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<br /> <br />' INTRODUCTION <br />The Eagle #5 and #6 Mines are underground coal mines, located <br />t approximately seven miles south of Craig, Colorado (Figure 1). <br />The aerial extent of the underground workings in the #5 Mine was <br />' approximately 2,040 acres at the end of 1990. Approximately 222 <br />acres had been mined in the #6 Mine at the end of 1990. Active <br />mining in the #5 Mine has ceased but may be resumed in the future. <br />' The #5 Mine is still used for access to the #6 Mine. The coal <br />being mined is from the Cretaceous Age Williams Fork Formation, "F" <br />' Seam in the #5 Mine and the "E" Seam in the #6 Mine. <br />' Hydrologic monitoring has been conducted at the mine site since <br />1980. This report presents the results of the 1990 monitoring. <br />' The complete 1983 through 1990 monitoring is presented in the <br />respective Annual Reports for each calender year. <br />' The hydrologic monitoring is divided into two parts: 1) ground <br />water, and 2) surface water. The monitoring locations are shown <br />' in Figure 2 and summarized in Table 1. The water quality <br />monitoring includes field parameters (Table 2), water quality <br />' parameters (Table 3), and NPDES parameters (Table 4). The water <br />quality samples are analyzed by ACZ Laboratories, Inc., Steamboat <br /> Springs, Colorado, a USEPA certified laboratory. This report <br /> includes data collected specifically to meet requirements of the <br /> Colorado Mined Land Reclamation Division (CMLRD), as well as data <br />' collected to meet the requirements of the Colorado Wastewater <br /> Discharge Permit System (NPDES permits). A complete listing of all <br />' the water quality data is submitted separately. <br /> <br />1 <br />