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FIRST HALF 2003 SUBSIDENCE SURVEY REPORT <br />I. Survey Data• <br />During the first half of 2003, Twentymile's longwall did not directly undermine the <br />Union Pacific railroad, Walcott, Hayden-Gore Pass and Western Area Power <br />Administration power lines, or the Foidel Creek. On January 15, 2003, post-mining <br />survey data was collected from established monuments on the Union Pacific Railroad in <br />aeeas underlain by gate roads or panel centers in the 14-Right (Panel No. 14) longwall <br />panel. The data and frequency for the survey monuments along the Union Pacific <br />Railroad aze presented in the attached Table No. 1. <br />Portions of the Fish Creek were undermined by the 14 Right Pane] during the first half of <br />2003. The post mining survey of Fish Creek in areas underlain by the 14 Right gate road <br />or panel center is in process and will be completed late this summer. The subsidence <br />profile for Fish Creek over Panel 14 Right will therefore be submitted with the second <br />half 2003-subsidence report. <br />II. Structures: <br />Structures remained essentially unaffected during the period with the exception of the <br />predicted impacts to the Union Pacific Railroad and Fish Creek. No adverse impacts, i.e. <br />imminent failure of structure, were evident with regard to these structures. <br />As noted above, one post-mining survey of the Union Pacific Railroad was conducted on <br />January 15, 2003. A report on this survey data was submitted to various personnel from <br />the UPRR. Any final re-leveling of the rail line to the post-mining target level will be <br />performed by the UPRR as needed. A follow-up survey will be performed after <br />releveling is performed. A final report will be submitted to the UPRR subsequent to <br />these surveys. <br />No other repair work was required to the Union Pacific Railroad as a result of TCC's <br />mining activity. <br />III. Man: <br />The monitoring locations for the first half of 2003 are shown on the First Half of 2003, <br />Subsidence Map. The map also indicates the location of the longwall face on a monthly <br />basis. <br />IV. Hydrolo¢ic Monitorine: <br />The 14 Right Panel has two alluvial wells and two surface sites associated with it. The <br />sites are shown on the attached First Half of 2003 Subsidence Map. The upstream alluvial <br />2003_1stHalfSubReport.doc Page 1 of 2 10/08/03 <br />