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OAKIiIDGE ENERGY, INC. <br />CARBON JUNCTION MINE (C-1992-080) <br />ANNUAL HYDROLOGIC REPORT <br />WATER YEAR 2005 <br />The Oakridge Energy, Inc. Cazbon junction Mine (CDMG Permit No. C-1992-080) is <br />located approximately 2 '/z 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. Carbon Junction <br />Canyon is an intermittent tributary of the Animas River. Much of the Cazbon 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 Cazbon 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 IvI'med 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 activities at the <br />Cazbon Junction Mine included opening both the North and South pits. Ancillary activity <br />included construction of a permanently reclaimed spoils azea, sediment control structures, <br />topsoil stockpiles, and pads for equipment. Permanent reclamation at the mine site was <br />initiated in 1998 and included the final regrading of the permanently reclaimed spoils azea <br />and initiation of reconstruction of the Snal configuration for Carbon Junction Canyon. In <br />2003, backfilling, grading, and topsoiling of the South Pit was completed. The South Pit <br />and ancillary areas were ceded to the Four Comers Materials Ewing Mesa #1 operation <br />and incorporated into that CDMG construction materials mining and reclamation permit. <br />This report includes hydrologic data for the 2005 water year (October 2004 through <br />September 2005) and the fourth calendar quarter of 2005. Tables 1-5 present the <br />summaries of water sampling data for springs and wells in the monitoring program. <br />Figures in this report show trends from water year 1995 to water year 2005. With this <br />data, trends in ground water and surface water may be analyzed. Figures were not <br />generated for chemical constituents that were analyzed consistently at or below the current <br />detection level. Hydrologic data were collected for the Cazbon Junction Mine from 1982 <br />to 1995, except for the second, third, and fourth calendar quarters of 1988. These data <br />and along-term analysis of ground water and surface water at the Cazbon Junction Mine <br />were presented in the 1995 Annual Hydrologic Report. Additional information is <br />presented in subsequent annual hydrology reports in addition to this report. Locations of <br />monitored springs and wells are found on the well and spring map within the permit <br />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 />Carbon Junction Mine Page 1 <br />Annual Hytlrologic Report for Water Year 2006 <br />