INSPEC41535 - Laserfiche WebLink

Home Browse Search

Colowyo Mine, p~. 2 Stop at powder magazines which are fenced, orderly, and well protected. Stop at the new potable groundwater well being developed on the main mine facilities area adjacent to the existing water tanks, and we discussed the on-going coordination with the State Engineer's Office for final development and operation of this well. Facilities pond 2A and 2B were inspected next, was not discharging, and appears to be well maintained and stable. We inspected the sediment cells just adjacent to the wash bay area that had been maintained recently and were functioning, oil & grease booms are utilized at the first sed. pond cell here and they were functioning. The sewage treatment lagoon also in this area appeared stable. We inspected recent road culvert clean-out and maintenance work completed on the main haul road. Mr. Walker and Colowyo have developed maintenance criteria to help determine when various sized culverts need sediment removal. Culvert M needs to be cleaned again, due to recent heavy surface water runoff and snow melt. Stop at the scoria pit where the approved ASCA here is functioning, and the access road water bar has recently been rebuilt. East Taylor sediment pond was inspected, is stable, and had 1 to 2 feet of storage capacity remaining. This pond has not discharged in some time according to inspection participants as Colowyo has been managing surface water runoff in the active pit areas wherever possible. West Pit sediment pond (below the West Pit excess spoil fill) was abnost completely dry. The K culvert on the main haulroad also needs to be cleaned out again due to recent runoff. We inspected the unit train loadout area, and the Gossard loadout pond. Both sediment ponds here were just cleaned out, and were not discharging during the inspection. Pond cleanings need to be removed from the site. The stoker siding pond here had additional storage capacity and appeared stable. Topsoil stockpiles in this area were marked, protected, and stable. Culvert N was inspected and was clear due to recent maintenance. This concluded the inspection on Oct. 25. On October 26, Mr. Walker began the inspection at the East Taylor pump pond (water impoundment used primarily for dust suppression water) which is stable. Next stop at the Prospect Pond where we observed a sizeable sediment delta reportedly due to intense July and August 2004 rain events in this watershed, It will be cleaned out this Fall 2004. Checked the seismograph at the Durham Ranch (used to monitor blasting in the East Pit where there currently is no blasting occurring as overburden and coal removal is completed and only highwall mining remains).