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• IV.F.4 Process Water The primary supply of the preparation plant process water is from the raw <br />water tank. Makeup water in the preparation plant is delivered at an approximate rate of 33,240 <br />gallons per day or 35 gpm based upon a 16-hour per day operation. Unknown quantities of water <br />which is lost through the clean coal and refuse or gained from the raw coal account for the varying <br />amount for the makeup water. Additional gains in water also come from groundwater pumped from <br />the mine, along with treated domestic sewage water. These additional waters are pumped directly <br />to the process settling pond for clarification prior to recycling into the plant process cycle. <br />In the event of a malfunction of the process filtration system, the dirty coal wash water can be <br />pumped into the process settling pond for clarification before returning to the wash cycle. The <br />emergency overlow pond is located so that water will flow into it without mechanical assistance in <br />case the pumps get clogged or there is a power failure. Effluent from the emergency overflow pond <br />will be pumped into the process settling pond. The process settling pond and the emergency <br />overflow pond have earth embankments and impervious liners. <br />No treatment other than clarification is required for the process water. If further treatment is <br />required, it will probably be in the form of baffling the process settling pond to create two settling <br />stages; one to which a coagulant can be added for increased sedimentation, and the other to be <br />utilized for treatment if acidity must be controlled. In addition, if required, a filtration unit such as a <br />rapid filter could be added to the system. <br />• Water for washdown purposes comes from raw water storage and is reclaimed through sumps <br />located in the process buildings. Losses due to evaporation or from water that cannot be caught in <br />sumps are included in the miscellaneous losses shown on the water supply and sewage treatment <br />flow schematic. <br />IV.F.S Domestic Sewage Treatment Domestic sewage is on the order of 10,000 to 15,000 <br />gallons per day. Since this volume of sewage is small, a packaged sewage treatment plant is <br />utilized at the "D" Portal Area. The plant is similar to those manufactured by Demco for offshore oil <br />drilling platforms, ocean-going ships, marinas, and homes. <br />The treated sewage at the "D" Portal facility is discharged into the process settling pond and utilized <br />in 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 <br />the shallow alluvial wells near the White River and, after treatment, is stored in the potable water <br />storage tank. The quality of water from these wells is such that chlorination and a reverse osmosis <br />plant are required to meet State Board of Health requirements. Water is taken from the raw water <br />tank, treated, and then stored in the potable water storage tank. The size of the storage tank is <br /> <br />