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September 23, 2015 C-1981-022/Elk Creek Mine LDS <br />OFFSITE SUPPORT FACILIITES - Rule 4.04,4.28: <br />Several de -gas boreholes were inspected. <br />• DW2 had recently been plugged and sealed, although the concrete appeared to have settled below grade <br />and needed to be topped off. <br />• The Himes drill rig was positioned at the TGA hole (which is sited approximately above the final resting <br />place of the longwall miner, and was used to sample air from the mine workings at the time of the mine <br />fire). Himes were set up to pull the pipe from the hole before plugging and sealing. <br />• Two of the Himes contractors were working to plug and seal the HGA hole during the inspection. They <br />were using a standard Halliburton rubber plug, which was pushed —60 feet below the ground surface and <br />set with two 801b bags of ready mix concrete. They planned to return the following day and fill the hole to <br />the surface with more ready mix concrete. <br />DOCUMENTS RECEIVED <br />West Valley Fill Firefighting Plan, (see Appendix A). <br />OTHER (SPECIFY) <br />n/a <br />ENFORCEMENT ACTIONS/COMPLIANCE <br />No enforcement actions were initiated as a result of this inspection, nor are any pending. <br />Number of Partial Inspection this Fiscal Year: 2 <br />Number of Complete Inspections this Fiscal Year: 1 <br />Page 4 of 13 <br />