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RAG, Empire Corporation 1999 AHR <br />~1 INTRODUCTION <br />The Eagle #5 and #6 Mines are underground coal mines, located approximately <br />seven miles south of Craig, Colorado (Figure 1) and operated by RAG Empire <br />Corporation (RAGEC). The aerial extent of the underground workings in the #5 Mine <br />was approximately 2,040 acres at the end of 1990 and since active mining in the #5 <br />Mine ceased in 1990 this acreage has not changed. The 5A portals and a short <br />section of the #5 Mine mains are still used for access to the #6 Mine. The coal <br />extraction is from the Cretaceous Age Williams Fork Formation, in the "E" Seam in the <br />#6 Mine. During 1999, no active mining took place as the RAG Empire Corporation <br />was idled due to unfavorable market conditions. Hydrologic monitoring has been <br />conducted at the mine site since 1980. This report presents the results of year 1999 <br />• monitoring. The complete 1983 through 1999 monitoring is presented in the <br />respective Annual Hydrology Reports for each calendar year. The hydrologic <br />monitoring is divided into two parts: 1) groundwater, and 2) surface water. The <br />monitoring locations are shown on Figure 2 with monitoring requirements for each site <br />summarized in Table 1. The water quality monitoring includes field parameters (Table <br />2), water quality parameters (Table 3), and NPDES parameters (Table 4). The water <br />quality samples are now analyzed by CT&E Laboratories, Denver, Colorado a USEPA <br />certified laboratory (Prior to 10/1/99, sample analysis was conducted by ACZ <br />Laboratories, Inc., Steamboat Springs, Colorado - also, a USEPA certified <br />laboratory). This report includes data collected specifically to meet requirements of the <br />Page 1 <br />