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water to the surface facilities. A second centrifugal pump delivers water to the mine for dust control and fire protection. A second source is a water line which runs from a Colorado Yampa Coal Company manhole station 220 feet to a borehole approximately 170 feet deep, constructed of 4- inch PCV pipe, as shown on Map 24, Surface Facilities. This line will provide water to the TCC/CYCC water system. TCC proposes to install an additional waterline between CYCC and TCC. The line will be installed between CYCC's wash bay and TCC's pump house. The approximate location of the water line is shown on Map 24, Surface Facilities. A 40-foot corridor will be disturbed during installation. TCC is adding an 8-inch HDPE, 400-foot long waterline between Location 6 Inspection manhole and the freshwater borehole. A 40-foot comdor will be disturbed during installation. Mine Water Discharee Svstem Dischazge of mine water can occur at three stations, the Portal Borehole (Site 109) the Fish Creek Borehole (Site 115), and the EMD Dewatering Borehole. Water discharged from the portal site is channeled into Sedimentation Pond D or Sedimentation Pond F prior to joining Foidel Creek. Mine dischazge water from the Fish Creek Borehole is treated prior to entering Fish Creek. The treatment system for the EMD Dewatering system, as of 11\99, has not been constructed and the water is pumped back from this site back underground. In addition, there is a very limited potential for production mine water to discharge at the Northwest Mains Ventilation Shaft through a pressure relief/accmnulator pipe for the production mine water system. Although dischazge occurred in mid-2005 due to catastrophic failure of both the primary and back-up pressure relief valves, TCC has taken positive steps to assure that this site will not dischazge in the future. At the Fish Creek Borehole Area, water is channeled underground as shown on Map 16 (Mine Water Balance Map). Prior to entering the sump azea, the water passes through sflt collection rooms to allow some settling of material prior to the dischazge of mine water to the surface. At the Fish Creek Borehole, dischazge water is pumped up the 6-inch pipe to a buried 8-inch HDPE delivery line, which transports it to a distribution point. Here the flow is metered and can be regulated to discharge a desired quantity of water into the retention impoundment, and to return any excess flow into the mine through the 4-inch HDPE recirculation line that dischazges into the Fish Creek Vent Shaft. A portable structure has been located neaz the effluent of the delivery line to house reagent, injection pumps, and controls. Upon dischazge into the retention impoundment, the water is injected with reagents to begin the treatment process. The water is then circuited through the impoundment to assure adequate retention time before discharge. A second portable structure has been placed neaz the effluent of the impoundment and equipped to perform a final pH reduction when required. After treatment, water flows from the impoundment through a dischazge ditch to Fish Creek. TCC Proposes to upgade and expand the facilities at Fish Creek Borehole to improve its efficiency. This modification would include: • Installing a third portable structure for storing NaOH • Minor realignment of the access road into the facility and earthwork azound the Chemical • Storage Building to facilitate chemical deliveries • Installing remote monitoring equipment at sites on Fish Creek upstream and downstream of the Borehole discharge point • Installing poles to provide power and data lines to the remote monitoring stations MROS-194 2.05-50 07/2/05