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5e~ ~ i <br />RECEIVED <br />JUN ? 2 2000 <br />CARBON JUNCTION MINE (C-92-080) <br />ANNUAL HYDROLOGIC REPORT DivisionotMinera~sBGeology <br />WATER YEAR 1999 <br />The Oakridge Energy, Inc. Carbon Junction Mine (CDMG Permit No. C-92-080) is <br />located approximately 2 % miles southeast of Durango, Colorado. The mine is located on <br />an area known as Ewing Mesa neaz 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 Carbon Junction <br />Canyon drainage has a steep grade with a total drainage basin of 0.8 square 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 area, sediment control structures, topsoil <br />stockpiles, and pads for equipment. Permanent reclamation at the mine site was initiated in <br />1998 and included the final regrading of the permanently reclaimed spoils area and <br />reconstruction of the final configuration for Carbon Junction Canyon. <br />This report includes hydrologic data for the 1999 water year (October 1998 through <br />September 1999). Tables 1-6 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 yeaz 1999. 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 normal detection level. Hydrologic data were collected for <br />the Carbon Junction Mine from 1982 to the present except for the second, third, and <br />fourth calendar quarters of 1988. This 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 are found on the well and spring <br />map within the permit document. <br />In addition to the hydrologic monitoring undertaken for springs and groundwater wells at <br />the mine, monitoring of dischazges from the sediment ponds aze undertaken. Sediment <br />ponds are also inspected on a quarterly basis for compliance with CDMG regulations. <br />Information on dischazges and sediment pond inspections follows the hydrologic <br />monitoring program information. <br /> <br />-1- <br />