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developed. No ground water impacts requiring mitigation are forecast. However, should a ground <br />water supply be diminished to such an extent that it precludes its use, WFC will replace this supply <br />with surface water available to them or will replace the well. Only 62.1 acre -feet of CCC water is <br />required for the surface water augmentation plan. <br />Alluvial Valley Floors <br />Introduction <br />At the request of the CDMG, Peabody submitted, on November 17, 1980, a report entitled <br />"Reconnaissance Investigation for the Identification of Potential Alluvial Valley Floors in the Vicinity <br />of the Nucla Mine ". The reconnaissance area included those portions of Tuttle and Calamity Draws <br />which are adjacent to or near the New Horizon Mine. The San Miguel River was not taken into <br />consideration. However, CDMG undertook a study in 1983 to determine if the San Miguel River <br />could be considered a potential alluvial valley floor where it runs adjacent to the New Horizon Mine. <br />The results of that study determined that there was a sufficient distance separating the mine from <br />the San Miguel River to mitigate any impacts that may occur. Refer to the CDMG's Nucla Mine <br />Proposed Decision and findings of Compliance Document (1983) for the results of their study. <br />The discussion that follows is based on information contained in Section 2.04.7, field observations, <br />and interpretation of false -color infrared and color aerial photographs at scales of 1" = 500'. <br />Geomorphology <br />The areas (First and Second Park) in which the New Horizon Mine and the New Horizon 2 mining <br />area are situated were formed by a regional uplift of sedimentary rocks with the uppermost strata <br />being the Cretaceous Dakota sandstone and Burrow Canyon formations. The formations are <br />overlain by varying thicknesses of undifferentiated eolian silts and sands. These deposits have <br />subsequently been reworked by water, forming rolling upland valleys that are dissected by both <br />Tuttle and Calamity Draws. Since completion of the Colorado Cooperative Company's main <br />irrigation ditch around 1910, the unconsolidated deposits have been further reworked by man to <br />form broad rolling valleys across the First and Second Park, making the area more conducive for <br />irrigation and agriculture. <br />The New Horizon 2 mining area is located entirely within the Calamity Draw watershed (7.0 square <br />miles) which is less than half the size of the Tuttle Draw watershed. Calamity Draw is also an <br />upland drainage area that is tributary to the San Miguel River. The middle and upper portion of this <br />watershed (the First Park) has been intensively irrigated and cultivated since about 1910. <br />Revised September 2014 JR -64) 2.05.6(3) -14 <br />