REP12031 - Laserfiche WebLink

Home Browse Search

~~n i :~ CARBON JUNCTION MINE (C-92-080) ANNUAL HYDROLOGIC REPORT WATER YEAR 1998 The Oakridge Energy, Inc. Cazbon Junction Mine (CDMG Permit No. C-92-080) is located approximately 2 % 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 Cazbon Junction Canyon drainage has a steep grade with a total drainage basin of 0.8 square 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 quahty during the life of the mining permit. The mine site was originally permitted by the Division of Minerals and Geology (CDMG), formerly Mined Land Reclamation Division, in 1983 and recently 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 Carbon 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 reconstruction of the final configuration for Carbon Junction Canyon. This report includes hydrologic data for the 1998 water yeaz (October 1997 through September 1998). Tables l-5 report the summaries of water sampling data for springs and wells in the monitoring program. Figures in this report show trends from water yeaz 1995 to water year 1998. 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 normal detection level. Hydrologic data were collected for the Cazbon Junction Mine from 1982 to the present except for the second, third, and fourth calendaz quarters of 1988. This 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 and this report. Locations of monitored springs and wells are found on the well and spring map within the permit document. In addition to the hydrologic monitoring undertaken for springs and groundwater wells at the mine, monitoring of discharges from the sediment ponds are undertaken. Sediment ponds aze also inspected on a quarterly basis for compliance with CDMG regulations. Information on discharges and sediment pond inspections follows the hydrologic monitoring program information. -1-