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RULE 4 PERFORMANCE STANDARDS <br />Map (Map 12) and the Hydrology - North Map (Map 11), and discussed in detail under Section 2.05.6. <br />Their design is specified in Exhibit 7, Hydrological Information. <br />No acid-forming materials are present in the area to be mined which would require selective placement <br />and sealing of overburden. The chemical characteristics of the overburden is presented under Section <br />2.04.6. The overburden sampling program is presented under Section 2.05. Results of the current <br />overburden sampling program are presented in the Annual Reclamation and Hydrology Reports beginning <br />in 1983 to the present. <br />As discussed in Section 2.05.4, Colowyo will use various surface manipulation techniques on the topsoil <br />after its redistribution as one method to prevent excessive wind or water erosion. <br />No special treatment of coal processing waste is necessary since none will be produced. See Section 4.10 <br />and 4.11. <br />With a few exceptions, Colowyo plans to have all surface runoff from the disturbed area pass through <br />sedimentation ponds. Sedimentation ponds are discussed in detail under Section 4.05.6, and their location <br />is shown graphically on the Hydrology - South Map (Map 12) and the Hydrology - North Map (Map 11). <br />Exceptions include such areas as topsoil stockpiles located outside of the Section 11 ditch, topsoil <br />stockpiles located along the paved haul road, East Taylor holding pond and pump station, raw and potable <br />water lines, and railroad loop. Erosion and sediment control is achieved by protection with vegetation or <br />rock. <br />The Administration and Security buildings have associated paved parking areas which generate no <br />sediment. <br />Colowyo employs various methods to manage water which periodically collects internal to the mining <br />operation and does not reach sedimentation ponds. various sumps, ditches, pumps, hoses and pipes, etc. <br />will be employed to control water within pits and/or route water between pits. The ultimate destination of <br />such water will be for operation's use (dust control, etc.), evaporation or seepage into the backfilled spoil <br />areas. <br />In addition to the mining, reclamation and treatment methods described and referenced in this Section, <br />further protection of the hydrologic balance will be established by an on-going plan for monitoring <br />potential changes in surface water quality and quantity and groundwater quality. This monitoring plan is <br />described under Section 4.0-5.13 and the monitoring locations are graphically shown on Map l OB. Excess <br />spoil valley fill areas are located down -dip of mining and reclamation areas and periodic monitoring for <br />seeps and springs and periodic monitoring of piezometer wells will detect the formation of spoil springs. <br />4.05.2 Water Quality Standards and Effluent Limitations <br />The plan for protection and control of drainage and sediment described in 2.05.6 provides that surface <br />drainage from the disturbed area within the permit area will be passed through sedimentation control <br />structures. All ponds will be constructed and maintained to contain or treat the volume design for a 10 - <br />year, 24-hour precipitation event. The accumulation of sediment in the ponds will be monitored quarterly. <br />In addition, grab samples of water, as required, will be collected from pond discharges to measure the <br />effectiveness in meeting the applicable Colorado and Federal water quality standards. <br />Drainage from the mining area, after treatment in sedimentation ponds, is not anticipated to exceed the <br />effluent limitations of any federal or Colorado agency requirements. Baseline groundwater quality is <br />Rule 4 Performance Standards 4-7 Revision Date: 1/31/18 <br />Revision No.: TR -119 <br />