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<br />SECOND HALF 2002 SUBSIDENCE SURVEY REPORT <br />I. Survev Data: <br />During the second half of 2002, subsidence survey data was collected periodically from <br />established monuments on the Union Pacific Railroad and the YVEA power line in areas <br />underlain by gate roads or pane] centers during periods of mining in the 14-Right (Panel <br />No. 14) longwall panels. As is reflected in the data and on the attached subsidence map, <br />the 14-Right longwall panel did not directly undermine the Walcott, Hayden-Gore Pass <br />and Western Area Power Administration power lines, and Foidel Creek during the second <br />half of 2002. <br />The data and frequency for the survey monuments along the Union Pacific Railroad and <br />the YVEA power line are presented in the attached Table Nos. 1 and 2. The post mining <br />survey of Fish Creek in areas underlain by the 14 Right gate road or panel center will be <br />completed in the summer of 2003 as weather permits. The final subsidence profile for <br />Fish Creek over Panel 14 Right will be submitted with this first half 2003-subsidence <br />report. <br />II. Structures: <br />Structures affected during the second half of 2002 reporting period include the Union <br />Pacific Railroad and the YVEA power line. <br />Visual inspections of the Union Pacific Railroad and the YVEA power line were <br />conducted from October 10, 2002 through January 15, 2003. <br />Daily surveys and observations of the Union Pacific Railroad (UPRR) over Panel 14 <br />Right were performed from October 22, 2003 through January 15, 2003. A follow-up <br />report on the survey data and observations was submitted to various personnel from the <br />UPRR on a daily basis. Apre-miming "humping" of the railroad track with ballast was <br />performed in September 2002, prior to undermining of the track in October and <br />November 2002. Final re-leveling of the rail line to the post-mining target level will be <br />performed by the UPRR in the mid to late summer 2003 as needed. A follow-up survey <br />will be performed at that time. A final report will be submitted to the UPRR subsequent <br />to these surveys. <br />Several surveys and observations of the YVEA power line between October 10, 2002 and <br />November 16, 2002 did not indicate any noticeable change. No repair work was required <br />to this power line as a result of TCC's mining activity. <br />2002_2ndHalfSubReport Page t of 2 3/21/2003 <br />