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• No treatment other than clarification is required for the process water. If further treatment is required, it <br />will probably be in the form of baffling the process settling pond to create iwo settling stages; one to <br />which a coagulant can be added for increased sedimentation, and the other to be utilized for treatment if <br />acidity must be controlled. In addition, if required, a filtration unit such as a rapid filter could be added to <br />the system. <br />Water for washdown purposes comes from raw water storage and is reclaimed through sumps located <br />in the process buildings. Losses due to evaporation or from water that cannot be caught in sumps are <br />included in the miscellaneous losses shown on the water supply and sewage Veatment flow schematic. <br />IV.F.5 Domestic Sewage Treatment Domestic sewage is on the order of 10,000 to 15,000 gallons per <br />day. Since this volume of sewage is small, two packaged sewage treatment plants are utilized, one at <br />the "D" Portal Area and one at the Railroad Loadout Area. The plants are similar to those manufactured <br />by Demco for offshore oil drilling platforms, ocean-going ships, marinas, and homes. They are skid <br />mounted and come in various sizes which may be coupled for increased volumes. <br />The treated sewage at the "D" Portal facility is discharged into the process settling pond and utilized in <br />the preparation plant process cycle. <br />IV.F.6 Potable Water Potable water for the "D" Portal Area is supplied by the surface lagoon near the <br />shallow alluvial wells near the White River and, after treatment, is stored in the potable water storage <br />tank. The quality of water from these wells is such that chlorination and a reverse osmosis plant is <br />required to meet State Board of Health requirements. Water is taken from the raw water tank, treated, <br />and then stored in the potable water storage tank. The size of the storage tank is based on 30 gallons <br />per person per day for 500 persons and approximately three days storage for a minimum of 72 hours <br />detention time. <br />The potable water supply for the coal transportation facilities consists of a pipeline from the mine area <br />clean water storage tanks to the maintenance and office building area. The potable water system also <br />includes a distribution system that serves all buildings at the Railroad Loading Area. The buildings are <br />connected into a sewage main system so that sanitary wastes can be sent to the treatment facility. <br />IV.G Upgrading of Rio Blanco County Route 65 <br />The pre-existing Rio Blanco County Route 65 which provided access to the mine areas was widened <br />and surfaced with asphalt to provide an all weather road adequate to handle the construction and mine <br />operation traffic. Adequate drainage ditches and culverts were added. The road was widened for two <br />lane traffic and sharp horizontal and vertical curves realigned in accordance with applicable state and <br />county standards. The preliminary design of the road cress-section was based on the U.S. Bureau of <br />• Mine Permit Renewal #3 (Rev. 8/99) IV-29 <br />