Laserfiche WebLink
<br />Description of the Environment <br />Hydrologic Balance - Rules 2.04.5, 2.04.7, 2.05.3(41, 2.05.6(3) and 4.05 <br />Ground water information is found in Section 2.04.7, Volume 1 of permit <br />C-84-062. Additional information is found on Mao 1, Twentymile Park <br />Hydrology, Map 4a; Energy Mine No. 3 Hydrology, Map 17; Stream Channel <br />Cross-Sections, Map 21a: Detention Basin Cross-Sections; Tables 26 and 30, and <br />Figures 6A, 66, and 8. <br />A description of ground water occurrence and mining impacts on ground water <br />within the permit and adjacent areas can be found in "Probable Hydrologic <br />Consequences of Mining" section of this document and the "Cumulative <br />Hydrologic Impact Study" document for this mine area. <br />There are three regional bedrock aquifers within the permit and adjacent areas <br />of the Energy Mine No. 3. These aquifers are the Trout Creek Sandstone, the <br />Twentymile Sandstone, and the Wadge coal-overburden zone. <br />The alluvial deposits of Trout Creek and its tributaries are also important <br />sources of ground water. The alluvial bodies are used as water supplies, <br />provide subirrigation to vegetation and supply base flow to the streams. The <br />alluvial bodies are recharged by both the streams and the bedrock aquifers. <br />The two alluvial aquifers within the permit boundary are the Foidel Creek <br />alluvium and the Middle Creek alluvium. These aquifers do not receive <br />significant water from the bedrock ground water system. Most of the water in <br />these aquifers is from surface runoff. <br />A description of the surface water system in the proposed permit and adjacent <br />area is contained in Section 2.04.7, Volume 1 of the permit application. <br />Supporting information is given in Mao 4a, Energy Mine No. 3 Hydrology; <br />Tables 27, 28, and 29; and Figures 7, 9, and 11. <br />A description of surface water occurrence and mining impacts on surface water <br />within the permit and adjacent areas can be found in the "Probable Hydrologic <br />Consequences of Mining" section of this document, and the "Cumulative <br />Hydrologic Impact Study" document for this mine area. <br />The permit area is located in the upper reaches of the Yampa River Basin, at <br />an approximate elevation of 7,000 feet above sea level. The area is drained <br />by Foidel Creek and Middle Creek (Figures 1 and 21. Middle Creek is <br />intermittent, flowing in response to snow melt or precipitation events. <br />Foidel Creek is perennial at this time, due to mine dewatering and spoil <br />spring inputs upstream. The confluence of Foidel Creek with Middle Creek is <br />immediately northwest of the mine area within the permit boundary. <br />Middle Creek drains into Trout Creek east of the northern most section of the <br />permit boundary. <br />- 4 - <br />