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MOUNTAIN CObL <br />~~`" ~ <br />COMPANYL.L.C. <br />A Subsidiary of Arch Wesmm Resources. LLC <br />June 18, 1999 <br />Mr. Jim Burnell <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: Minor Revision No. 261 (1999 Borehole Drilling); <br />West Elk Mine; Permit No. C-80-007 <br />Dear Jim: <br />iiiiiiiuiiiiiiiii <br />Wes[ Elk Ivtine <br />P O Box i91 <br />5174 Highway 133 <br />Somerset, CO 81434 <br />(970)929-SOIi <br />Fac (970) 929-i59i <br />RECEIVED <br />JUN 211999 <br />Division of Minerals 8 Geology <br />Mountain Coal Company, L.L.C. (MCC) submits the enclosed minor revision application to drill <br />fourteen (14) boreholes. Twelve (12) of the boreholes will be located in the vicinity of the main <br />mine facilities, and the other two (2) holes will be located in Sylvester Gulch. Of these <br />boreholes, 1 will be completed as a monitoring well, 6 will be completed as inclinometers, and 7 <br />will be completed as piezometers. Three of the inclinometers and three of the piezometers will <br />replace current installations that aze no longer functional. The remaining installations will <br />provide additional coverage for the site-wide geotechnical monitoring program. Borehole 99-01, <br />will become RPE-7, the additional monitoring well added to the ground water monitoring <br />program in Technical Revision No. 88. Please find enclosed a summary table of the holes to be <br />drilled, their depths, and how they will be completed. A map is also enclosed that shows the <br />location of these holes. The revision, upon approval, will be incorporated into Exhibit 12A, a <br />new exhibit entitled, Geotechnical Drilling Information. <br />All boreholes will be drilled in previously disturbed azeas. No topsoil stripping will be <br />necessary, and no temporary roads will be required to access the boreholes. The well, <br />piezometers, and inclinometers will have a protective casing to protect the hole from damage. <br />Soil sampling will be conducted on four of the boreholes, 99-03, 99-04, 99-10, and 99-1 l . Split <br />barrel soil sampling will be conducted every five feet, starting at five feet and ending at bedrock. <br />MCC expects most of the formations to be dry; however, there may be some shallow saturated <br />zones that may be encountered during drilling. Reclamation of the piezometers and <br />inclinometers will occur when the installation is no longer functional, or in the case of the <br />monitoring well, removed upon approval of the Division. MCC will adhere to Rule 4.07.3(1) or <br />(2), depending on conditions encountered, when sealing any boreholes. <br />MCC expects to begin this drilling project on June 28th. <br />Please call if you have any questions. <br />