into the <br />abandoned workings and disperse. Return water will be recovered by a pump located north <br />of the preparation plant and piped to the plant for reuse. Slurry will be pumped at a <br />maximum rate of 700 gallons per minute with return water being pumped at the comparable <br />liquid percentage to allow for makeup water in the plant. The existing belt press system will <br />be retained in the preparation plant for additional backup in the event that the system is out <br />of service. <br />Areas to be backfilled will be sequenced from east to west (down dip to up dip). The refuse <br />return wells are located over an Allen Seam panel that has been pillared. Solid barrier <br />pillars will isolate new workings in the Allen Seam from the flooded fine refuse disposal <br />areas. The operation is not anticipated to change the existing condition of the mine and will <br />not have an effect on the surface area supported by the mine or surface effects following <br />backfilling. <br />The source of hydraulic transport medium for the slurry will be the makeup water pumped to <br />the prep plant which will be obtained from the existing mine pool in the underground <br />workings. Probing the clean water recycling hole (NEW -4) has indicated that approximately <br />50 feet of water is available in that area of the mine pool for return to the prep plant. Initial <br />makeup water will be the water already in the Prep Plant obtained from the Purgatoire River <br />from the Applicant's existing water rights. The method to be used to dewater the refuse fines <br />is to pump the water back to the Prep Plant from New -4. <br />Hydrologic impacts and monitoring are described under Section 2.05.6. <br />MR -104 2.05 -44b Revised 12/20/11 <br />