2022-12-30_GENERAL DOCUMENTS - C1981010

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solids from the fill would be a local impact, it does not rise to the level of material damage because use or potential use is not likely to be impaired. An exceedance of an instream standard in Horse Gulch is unlikely because leachate from the fill will probably be alkaline (like all other Trapper leachates) and is not likely to contain high concentrations of the inorganic or metals constituents for which there are numeric standards in Horse Gulch. Ground Water Impacts The 2021 Annual Hydrology Report(AHR), Section 2.5 of the permit presents the most current information regarding springs and seeps at TMI. Appendix B presents ground water quality data from 2012 through 2021. Flow from the springs and seeps is shown on Table B-2. A CD submitted with the AHR provides all historical data. The NPDES permit#CO-0032115 issued by the Colorado Department of Public Health and Environment describes water quality monitoring requirements. Pit dewatering occurs in L, N Pits, and well dewatering in the G Pit wells. All pit water is routed to NPDES drainage systems with discharges monitored at the approved outfall. Dust suppression for the main haul road consumes most of the water yielded from dewatering activities. Currently a number of the listed outfalls encompass Phase III bond released areas and therefore are no longer subject to DRMS monitoring requirements. IV. Topsoil Soil information can be found in Section 2.6, Volume II and Section 4.9, Vol. IV of the PAP. The Division previously granted a variance from topsoil removal in accordance with Rule 4.06.2(2)(a). Specific areas which the operator will not strip topsoil are limited to rocky areas which occur over limited areas throughout the mine area. Each area approved is handled separately as a minor revision to the permit and no general variance is currently approved. V. Sealing of Drilled Holes and Underground Openings Sealing of wells, holes, and other openings is discussed in permit Section 3.3, Vol. III. The Division requires each hole, well or other underground opening be capped, sealed, backfilled or otherwise managed as per Rule 4.07.3. VI. Use of Explosives The blasting plan, as well as other items related to blasting, are discussed in permit Section 3.4, Vol. III. The Division approved blasting at times other than those described in the blasting schedule due to unavoidable hazardous situations. These situations include elimination of misfires, adverse weather, equipment failure, and safety related reasons (4.08.3(2)(b)(v) and (4.08.4(2)). VII. Disposal of Excess Spoil Permit section 3.5.3, Vol. III of the application discusses disposal of excess spoil. 18