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State Reg. <br />• <br />HYDROLOGY <br />The following section delineates the hydrology of the Seneca II Mine. <br />Included in this section are ground water information, surface water <br />information, measures for the control of surface water, and water <br />rights. In addition, a reconnaissance evaluation of alluvial valley floors <br />is given in Appendix 7-7. <br />• <br />110(2)(1) I. GROUND WATER INFORMATION <br />Since the mid-1970's, ground water in the cool bearing portion of the <br />Yampa River Basin has been the subject of intense investigation by <br />several federal and state government agencies and by coal companies <br />concerned with its protection. Previous reconnaissance investigations on <br />regional ground water occurrence in the general area have been per- <br />formed by Brogden and Giles (1977) and Boettcher (1972). Much informa- <br />tion concerning overburden and mine spoil water quality in the <br />Twentymile Park area were reported by McNfhorter (1975 and 1979), <br />Skogerboe (1980), and Hounslon (1978). In addition, several on-going <br />studies on the hydrogeology of undisturbed areas, recharge capacity of <br />reclaimed spoils, solute transport, and reconnaissance monitoring are <br />currently in progress by the U.S. Geological Svrvey -Water Resources <br />Divisipn (USGS-WRD). <br />Seneca Coals, Ltd. hvs encouraged and currently maintains close coop- <br />eration with the USGS-WRD in collecting ground water information <br />pertinent to the Seneca 11 permit area and adjacent areas. This informa- <br />tion, with other sources, will be used to relate the geology, water quan- <br />tity, and water quality of ground water systems within the general and <br />adjacent areas to the Seneca II permit. It is believed that this descrip- <br />tion adequately addresses the general requirements for ground water <br />hydrology as stated in Section 779.13. <br />7-I Revised 5/27/81 <br />