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Materials and spare pipe used to repair the lines are stored at the treatment facility <br />as well as at various locations along the service road to insure prompt repair. The <br />storage capacity of the Palisade facility is 5 million gallons. Considering that Ute <br />Water can service approximately 45,000 water users for 18 to 20 hours on 6 million <br />gallons reserve, the Town of Palisade can supply the less than 5,000 Palisade <br />water users for a much longer time period than is required to repair the water <br />supply line and bring the treatment facility back into service. Based on this <br />information, material damage or diminution of foreseeable use of the Palisade <br />pipelines will not occur. <br />Worst case predictions for subsidence affects on the 345KV Colorado Ute <br />transmission line are given in Appendix 20-5. Current projections for mining in the <br />area of this line involve mining 70 ft. X 70 ft. entry and cross-cut centers (50 x 50 <br />remaining pillar size) for development mining with no secondary mining projected. <br />This results in an extraction rate of 49%. The depth of cover will range from 1500 <br />• ft. to 2300 ft. and the mining height will range from 5 to 7 feet. The worst case <br />scenario for room and pillar mining in tables 3 and 5 of this appendix assumes 76% <br />extraction, 1200 to 2400 ft. of cover and an 8 ft. mining height. In this worst case at <br />1500 ft., vertical subsidence would be 1.07 ft., tilt would be 20.8 minutes or 0.71 ft. <br />fora 117 ft. tower and the maximum diagonal displacement of the base would be <br />0.14 feet. The actual affects would be considerably less for our projected mining <br />practices. If subsidence were to occur on these towers, shimming under the legs or <br />replacement of deformed members could be done without disruption of service. <br />Worst case scenarios for the Powder Mountain Ranch (PMR) and Fontinari ponds <br />and ditches could be localized dewatering into the subsidence cracks. This <br />occurrence will generally be at a spot location which can be easily located. Repair <br />would involve excavating 2 - 4 ft. deep along the crack, compacting a clay type soil <br />over the crack, and back filling the excavation. <br />s <br />20-7 (Rev. 01 /01) <br />