1986-06-13_GENERAL DOCUMENTS - C1981018

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• -16- Western Fuels has obtained, an approved NPDES permit (No. C-0038024) for all discharge points at the mine. A copy of the permit is provided in Illustration 13 of Volume 11 of the permit application. Discharge of Ground Waters at Surface Although ground water inflow into the mine is expected to be very low, the permittee has estimated that faulting might yield flows of 5 to 10 gallons per minute on a local short-term basis. Furthermore, fractured zones encountered during mining could potentially yield 100 to 300 gallons per minute for a short time. This water will not be pumped into a sediment pond, but will be discharged to a holding tank on the surface. Part of the water will be stored for use in the mine and some of it will be treated for use in the surface facilities (Pages II C-106, and C-108). If storage capacities are exceeded by mine inflows, excess water will be treated as necessary in processing ponds PP-1 and PP-2 and discharged at point 004 of the approved NPDES permit. Surface Water Control Facilities Basic information pertaining to surface water control measures for the Deserado Mine surface facilities can be found in Sections IV.J. and V.A. of Volume 4, Illustration 13 of Volume 11 and Illustrations 31 and 34 of • Volume 12 of the permit application. Surface facilities at the mine consist of the D-Portal area and explosives magazine, water storage area, overland conveyor system, slot storage facility, rail loadout/loop, coal processing waste disposal area, ventilation entry, alluvial well area, and the Halandras garbage dump. Surface water control measures for all light duty, access, and haul roads at the mine are discussed in Section XX of this findings document. All surface waters draining from disturbances associated with surface coal mining operations (except roads) are controlled and treated through the use of berms, ditches, diversions, sediment ponds, and/or alternative sediment control measures for the above facilities. All ponds, ditches, diversions, berms, and alternative sediment control measures ww*- re-viewed during the original permit submittal or subsequent revisions to the permit and approved by the Division. Concerns which were originally stipulated in the 1981 findings have all been subsequently resolved. Stream Buffer Zones At the time of original permit issuance, the Division authorized the loction of the Deserado Mine alluvial well field facility within 100 feet of the White River. The authorization was based on a specific finding that the water quantity and quality from the stream section within 100 feet of the facility would not be- adversely affected. Please refer to section V.B.8 of this • findings document for details. Rule 4.05.18 also requires a finding be made that "the original stream channel be restored. " This will not be possible, however due to the installation of Kenney Reservoir in the area of the alluvial well field which has resulted in the complete inundation of the original stream channel to 'ia level at or slightly above the 100 year flood plain of the river. As sue'h, the finding required by Rule 4.05. 18(l ) (a) is