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Findings Document, dated August 2, 1984 was revised November 5, 1990 for the first renewal (RN-O1) and on June 26, 1995 for the second renewal (RN-02). Description of the Environment Hydrolo~ic Balance -Rules 2.04.5. 2.04.7. 2.05.3(41. 2.05.6(31 and 4.05 Ground water information is found in Section 2.04.7, Volume 1 of permit C-84-062. Additional information is found on Map 1, Twentymile Pazk Hydrology, Map 4a; Mine No. 3 Hydrology, Map 17; Stream Channel Cross-Sections, Map 21a; Detention Basin Cross-Sections; Tables 26 and 30, and Figwes 6A, 6B, and 8. A description of ground water occurrence and mining impacts on ground water within the permit and adjacent areas can be found in "Probable Hydrologic Consequences of Mining" section of the permit application and the Yampa River CHIA which includes the Mine No. 3 azea. There aze three regional bedrock aquifers within the permit and adjacent azeas of Mine No. 3. These aquifers aze the Trout Creek Sandstone, the Twentymile Sandstone, and the Wadge coal-overbwden zone. The alluvial deposits of Trout Creek and its tributazies aze also important sources of ground water. The alluvial bodies aze used as water supplies, provide subirrigation to vegetation and supply base flow to the streams. The alluvial bodies aze recharged by both the streams and the bedrock aquifers. The two alluvial aquifers within the permit boundary are the Foidel Creek alluvium and the Middle Creek alluvium. These aquifers do not receive significant water from the bedrock ground water system. Most of the water in these aquifers is from surface runoff. A description of the swface water system in the proposed permit and adjacent azea is contained in Section 2.04.7, Volume 1 of the permit application. Supporting information is given in Map 4a, Mine No. 3 Hydrology; Tables 27, 28, and 29; and Figures 7, 9, and 11. A description of swface water occurrence and mining impacts on surface water within the permit and adjacent azeas can be found in the "Probable Hydrologic Consequences of Mining" section of the permit application and the Yampa River CHIA which includes the Mine No. 3 azea. The permit azea is located in the upper reaches of the Yampa River Basin, at an approximate elevation of 7,000 feet above sea level. The area is drained by Foidel Creek and Middle Creek (Figwes 1 and 2). Middle Creek is intermittent, flowing in response to snow melt or precipitation events. Foidel Creek is perennial at this time, due to mine dewatering and spoil spring inputs upstream. The confluence of Foidel Creek with Middle Creek is immediately northwest of the mine azea within the permit boundary. Middle Creek drains into Trout Creek east of the northern most section of the permit boundary. 4