2007-11-08_PERMIT FILE - C1981041 (2)

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If the actual strain were of great enough magnitude to separate or fracture either the welded steel pipeline or the cast iron pipeline, the resulting changes would not cause material damage or diminution of reasonably foreseeable use of the structures as defined in Rule 2.05.6(6)(e)(ii). The magnitude of the damage of a worst case scenario would not prevent the structure from promptly being restored to pre-subsidence condition . Considering diminution of reasonably foreseeable use, the capability of the structures before and after the subsidence occurrence would not change. A significant fracture in the Ute Water pipeline which reduces the supply flow will be detected immediately at the treatment plant. Ute Water has precise meters that measure water entering the pipe at its source and exiting the pipe at the treatment plant. Should there be a difference in the readings, Ute will search for the leak. Additionally, the static head on the pipe varies from 131 to 275 psi over the mined area. Such high pressures should lead to relatively easy leak detection. A break in • the pipeline within the permit area and adjacent area will be detected and located within three hours. The repair on a major break requires from 12 to 16 hours. Materials and spare pipe used to repair the pipeline are stored at the treatment facility to insure availability for prompt repairs. The present storage capacity for Ute Water facility is 6 million gallons which is enough to supply water users for approximately 18 to 20 hours. Based on this information, material damage or diminution of reasonably foreseeable use of the Ute Water pipeline will not occur. In the event of separation or fracturing of the Palisade pipeline, the reduced flow to the storage reservoir is detected by a level alarm at the facility. Maintenance personnel are on duty 24 hours per day, and repair crews are required by Health department regulation to react within 30 minutes of the level alarm. Most repairs on the pipeline are completed, from detection to return to service, in less than 12 hours. Major breaks are usually repaired within 24 hours. 20-6 (Rev. 01 /01)