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CARBON JUNCTION MINE (C-92-080) ANNUAL HYDROLOGIC REPORT WATER YEAR 2004 ~J I• The Oakridge Energy, Inc. Carbon Junction Mine (CDMG Permit No. C-92-080) is located approximately 2 'h miles southeast of Durango, Colorado. The mine is located on an area known as Ewing Mesa neaz the junction of Highways 160 and 550. The mine site is located in the upper drainage basin of Carbon Junction Canyon. Carbon Junction Canyon is an intermittent tributary of the Animas River. Much of the Carbon Junction Canyon drainage has a steep grade with a total drainage basin of 0.8 squaze miles. Hydrologic sampling and data collection has been conducted at the Carbon Junction Mine since 1982. The hydrologic sampling program is in place in order to protect water quality during the life of the mining and reclamation permit. The mine site was originally permitted by the Division of Minerals and Geology (CDMG), formerly Mined Land Reclamation Division, in 1983 and re-permitted in 1993. To date, coal mining activity has been initiated on the site on a minor scale. The extent of coal mining activities at the Carbon Junction Mine included opening both the North and South pits. Acillazy activity included construction of a permanently reclaimed spoils azea, sediment control structures, topsoil stockpiles, and pads for equipment. Permanent reclamation at the mine site was initiated in 1998 and included the final regrading of the permanently reclaimed spoils azea and initiation of reconstruction of the final configuration for Carbon Junction Canyon. In 2003, backfilling, grading, and topsoiling of the South Pit was completed. The South Pit and ancillary azeas were ceded to the Four Corners Materials Ewing Mesa #1 operation and incorporated into that CDMG construction materials mining and reclamation permit. This report includes hydrologic data for the 2004 water year (October 2003 through September 2004). Tables 1-5 present the summaries of water sampling data for springs and wells in the monitoring program. Figures in this report show trends from water year 1995 to water year 2004. With this data, trends in ground water and surface water maybe analyzed. Figures were not generated for chemical constituents that were analyzed consistently at or below the current detection level. Hydrologic data were collected for the Carbon Junction Mine from 1982 to 1995, except for the second, third, and fourth calendar quarters of 1988. These data and along-term analysis of ground water and surface water at the Carbon Junction Mine were presented in the ]995 Annual Hydrologic Report. Additional information is presented in subsequent annual hydrology reports in addition to this report. Locations of monitored springs and wells are found on the well and spring map within the permit document and Figure 1 in this report. In addition to the hydrologic monitoring undertaken for springs and groundwater wells at the mine, monitoring of dischazges from the sediment ponds aze undertaken. Sediment ponds aze also inspected on a quarterly basis for compliance with CDMG regulations. Carbon JUncuon Mine Page 1 Annual Hydrologic Reporcfor Waur Year 2004