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Trapper Mine made an inventory of wells down gradient and within one mile of the proposed permit <br />• area. As shown on Map M-31, 38 wells fall within this area. However, based on all existing <br />information, only four wells may possibly be connected with the Third White Sandstone. The four <br />wells are W-1406-78, 93848, 151991, W-624-74 and 80998. From the specific well completion data <br />(Tables 2.7-22b and 2.7-22c), it has been determined that two of the four wells have the potential to <br />be impacted by future mining operations. These wells are W-624-74 and 80998. <br />Well 1406-78 was not constructed as outlined in the water rights filing. Map M31 shows the correct <br />location of this well. Originally this well was considered as a separate well from well permit No. <br />91071, when in actuality they are the same well with dual numbers. The well is completed and the <br />water rights decreed to Mr. Francis Lux of Craig. The Lux well is located at Mr. Lux's house and not <br />to the south as originally thought. Based on the well depth (200 feet) and a structure map on the <br />base of the I coal seam (Appendix V) it has been determined that this well is completed in the First <br />White Sandstone, not the Third as originally thought. <br />Wells 93848 and 151991 will likely not be impacted by mining operations that occurred in Browning <br />and Colt pits, ending in 1993. The strike and dip of the HI coal seams indicates that both wells are <br />completed above the H coal seam. Therefore, it is likely that these wells will not have direct <br />• communication with ground water that flows through the backfill aquifer in the Browning and Colt pits. <br />In the alternative, assuming good contact between the HI backfill area and wells 93848 and 151991, <br />estimated travel times of 20 and 16 years, respectively, were obtained. A gradient of 0.067 ft/ft was <br />obtained for the 1996 HI aquifer water-level elevation map in this area and the use of an average <br />permeability of 0.5 ft/day along with an effective porosity of 0.1, were used to obtain this travel time <br />over the 3,600 and 3,000 foot distances, respectively. <br />The potential to affect water rights for the MacNamara Ditches is dependent on impacts to the water <br />source, well CA-2259 (Map M-31). This well was constructed to provide irrigation, stockwater and <br />water for domestic use to the <br />• <br />4-226a <br />revision. L- <br />Approved.