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• augmentation plan was then developed for augmenting these surface water losses during each month of the irrigation period and storing water during the winter months (fable 9 in Attachment 16- 1). Calculations were performed for Tuttle and Calamity Draws and the San Miguel River to determine if mine discharges would diminish receiving water quality to the extent that surface water rights would be injured (preclude present or potential uses of the water). This was determined not to be a significant impact and no mitigation is required. Peabody will use the following altemative water sources to mitigate any ground or surface water right impacts. Peabody has available to them 114.5 acre-feet of surface water, which is a consumptive use credit associated with Peabody's ownership of 27 shares of the Colorado Cooperative Company (CCC). Peabody has an absolute 4 acre-foot storage right for the 001 reservoir at the Nucla mining area and is projected to have 18 acre-feet of pit pumpage during the non-irrigation season available to them for use. Peabody also has a 1.5 acre-foot ground water right associated with the mined out shop well. • It is from these altemative sources of water that the surface water augmentation plan has been developed. No ground water impacts requiring mitigation are forecast. However, should a ground water supply be diminished to such an extent that it precludes its use, Peabody will replace this supply with surface water available to them (only 62.1 of the 114.5 acre-feet of CCC water is required for the surface water augmentation plan) or will replace the well. Introduction. At the request of the CMLRD, Peabody submitted, on November 17, 1980, a report entitled "Reconnaissance Investigation for the Identification of Potential Alluvial Valley Floors in the vicinity of the Nucla Mine". The reconnaissance area included those portions of Tuttle and Calamity Draws which are adjacent to or near the Nucla Mine. The San Miguel River was not taken into consideration. However, CMLRD undertook a study in 1983 to determine if the San Miguel River could be considered a potential alluvial valley floor where it runs adjacent to the Nucla Mine. The results of that study determined that there was a sufficient distance separating the mine from the San Miguel River to mitigate any impacts that may occur. Refer to the CMLRD's Nucla Mine Proposed Decision and findings of Compliance Document (1983) for the results of their study. The discussion that follows is based on information contained in Tab 7, field observations, and interpretation of false-color infrared and color aerial photographs at scales of 1" = 500', • 16-7