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CARBON JUNCTION MINE (C-92-080) <br />ANNUAL HYDROLOGIC REPORT <br />WATER YEAR 1996 <br /> <br />The Oakridge Energy, Inc. Carbon Junction Mine (CDMG Permit No. C-92-080) is <br />located approximately 2'fz miles southeast of Durango, Colorado near the juncture of <br />Highways 160 and 550. The mine is located on an area known as Ewing Mesa. The <br />mine site is located in the upper drainage basin of Carbon Junction Canyon. This <br />canyon is an intermittent tributary of the Animas River. Carbon Junction Canyon's <br />total drainage basin is 0.8 square miles. Much of the drainage has a steep grade. <br />Hydrologic sampling and data collection has been conducted at the Carbon Junction <br />Mine since 1982 in order to ensure protection of water quality. The mine site was <br />originally permitted by MLRD (Mined Land Reclamation Division) in 1983 and most <br />recently re-permitted by CDMG (Colorado Division of Minerals and Geology) in 1993. <br />To date coal mining activity has been initiated on the site on a minor scale. The extent <br />of coal mining at the Carbon Junction Mine includes opening the north and south pits. <br />Ancillary activity has included construction of an excess overburden fill, sediment <br />control structures, topsoil stockpiles, and pads for equipment. No reclamation has <br />occurred at the mine site. <br />This report will present hydrologic data for the 1996 water year. Accompanying charts <br />in this report will show trends from water year 1994 to water year 1996. With this <br />data trends in ground water and surface water may be analyzed. Charts were not made <br />for constituents that were analyzed consistently below the normal detection level. <br />Hydrologic data were collected for the Cazbon Junction Mine from 1982 to the present <br />except for the second, third, and fourth quarters of 1988. This data and along-term <br />analysis of ground water and surface water at the Carbon Junction Mine were presented <br />in the 1995 hydrologic report. Additional information is presented in that report. <br />Locations of monitored springs and wells are presented on the attached map. <br />DESCRIPTION OF HYDROLOGIC PROGRAM <br />The hydrologic program followed for the Carbon Junction Mine for the 1996 water <br />year is described below. <br />Spring Monitoring <br />REA SPG #3 and CJ-LO-SPG #4 were monitored each quarter from the fourth quarter <br />of 1995 through the third quarter of 1996. The monitoring included afull-suite <br />laboratory analysis as well as field parameters of pH, conductivity, temperature, and <br />flow. <br />