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STATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866 -3567 <br />FAX: (303) 832 -8106 <br />COLORADO <br />p I V I S I O N O F <br />RECLAMATION <br />MINING <br />SAFETY <br />June 26, 2012 John W. Hickenlooper <br />Governor <br />Scott Wanstedt Mike King <br />Blue Mountain Energy, Inc Executive Director <br />3607 County Road 65 Loretta E. Pineda <br />Rangely, CO 81648 Director <br />Re: Deserado Mine (Permit No. C- 1981 -018) <br />Minor Revision No. 152 (MR -152) <br />Preliminary Adequacy Review Letter <br />Dear Mr. Wanstedt <br />The Division has received a copy of Minor Revision 152 — as -built design and certification for the B -Seam deNvatering <br />system. The Division has reviewed the submittal and has the following adequacy questions. <br />1. On proposed Map 157 the elevations for cross - section C -C' are in error. The vertical scale shown is in two <br />foot intervals, however, the scale labels jump from 5,600 feet to 5,606 feet in one interval. Please revise <br />the vertical elevation labels on cross - section C -C' and resubmit a certified copy of Map 157. <br />2. On proposed Map 157 the topography labels are missing on the Last Chance Pond and B -Seam dewatering <br />system plan views, making it appear that the emergency spillway at the Last Chance Pond is lower than the <br />primary spillway. Additionally, there is no detail on the emergency spillway for the Last Chance Pond. <br />Please revise Map 157 to include contour interval labels and please include a detail for the emergency <br />spillway. <br />3. On proposed Map 157 there are no details for B -Seam Dewatering Ponds 1, 2, 3, or 4. Table V -2 states that <br />these are included on Map 157. Please add details for B -Seam Dewatering Ponds 1, 2, 3, or 4 on Map 157. <br />4. On proposed Map 157 cross - sections A -A, B -B and C -C are included. Please indicate an A', B' and C' on the <br />plan views and the details to indicate the correct direction of the cross - sections on Map 157. <br />5. It appears that the crest length of the spillway at B -Seam Dewatering Pond 4 should be wider than the 6 <br />feet listed in the SEDCAD model inputs. Per the model output, a 6 -foot crest will not be long enough to <br />contain the 10 -year event, and certainly not long enough to contain the 25 -year event. Please review the <br />crest length of the spillway for B -Seam Dewatering Pond 4 and correct as necessary. <br />This concludes the Division's preliminary adequacy review letter for the Deserado Minor revision 152. The proposed <br />decision date is 9 July 2012. Your prompt response to the above adequacy questions will ensure the Division meeting <br />this date. If you have any questions, please contact me at (303) 866 -3567 X8145. <br />Sincerely, <br />James R. Stark <br />Environmental Protection Specialist <br />Office of Office of <br />Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines <br />