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• The CDMG concluded in its Decision and Findings of Compliance Document (1983) that no alluvial <br />valley floors exist in either the New Horizon permit area or the potentially affected area (Tuttle <br />Draw) associated with the New Horizon Mine. WFC concludes, based on the following criteria, that <br />no alluvial valley floors exist along the potentially affected area of Calamity Draw associated with <br />the New Horizon 2 mining area. Water availability, quality, the limited extent of the unconsolidated <br />streamlaid deposits and subirrigated areas, and the incised nature of Calamity Draw make it <br />infeasible and impractical to construct a flood irrigation system employing gravity drainage. This <br />conclusion is substantiated by the results of an EPA alluvial valley floor study (EPA 1977) which <br />addresses most coal mining areas of the west and the fact that flood irrigation is not being practiced <br />along Calamity Draw. <br />Finally, based on geomorphic criteria alone, neither Tuttle or Calamity Draws meet the necessary <br />criteria to be identified as alluvial valley floors, as they display geomorphic features that are <br />indicative of upland areas rather than alluvial valley floors. <br />Hydrology Monitoring Plan <br />When Western Fuels-Colorado (WFC) purchased the Nucla Mine (now the New Horizon Mine) from <br />• Peabody Coal Company in April,1992, there was (and is) existing mining permit C-81-008 covering <br />the property. WFC will continue to operate under that permit. <br />WFC has developed a new hydrological monitoring program with the advice and consent of CDMG. <br />The monitoring program is described in detail in Section 2.04.7. <br />B) PROBABLE HYDROLOGIC CONSEQUENCES <br />In support of its original application to mine the Nucla and Nucla East properties (now the New <br />Horizon 1 and New Horizon 2 mining areas), Peabody Coal Company performed extensive and <br />detailed computer modeling to determine probable hydrologic consequences of mining. Details of <br />the computer modeling are available in Peabody Tab 17. <br />This discussion incorporates water monitoring results through the spring of 2001, which have been <br />valuable in predicting long term probable hydrologic consequences. <br />• (REV~sED s/O7) 2. O5. 6 (3) - 14 <br />