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FIRST HALF 2006 SUBSIDENCE REPORT <br />I. Survev Data• <br />During the first half of 2006, mining began in the 19-Right longwall panel, which lies <br />beneath and parallel to two powerlines, owned by Western Area Power Administration <br />(WAPA) and Tri-State/Public Service Company of Colorado. Starting iti May, survey <br />data has been collected daily for the bases of each supporting power pole t as the longwall <br />continues to mine east to west. Surveying of the power poles will continue until the end <br />of the 19-Right Panel, and continued visual inspection will follow the completion of the <br />panel. <br />II. Structures- <br />As noted above, starting in May 2006, mining in the 19-Right Panel has subsided two <br />powerlines from the eastern-most power pole, 145-1. Daily surveys of the power poles <br />have been performed by Twentymile Coal Company personnel, and will continue to be <br />performed and reported to designated representatives for the owners of the powerlines. <br />Also, continued visual inspections of the subsided power poles will be performed daily by <br />Twentymile Coal Company personnel. <br />Structures remained essentially unaffected during the period, with the exception to the <br />predicted impacts to the power lines over the 19-Right longwall panel. <br />III. Maa: <br />The monitoring locations for the first-half of 2006 are displayed on the First Half 2006, <br />Subsidence Map. The map also indicates the location of the longwall face on a monthly <br />basis. <br />2006_1stHa1lSubReport.doc Page 1 of3 11/14/2006 <br />