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• CARBON JUNCTION D'IINE (C-92-080) <br />ANNUAL HYDROLOGIC REPORT <br />WATER YEAR 2002 <br />The Oakridge Energy, Inc. Carbon Junction Mine (CDMG Permit No. C-92-080) is <br />located approximately 2 ih miles southeast of Durango, Colorado. The mine is located on <br />an azea known as Ewing Mesa near the junction of Highways 160 and 550. The mine site <br />is located in the upper drainage basin of Carbon Junction Canyon. Cazbon Junction <br />Canyon is an intermittent tributary of the Animas River. Much of the Carbon Junction <br />Canyon drainage has a steep grade with a total drainage basin of 0.8 squaze miles. <br />Hydrologic sampling and data collection has been conducted at the Carbon Junction Mine <br />since 1982. The hydrologic sampling program is in place in order to protect water quality <br />during the life of the mining and reclamation permit. The mine site was originally <br />permitted by the Division of Minerals and Geology (CDMG), formerly Mined Land <br />Reclamation Division, in 1983 and re-permitted in 1993. To date, coal mining activity has <br />been initiated on the site on a minor scale. The extent of coal mining at the Carbon <br />Junction Mine includes opening the north and south pits. Ancillary activity has included <br />construction of a permanently reclaimed spoils azea, sediment control structures, topsoil <br />stockpiles, and pads for equipment. Permanent reclamation at the mine site was initiated <br />in 1998 and included the final regrading of the permanently reclaimed spoils area and <br />• initiation of reconstruction of the final configuration for Carbon Junction Canyon. <br />Continued reclamation in 2002 included final construction of the permanent configuration <br />of the Carbon Junction Canyon drainage and backfilling at the North Pit. Aggregate <br />operations to the east of the South Pit have been expanded and will eventually include <br />areas of the South Pit. The South Pit reclamation will become the responsibility of the <br />aggregate operation. <br />This report includes hydrologic data for the 2002 water year (October 2001 through <br />September 2002). Tables 1-5 present the summaries of water sampling data for springs <br />and wells in the monitoring program. Figures in this report show trends from water year <br />1995 to water year 2002. With this data, trends in ground water and surface water may be <br />analyzed. Figures were not generated for chemical constituents that were analyzed <br />consistently at or below the current detection level. Hydrologic data were collected for <br />the Cazbon Junction Mine from 1982 to 1995, except for the second, third, and fourth <br />calendaz quarters of 1988. These data and along-term analysis of ground water and <br />surface water at the Carbon Junction Mine were presented in the 1995 Annual Hydrologic <br />Report. Additional information is presented in subsequent annual reports in addition to <br />this report. Locations of monitored springs and wells aze found on the well and spring <br />map within the permit document and Figure 1 in this report. <br />In addition to the hydrologic monitoring undertaken for springs and groundwater wells at <br />• the mine, monitoring of discharges from the sediment ponds are undertaken. Sediment <br />La~bon Junction Mine Page 1 <br />Annual Hydrobglc Raportinr Water Year 2002 <br />