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`I <br />AMERICAN <br />GYPSUM <br />September 28, 2017 <br />Division of Reclamation, Mining and Safety <br />1313 Sherman Street <br />Room 215 <br />Denver, Colorado 80203 <br />Attn: Travis Marshall <br />Please find enclosed a Request for Technical Revision (TR) Cover Sheet, eight plan and <br />profile sheets, and a check for the required fee. The TR includes an updated operations and <br />reclamation plan for the West (Lower) Pit at the Eagle -Gypsum Mine, CDRMS Permit M-1984-041, <br />in Eagle County. <br />The TR will allow an additional 100 vertical feet of gypsum ore to be recovered in the West <br />Pit and the original highwall and final pit to be backfilled to a 3:1 slope or flatter. No new surface <br />disturbance will be required to accommodate this TR. No update to the current SWMP plan will be <br />required and stormwater will continue to be contained within the West Pit. The proposed access <br />road will be constructed within the proposed reclamation area, designed for a perfect cut/fill balance <br />to final reclamation, and will be graded after the final pit is backfilled. Waste material from Upper <br />Pit operations will be hauled in to backfill the final West Pit. <br />Except those updates listed above, and in the attached plan and profile sheets, the Eagle - <br />Gypsum Mine will continue to follow the stipulations outlined in the original approval. <br />Yours very truly, <br />Jared D. ea <br />Mine Manager <br />American Gypsum Company 740 1 lighway 6 PO BOX 980 Gypsum. CO 81637 - Cell 970-306-5463 - Plant 970-524-8103 <br />