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TEL No. <br />0, 0 112 P.03 <br />Memo to Janet Binns <br />Twenty Mile Coal Company 1997 Subsidence Reports <br />page 2 <br />acceptance as submitted. The Second-Half report lacks the visual <br />monitoring report sheets for Routt County Road #33, the Union Pacific <br />track, and the two power lines. Perhaps you failed to forward these to my <br />attention. If not submitted by Twenty Mile Coal Company, they should be <br />provided for file completeness. <br />Figure #1 within the Second-Half report presents the map and profile of <br />Foidel Creek above Panel 8 Right. The profile section presents profile <br />lines titled "Pre-mining Profile", "9-11-96", and "11-97". In the <br />vicinity of station 255+00 on Foidel Creek subsidence apparently created <br />an impoundment, labeled "Foidel Creek Pond, Nov. 14, 1 996, area = 34,214 <br />sq. Ft." on the map. The enlarged profile suggests that the impoundment <br />existed when profiled in November of 1996, but not pre-mining nor post <br />subsidence in November of i 997. No discussion is provided regarding this <br />surface hydrology detail within the text of the subsidence report. This <br />could be a significant topic of interest. Is a discussion provided anywhere <br />else, such as in the Annual Hydrology Report? Was the pond formed solely <br />by subsidence troughing? Was it subsequent breached by natural <br />phenomena or artificially eliminated? This topic should be thoroughly <br />described somewhere within the various monitoring reports provided by <br />Twenty Mile Coal Company. <br />Finally, within the Second-Half report, Mr. Mills states that "Limited <br />darnaye occurred to the liayden -Gore Pass structure (power line pole or <br />poles%), however, utility representatives inspected the structure and <br />indicated any repair work can be done during the summer of 1998." <br />l wenty Mile Coal Company should provide a more detailed description of <br />the damage and the affected repairs in subsequent 1998 reports. <br />Uoc: M:\COAL\JAP\TMCSUB97.WPD <br />JV/jp <br />