PERMFILE113218 - Laserfiche WebLink

Home Browse Search

previously reported for the Fish Creek Borehole. TCC will continue to monitor the concentration, and anticipates the concentration to return to historic levels by late summer, 2004. • In regards to future impacts, TCC will not discontinue pumping of the underground sump for the extended periods of time. This will eliminate the potential for the above situation to occur in the future. Once mining is completed at the facility, no further dischazging will occur. Based upon this, there should be no impact to the postmining land use. NMD (Panels 17 Right through 2~Right)(PR 03-06) The geology description provided in PR-03 can be applied to the description for the NMD. One item to note is that TCC discontinued pumping from the Fish Creek Borehole for a period of approximately 18 months. When pumping commenced the total recoverable iron and total dissolved solids concentrations increased to approximately 17 mg/1 and 7200 mg/1 respectively. TCC is applying caustic soda to reduce the total recoverable iron concentration as is per its CDPHE discharge permit. TCC believes the elevated concentrations are the results of the water stagnating in the underground sump. Once this pool of water is discharged, TCC believes the concentration will return to levels previously reported for the Fish Creek Borehole. TCC will continue to monitor the concentration, and anticipates the concentration to return to historic levels by late summer, 2004. In regards to future impacts, TCC will not discontinue pumping of the underground sump for the extended periods of time. The water from this sump is now part of a recirculation system that will ensure that water is continually pumped from the sump unless operational requirements dictate otherwise. This will eliminate the potential for the above situation to occur in the future. Once mining is completed at the facility, no further discharging will occur. Based upon this, there should be no impact to the postmining land use. (91 Return of Coal Mine Waste to Abandoned Workings • (a) Each plan shall describe the desi ng_, operation and maintenance of any proposed coal processing mine waste disposal facility, including flow diagrams and any other necessary drawings and maps, which must meet the standards of 2.10, for the approval of both the Division and the Mine Safetv and Health Administration in accordance with 4.11.3. (b) Each plan shall describe the source and quality of waste to be stored, azea to be backfilled, percent of the mine void to be filled, method of constructing_under¢round retaining walls, influence of the backfilling operation on active underground mine operations, surface area to be supported by the backfill, and the anticipated occurrence of surface effects following backfillin~. (c) The applicant shall describe the source of hydraulic transport medium, method of dewatering the placed backfill, retainment of water underground, treatment of water if released to surface streams, and the effect on the hydrologic regime. (d) The plan shall describe each permanent monitoring well to be located in the backfilled area, the stratum under[ying the mined coal, and gradient from the backfilled area. (e) The requirements of 2.05.3 shall also apply to pneumatic backfilling operations, except where the operations are exempted by the Division from requirements specifying hydrologic monitoring. RESPONSE • TCC is planning on returning the thickener underflow generated at the Prep Plant to the abandoned workings located in the Eastern Mining District. The location of the azea to receive the underflow is shown on Map 23. In the plant the thickener underflow goes to a filter press for dewatering, and then this material is combined with the course refuse and hauled to the refuse pile for placement. It is TCC's intent PR 03-06 2.05-97.1 05/07/03