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RULE 2 PERMITS <br /> concentrations of minerals available to leaching decrease. Considering the physical condition and <br /> mineralogy of the spoils,the predicted effects of the spoil would be a gradual increase in TDS and <br /> associated major ions for a period of time, followed by a general and gradual decrease in <br /> concentration back to ranges seen in background data and Table 2.04.7-6. <br /> Groundwater Uses <br /> General Area <br /> Groundwater uses in the general and permit areas of the Colowyo mine are minimal and of low <br /> volume. Questions were raised in the past concerning well yields within four miles of the mine <br /> site. At that time the Colowyo Coal Company undertook a program to investigate reported yields <br /> based on the Colorado State Engineer's records. <br /> A search of the State's files revealed that only three wells within four miles of the mine site have <br /> reported well yields of 50 gal./min. The remaining wells have reported yields of less than 16 <br /> gal./min; most of the wells have reported yields of less then 7 gal./min. The well yields were not <br /> field checked to determine actual use or rate of use. There are no wells that have reported yields <br /> in excess of 50 gal./min. <br /> Very little groundwater resource development has taken place in the Axial area. There are a few <br /> relatively shallow, low-yield wells on or near the leasehold area that were dug for domestic <br /> purposes. <br /> Permit Area <br /> Groundwater uses in the mine area are also limited due to the depth to water and its limited overall <br /> availability. Colowyo has developed two wells on the mine area to supply a portion of the domestic <br /> needs. The two deep wells, Taylor Creek Nos. 1 and 3 are located in Section 33, T4N,R93W, and <br /> in Section 4, T3N, R93W respectively. Taylor Creek No. 1, completed to a depth of 825 feet in <br /> the Williams Fork Formation, produces 40 gpm with a static water level of 110 feet. Taylor Creek <br /> No. 3, completed to a depth of 2,284 feet in the Iles Formation, produces 20 gpm with a static <br /> water level of 135 feet. <br /> The information collected from the Colowyo Mine area indicates that groundwater is very limited, <br /> even to depths significantly below mining activities. This conclusion is supported by the depths of <br /> the potable wells,Taylor Creek No. 1 and Taylor Creek No. 3,necessary for sustained production. <br /> Further evidence of lack of significant groundwater resources in and adjacent to the mine area is <br /> that residents in the general area haul drinking water from Craig or Meeker. <br /> Groundwater is not currently planned for industrial purposes such as watering haul roads or dust <br /> control in the loadout facilities. Water for these purposes will be supplied by Wilson Reservoir <br /> located in Section 13, T4N, R93W. See Map 32 for the location of the reservoir and pipeline for <br /> conveyance to the mine area. <br /> Rule 2 Permits 2.04-19 Revision Date: 12/20/19 <br /> Revision No.: TR-135 <br />