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DESERADO MINE <br />BLUE MOUNTAIN ENERGY <br />3607 County Rd. 65 <br />Rangely, CO 81648 <br />(970)675-4300 <br />fax (970)675-4399 <br />September 14, 2015 RECEIVED <br />SEP 17 2015 <br />Mr. Clayton Wein <br />Division of Reclamation, <br />Division of Reclamation, Miningand Safety Y Mining &Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: Minor Revision #166 — SDH -3 (D -Seam) Dewatering and Treatment System <br />Expansion. <br />Dear Clayton: <br />Enclosed is minor revision (MR -166) to construct two additional ponds for the D -Seam <br />Dewatering and Treatment System at SDH -3. The purpose of the additional storage is to <br />improve water treatment by increasing retention time. <br />The added material moved for these ponds will increase the volume of material moved during <br />reclamation. The material volume (subsoil) will increase by 1450 CY and the topsoil volume <br />will increase by 1100 CY. <br />SedCAD modeling was performed to account for the increased disturbance and contributing <br />watershed. <br />If you have any further questions please contact me at 970-675-4322. <br />Thanks. <br />Scott Wanstedt <br />Environmental Engineer <br />swanstedt@deserado.com <br />enc: <br />cc: Jeff Dubbert <br />Jennifer Maiolo — BLM <br />