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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 />October 13, 2015 <br />Mr. Clayton Wein <br />Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RECEIVED <br />OCT 19 2015 <br />DIVISION OF RECLAMATION <br />MINING & SAFETY <br />RE: Minor Revision #166 — SDH -3 (D -Seam) Dewatering and Treatment System Expansion — <br />response to comments. <br />Dear Clayton: <br />Enclosed are the revised pages for MR -166. Our response to your comments areas follows: <br />1. The elevations and contour intervals have been added to the maps per your request. <br />2. A "title" was added to the single cross section with a cross section position on Map 140. <br />3. North arrows were added to the maps per your request. In any of BME's maps without north <br />arrows it can be assumed that up is north. <br />4. A text description describing the SedCAD model is included per your request. If you need <br />additional help interpreting the model please give me a call. <br />5. Structure #5 is the upper pond receiving the least runoff and the least flow. Structure #1 is the <br />lowest pond and flow is controlled through the pipe primary spillway, unlike the other two ponds <br />which are open channels. This pipe restricts flows and creates more lag in the model. The <br />significantly higher inflows to Structure #1 is also greatly influenced by SWS #4 requiring greater <br />inflows to generate the simulated 350 gpm of mine water discharge through the pipe. <br />6. I cannot explain the discrepancy but can tell you the proposed Map 140 elevations for the existing <br />structure and design area were surveyed this year buy a certified public land surveyor who is also <br />the P.E. who did the design and stamped the drawings. I wouldn't get too bent out of shape over <br />the discrepancy in elevations since the relative elevations appear reasonably accurate for the <br />purpose of the design and what is currently proposed is bases off of a current survey. <br />If you have any further questions please contact me at 970-675-4322. <br />Sincerely, <br />Scott Wanstedt <br />Environmental Engineer <br />swanstedt u.deserado.com <br />enc: <br />cc: Jeff Dubbert <br />