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WESTERN SLOPE CARBON, INC. HAWK'S NEST MINE ANNUAL HYDROLOGIC REPORT 1984 INTRODUCTION This report is submitted in response to Stipulation 6 of Western Slope Carbon, Incorporated's Hawk's Nest Mine Permit C-016-81. No mining operations were conducted at either the East or West Mine in 1984. The ventilation system was shut down in 1983 and the portals secured. The in-mine hydrologic monitoring program was consequently discontinued during the cessation of operations due to the restricted access and reduced potential for hydrologic impact. On May 8, 1984, the CMLRD approved a reduced monitoring plan for aboveground facilities. Therefore, this report summarizes only that data required under the amended plan. The reduced monitoring plan requires monthly and quarterly data on the Norris Alluvial Well, quarterly data on the two remaining Crystal Meadows Wells (CM-2 and CM-3), and May-October field data collected for springs 8-11. In addition, the two biannual complete chemistry reports are due in May and October. SUMMARY OF DATA COLLECTED The attached tables 1-3 summarize the data collected during 1984. There are no discernible trends that would indicate progressively adverse impacts related to mining operations or ancillary facilities. Cessation of the mining operation in 1983 has further reduced the potential for hydrologic impact, although surface facilities at the mine and the Crystal Meadows disposal site could potentially contribute to localized water quality depreda- tion. However, the data analyzed from these sites has not identified any verifiable trends that would demonstrate this is happening. The required parameters were analyzed and data submitted to the Colorado Department of Health-Water-9uality Control Division pursuant to the requirements of the Colorado NPDES Discharge Permit for discharges from sediment ponds. Some TSS exceedences occurred during the second quarter due to high spring runoff. The state requested further information which was provided to their satisfaction. IMPACT MITIGATION Western Slope Carbon has an on-site all required lab samples, performs monl and performs any necessary maintenance diversion ditches, and slopes to ensure results from the presence of the mine maintenance program will continue for responsibility of the mine. inspector who collects and submits hly and quarterly field analyses, functions on the sediment ponds, that minimal environmental impact facilities. This monitoring and the duration of Western Slope'=_