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• INTRODUCTION <br />The Eagle #5 and #6 Mines are underground coal mines, located approximately seven <br />miles south of Craig, Colorado (Figure 1). The aerial extent of the underground workings in <br />the #5 Mine was approximately 2,040 acres at the end of 1990 and since active mining in <br />the #5 Mine ceased in 1990 this acreage has not changed. The mains connecting the 5 <br />and 5A portals in the #5 Mine are still used for access to the #& Mine. The coal extraction <br />is from the Cretaceous Age Williams Fork Formation, in the "E1"Seam in the #6 Mine. <br />Hydrologic monitoring has been conducted at the mine site since 1980. This report <br />presents the results of year 1994 monitoring. The complete 1983 through 1993 monitoring <br />is presented in the respective Annual Reports for each calendar year. The hydrologic <br />monitoring is divided into two parts: 1) groundwater, and 2) surface water. The monitoring <br />locations are shown in Figure 2 and summarized in Table 1. The water quality monitoring <br />• includes field parameters (Table 2), water quality parameters (Table 3), and NPDES <br />parameters (Table 4). The water quality samples are analyzed by ACZ Laboratories, Inc., <br />Steamboat Springs, Colorado, a USEPA certified laboratory. This report includes data <br />collected specifically to meet requirements of the Colorado Division of Minerals & Geology <br />(DMG), as well as data collected to meet the requirements of the Colorado Wastewater <br />Discharge Permit System (NPDES permits). <br /> <br />1 <br />