2021-08-06_PERMIT FILE - C1982056A (2)

Home Browse Search

Species PLS lbs./acre Intermediate wheatgrass 2.0 Slender wheatgrass 2.0 Pubescent wheatgrass 2.0 Desert Wheatgrass 1.5 Regar meadow brome 0.5 Lincoln smooth brome 1.0 Orchardgrass 0.5 Timothy 0.5 Alfalfa 0.25 Cicer milkvetch 0.25 10.5 Monitoring and Water-Supply Wells and Utility Boreholes In general, groundwater monitoring wells are retained and monitored until it is determined that monitoring is no longer necessary. Similarly, utility boreholes are retained until they are no longer needed. At that time, groundwater monitoring wells and utility boreholes are reclaimed in essentially the same manner as previously described for exploration boreholes. The primary differences in reclamation requirements for monitoring wells/utility boreholes versus exploration boreholes are that monitoring wells/utility boreholes may require a bottom plug to facilitate proper sealing and much of the surface reclamation (ie: site grading, topsoiling, and seeding) for monitoring wells/utility boreholes has already been completed, since these sites are stabilized at the time the well/borehole is completed. Typically, an inflatable packer, spider, or other plug is used as the base for the grout column to properly seal monitoring wells/utility boreholes. Perforation of the well casing is not necessary since casings are normally grouted in-place during well construction. Final reclamation of these sites (ie: plugging and sealing)may result in minor re-disturbance, but does not typically require full reclamation. Because alluvial monitoring wells are relatively shallow wells completed in unconsolidated alluvium/colluvium, which do not penetrate other potential water-bearing units, well abandonment is simplified. Typically, well abandonment for shallow alluvial wells involves either pulling or cutting the well casing off at least a foot below grade, backfilling the well bore with native soil materials, and placing a permanent marker to identify the former well location. Any associated surface disturbance is then reclaimed in the manner previously described. Water- supply wells are a valuable asset that is typically retained to support postmining land uses. If this is not the case, they are also plugged, sealed, and reclaimed, as previously described. Dedicated light-use roads or pre-existing County or ranch roads may be used to access monitoring and water-supply wells and utility boreholes for final reclamation. (h) A description of steps to be taken to comply with the requirements of the Clean Air Act (42 U.S.C. Sec. 7401 et seg.), the Clean Water Act (33 U.S.C. Sec. 1252 et seq.), and other applicable air and water quality laws and regulations and health and safety standards, or a copy of an approved permit or application for a permit. RESPONSE TC will continue to operate in accordance with air quality emission permits issued by CDPHE-APCD. Fugitive dust control measures are employed as an integral part of the mining and reclamation operations. Compliance with the air quality permits serves to effect compliance with the Federal Clean Air Act and the Colorado Air Quality Control Act. Air pollution control measures are discussed in greater detail under Rule 2.05.6(1), and copies of the Air Quality Emission Permits issued for the Foidel Creek Mine are presented in Exhibit 29, Emission Permits. TC will maintain compliance with applicable provisions of National Pollutant Discharge Elimination System (NPDES)/Colorado Discharge Permitting System (CDPSD) Permits CO-0027154, CO-0036684, CO-0042161, COG-8500051/54, COR-040126, and COR-031`087. The dewatering facility permit, issued in July of 1989, establishes effluent limitations for mine discharge only, surface flow does not enter the impoundment structure. TR16-84 2.05-121 06/20/16