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c~ ~ . STATE OF COLORADO Roy Romer, Governor DEPARTMENT OF NATURAL RESOURCES MINED LAND RECLAMATION DIVISION DAVID C. SHELTON, Director DATE: July 9, 1987 T0: Tom Gillis FROM: Steve Renner RE: DESERADO MINE ANNUAL HYDROLOGIC REPORT As requested, I have reviewed the Deserado Annual Hydrologic Report (AHR) submitted to the Division in compliance with the approved permit. The report summarizes the hydrologic data collected at the mine site during the period October 1, 1985 through September 30, 1986. The hydrologic data compiled during the collection period indicates that the mine is operating within the framework of the statement of probable hydrologic consequences contained in the permit document. During the review of the AHR, it became apparent that some of the data being collected is not pertinent to the current disturbances at the mining operation. Therefore, I suggest that Western Fuels, Utah submit a technical revision to discontinue monitoring at sites SW6-1, SW11-2, SW12-1, SW31-1 and SW33-1. Sites SW12-1 and SW11-2 have been inundated by the Taylor Draw Reservoir, and no longer provide useful information. Sites SW6-1, SW31-1 and SW33-1 are associated with Federal Coal Lease C-8424, and could be discontinued until a year before mining related disturbance within this lease area occurs. At that time, these sites should be reincorporated into the hydrologic monitoring program, using the current monitoring frequency. The Red Wash drainage is of interest as it is currently being undermined. WFU has an adequate monitoring program above the current mining area. Although it does not appear that Red Wash looses water to the mine after subsidence, further investigation above the second longwall panel is a prudent measure to adapt. It is recommended that, as the second longwall panel is developed, Red Wash site SW1-1 be moved so that it is located dust upstream of the northern panel entry. It is thought that the extent of activity under the Red Wash drainage warrants this change in the monitoring program. This change in location could be incorporated into the technical revision request outlined above. The relocated SW1-1 should be incorporated into the currently approved monitoring schedule. lal cc: Michael Savage 0937E 423 Centennial. Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (303) 866-3567