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CARBON JUNCTION MINE (C-92-080) ANNUAL HYDROLOGIC REPORT WATER YEAR 2002 The Oakridge Energy, Inc. Cazbon Junction Mine (CDMG Permit No. C-92-080) is located approximately 2 '/z miles southeast of Durango, Colorado. The mine is located on an azea known as Ewing Mesa neaz the junction of Highways 160 and 550. The mine site is located in the upper drainage basin of Cazbon 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 Cazbon 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 at the Cazbon Junction Mine includes opening the north and south pits. Ancillary activity has 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 Cazbon Junction Canyon. Continued reclamation in 2002 included final construction of the permanent configuration of the Carbon Junction Canyon drainage and backfilling at the North Pit. Aggregate operations to the east of the South Pit have been expanded and will eventually include azeas of the South Pit. The South Pit reclamation will become the responsibility of the aggregate operation. This report includes hydrologic data for the 2002 water yeaz (October 2001 through September 2002). 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 yeaz 2002. With this data, trends in ground water and surface water may be 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 Cazbon Junction Mine were presented in the 1995 Annual Hydrologic Report. Additional information is presented in subsequent annual reports in addition to this report. Locations of monitored springs and wells aze 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 Larbon Junction Mine Page 1 Mnual F{ydrologlc Report for Water Year 7A02