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WASTEWATER TREATMENT <br />Approval to construct a wastewater treatment facility was attained from the various regulatory agencies in 1982. The <br />construction of the facility was completed in late 1982. The main component of the treatment facility is the aerated <br />lagoon, comprised of two cells, and the polishing pond. Other components include oil water separator, sewer lines <br />from the bathhouse, shop, and laboratory, a lift station, and a discharge ditch. The discharge flows into the Williams <br />Fork River and is in compliance with the NPDES permit. The wastewater treatment facility is located to the southeast <br />of the shop between the railroad spur and the Williams Fork River. <br />MINE WATER HANDLING SYSTEM <br />The mine water handling system is located to the north of the office and shop facilities. The mine water system is <br />used to settle solids before the water is discharged into the Williams Fork River. The system has been designed to <br />handle all water that was pumped from the No. 5 mine and all water that pumped from the No. 6 mine. A detailed <br />description of the system follows. <br />Back rg ound - It was originally planned to drill two boreholes (approximately 20 inches in diameter) from the hillside <br />adjacent to the planned pond location into a low area of the mined-out section of the No. 5 mine. However, due to the <br />amount of water encountered in one of the boreholes (approximately 400gpm), this location was abandoned. The <br />borehole, which encountered water, is now being used as a ground water monitoring well for the Middle Sandstone. <br />The other borehole has been sealed. <br />New borehole locations were selected and approved by the MLRD in November, 1982. They are located in the <br />Williams Fork River Valley. Refer to the Structures and Renewable Resources Map (Map 25) for locations. <br />System Description <br />I* The mine water handling system consists of the following major components: <br />• No. 5 Mine Sump <br />• Boreholes and Overland Pipes <br />• Chemical Treatment System <br />• Settling Ponds <br />• Discharge Ditch <br />All major components of the system are shown on the Structures and Renewable Resources map (Map 25) <br />No. 5 Mine Sumo - The No. 5 Mine sump is located in the structurally lowest portion of the No. 5 Mine. All water <br />encountered in the No. 5 Mine is routed to the sump. Boreholes were drilled from the No. 5 Mine to the No. 6 Mine <br />to allow the pumping of water encountered in the No. 6 Mine to the No. 5 Mine Sump. The locations of these holes <br />depend upon water volumes encountered. <br />Boreholes and Overland Pipes - Water from the No. 5 Mine sump is pumped to the surface via two (2) 20 inch <br />boreholes. The boreholes were drilled vertically from the Williams Fork River valley approximately 520 feet to the <br />No. 5 Mine sump. It was anticipated that a chemical treatment system would be needed to treat the mine water <br />discharge but experience has shown this system is not required. <br />Chemical Treatment System - Presently, there is no chemical treatment system but if conditions change, one may be <br />brought into service. <br />Settlin Ponds onds - A series of three (3) ponds have been constructed on the Williams Fork River floodplain to settle out <br />suspended solids from the raw mine water. Each pond has a capacity of 60,000 cu-ft, which translates into a three (3) <br />hour retention time per pond at design capacity. Based on the system design, only two (2) of the three (3) ponds are in <br />Permit Renewal RN08-05 2.05-12 01/15/09