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• Groundwater Uses <br />General Area <br />Groundwater uses in the general and permit areas of the Colowyo mine are minimal and of <br />]ow volume. Questions were raised in the past concerning well yields within four miles of the <br />mine site. At that time the Colowyo Coal Company undertook a program to investigate <br />reported yields 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 <br />have reported well yields of 50 gal,/min. The remaining wells have re rted yields of less <br />than 16 gal./min; most of the wells have reported yields of less then 7 gal./min. The well <br />yields were not field checked to determine actual use or rate of use. There are no wells that <br />have reported yields in excess of 50 gal./min. <br />Very little groundwater resource development has taken place in the Axial area. There are a <br />few relatively shallow, low-yield wells on or near the leasehold area that were dug for <br />domestic purposes. <br />Permit Area <br />Groundwater uses in the mine area are also limited due to the depth to water and its limited <br />overall availability. Colowyo has developed three wells on the mine area to supply a portion <br />of the domestic needs. The three deep wells, Taylor Creek Nos. 1 and 3 are located in Section <br />33, T4N, R93W, and in Section 4, T3N, R93W respectively. Wel] number 61171F is located <br />in Section 3, T3N, R93W. Taylor Creek No. 1, completed to a depth of 825 feet in the <br />Williams Fork Formation, produces 40 gpm with a static water level of 110 feet. Taylor <br />Creek No. 3, completed to a depth of 2,284 feet in the Iles Formation, produces 20 gpm with <br />a static water level of 135 feet. Well 61171F was completed to a depth of 960 feet and has a <br />production rate of 3.5 gpm. <br />The information collected from the Colowyo Mine area indicates that groundwater is very <br />limited, even to depths significantly below mining activities. This conclusion is supported by <br />the depths of the potable wells, Taylor Creek No. 1, Taylor Creek No. 3 and Well 61171F, <br />necessary for sustained production. Further evidence of lack of <br /> <br />2.04.7-25 Revision Date: 9/01/05 <br />Revision No.: MR-74 <br />