2018-08-08_PERMIT FILE - C1982056A (4)

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The factors considered in the design of the drainage control and treatment plan are discussed in Exhibit 8, Sediment Control Plan and the various modifications presented in Exhibit 8. Initially the mine plan called for coal produced from the underground mine to be hauled to the Fish Creek Tipple. Drainage control and treatment for the tipple facilities are described in detail in the permit application C-036-81 for the Fish Creek Tipple, dated March 1984. This permit has subsequently been incorporated into permit C-82-056. The coal is now loaded through the tipple near the Foidel Creek Mine portal. While TCC intends to continue this practice, the Fish Creek Tipple can be reactivated if needed. The surface and ground water drainage control plan and discussions of probable hydrologic consequences for the Fish Creek Tipple/Loadout operation are found in the Fish Creek Tipple/Loadout Appendix, Volume VII, pages 2.05-77 through 2.05-90. The sediment control plan is presented on Map 5, Fish Creek Tipple Hydrology. The hydrologic monitoring plan is described on pages 2.05-82 through 2.05-84 of the same volume. (ii) A plan for treatment where required by these Rules and for surface and ground water drainage from the area to be affected by proposed activities and proposed quantitative limits on Pollutants in discharges subject to State and Federal laws. Except for the Site 115 discharge discussed below, all surface water discharge with treatment systems use sediment ponds to provide treatment. All sediment ponds are designed to meet the requirements of their respective permits. Effluent limitations for discharges from sedimentation control and mine discharge structures are specified in one of three NPDES Permits: CO-0027154, CO-0036684, or CO-0042161, Table 9-l(Summary of Effluent Limitations, Normal Conditions). The NPDES Permits are located in Exhibit 30 (Volume 11I). In addition to surface runoff, Pond D will control water pumped from the underground workings through a system of sumps and pump stations. Effluent from the underground mine will be pumped through a borehole at Site 109 and then piped to Pond D, or alternatively to Site 114. Effluent will meet the water quality requirements of NPDES Permit CO-0027154 before being released from Pond D. Tile water will then drain through a culvert under Haulroad B that discharges into Foidel Creek. Effluent from the underground mine can also be discharged from the Fish Creek boreholes. The boreholes are approximately 1,100 feet deep and penetrate the mine workings at the West End of the 6 Left Entry. Each pump is capable of pumping 200 to 600 gpm and can be pumped individually or together for a combined rate of 1,200 gpm. Presently, June 1999, the pump can discharge at a rate of approximately 370 gpm, for a combined total of 740 gpm. The water discharges into the FCB treatment facility, where it can be treated with sodium hydroxide to reduce the total recoverable iron concentration. The water then passes through the facility before discharging at Site 115. Effluent will meet the water quality requirements of NPDES Permit CO-0042161 before being released. (iii) A determination of the probable hydrologic consequences of the proposed surface coal mining activities or underground mining activities on the proposed permit area and adjacent area with respect to hydrologic regime and the quantity and quality of water in surface and ground water systems under all seasonal conditions as determined by base I i nehydrologic and geologic data collected from, or statistically representative of, the site The probable ldrologic consequences will identify adverse impacts which may occur to the hydrologic balance including: impacts from acid or toxic-forming_materials,• whether the operation would interrupt diminish or contaminate water Sources*, the effect the operation would have on concentrations of total dissolved and total Suspended solids total iron pH total manganese and other parameters required by the Division. PROBABLE HYDROLOGIC CONSEQUENCES Evaluation of the Probable Hydrologic Consequences (PHC) of the proposed mining and related activities encompasses a number of specific areas: RN 17-07 2.05-131 02/15/18