Laserfiche WebLink
Species <br />PLS lbs. /acre <br />Intermediate wheatgrass <br />2.0 <br />Slender wheatgrass <br />2.0 <br />— Pubescent wheatgrass <br />10 <br />• Desert Wheatgrass <br />1.5 <br />Regar meadow brome <br />0.5 <br />— Lincoln smooth brome <br />1.0 <br />Orchardgrass <br />0.5 <br />Timothy <br />0.5 <br />Alfalfa <br />0.25 <br />Cicer milkvetch <br />0.25 <br />10.5 <br />Coordinates of the borehole are established by survey or GPS and recorded for location purposes. Finally, an <br />abandonment report is prepared, with copies submitted to the CDMG. <br />Monitoring and Water - Supply Wells and Utility Boreholes <br />In general, groundwater monitoring wells are retained and monitored until it is determined that monitoring is no <br />longer necessary. Similarly, utility boreholes are retained until they are no longer needed. At that time, <br />groundwater monitoring wells and utility boreholes are reclaimed in essentially the same manner as previously <br />described for exploration boreholes. The primary differences in reclamation requirements for monitoring <br />wells /utility boreholes versus exploration boreholes are that monitoring wells /utility boreholes may require a <br />bottom plug to facilitate proper sealing and much of the surface reclamation (ie: site grading, topsoiling, and <br />seeding) for monitoring wells /utility boreholes has already been completed, since these sites are stabilized at the <br />time the well/borehole is completed. Typically, an inflatable packer, spider, or other plug is used as the base for the <br />grout column to properly seal monitoring wells /utility boreholes. Perforation of the well casing is not necessary <br />since casings are normally grouted in -place during well construction. Final reclamation of these sites (ie: plugging <br />• and sealing) may result in minor re- disturbance, but does not typically require full reclamation. <br />Because alluvial monitoring wells are relatively shallow wells completed in unconsolidated alluvium/colluvium, <br />which do not penetrate other potential water - bearing units, well abandonment is simplified. Typically, well <br />abandonment for shallow alluvial wells involves either pulling or cutting the well casing off at least a foot below <br />grade, backfilling the well bore with native soil materials, and placing a permanent marker to identify the former <br />well location. Any associated surface disturbance is then reclaimed in the manner previously described. <br />Water - supply wells are a valuable asset that is typically retained to support postmining land uses. If this is not the <br />case, they are also plugged, sealed, and reclaimed, as previously described. <br />(h) A description of steps to be taken to comply with the requirements of the Clean Air <br />Act (42 U.S.C. Sec. 7401 et seg.). the Clean Water Act (33 U.S.C. Sec. 1252 et sen.), and other applicable air and <br />water quality laws and regulations and health and safety standards, or a copy of an approved permit or application <br />for a permit. <br />RESPONSE <br />TCC will continue to operate in accordance with air quality emission permits issued by CDPHE -APCD. Fugitive <br />dust control measures are employed as an integral part of the mining and reclamation operations. Compliance with <br />the air quality permits serves to effect compliance with the Federal Clean Air Act and the Colorado Air Quality <br />Control Act. Air pollution control measures are discussed in greater detail under Rule 2.05.6(1), and a copy of the <br />Air Quality Emission Permits issued for the Foidel Creek Mine are presented in Exhibit 29, Emission Permits. <br />• TCC will abide by the requirements of National Pollutant Discharge Elimination System ( NPDES) Permit CO- <br />0027154 issued by CDPHE -WQCD. Twentymile Coal Company is responsible for NPDES Permits No. CO- <br />0036684 and CO- 0042161. Permit No. CO- 0036684 establishes the effluent limitations for the Fish Creek Tipple. <br />TR05 -51 2.05 -121 03/13/06 <br />