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~= ~~ <br />_-_ ~t~tt <br />- - ~~. <br />_ - - A SuGsid0ry <br />_ °f <br />_ Werlern fueLt <br />Auoaatlmi, /nc <br />Mr. Dan Mathews <br />Division of Minerals & Geology <br />2148 &oadway, #C5 <br />Grand Junction, CO 81503 <br />iiiiiiiiiiiniiiiii <br />999 <br /> <br />:n <br />September 6, 1996 "':"`~~i.,,. <br />RE: MR 105. UNDERGROUND DISPOSAL OF PREP PLANT THICKENER WATER. <br />DESERADO MINE C-81-018. <br />Dear Mr. Mathews: <br />WFU hereby requests DMG's approval for underground disposal of the prep plant thickener water. <br />This water will be carried by a 6-inch pipe below the seal in the 6 East entry. See Permit Map 119. <br />The purpose of this revision is to utilize the mined-out azea of the mine to dispose of thickener fluids <br />normally processed in surface ponds. It will help reduce sediment build up and deaning of the ponds. <br />WFU plans to pump approximately 650,000 gallons per operating shift, 2 shifts per week, with a <br />maximum expected volume of 67.6 million gallons per year. The available storage volume of this area <br />is approximately 454 million gallons. Water production from mining fhe remaining 'D' Seam reserves <br />will be a maximum of 95 million gallons based on 45 g.p.m. for a period of 4 years. This would leave <br />an available storage wlume of 359 million gallons. At 67.6 million gallons per year it would take 5.3 <br />years to fill this area. This does not include the additOnal available area above 6th East of 768 million <br />gallons once mining is completed in 3-1/2 years to 4 years. Furthermore, the area below the East <br />Main sea! at crosscut 53 has an available storage area of 497 million gallons. These two additional <br />areas will increase the storage life 18.7 years for a total discharge free period of 24 years. <br />The gradient of the proposed storage area is 7 degrees to 10 degrees north easterly, the direction of <br />dip being away from mine openings. Underlying sUata consists of shale and siltstone. The water will <br />remain in the sealed azea with no surface discharge or effects to the hydrologic regime. If necessary, <br />a submersible pump could be re-installed at the SDH-2 location for dewatering. Discharge from this <br />location would meet NPDES Permit requirements. <br />40S Urban Street. Suite °305 <br />lakewmd, CO 808 <br />Telephone?213/)88--'X126 <br />Fax 103/9868147 <br />