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08/24/99 FIRST HALF 1999 SUBSIDENCE SURVEY REPORT Survey Data During the first half of 1999, subsidence survey data was collected periodically from established monuments on Routt County Road No. 33, the Hayden-Gore Pass, Wolcott Tap-Wolcott (PSC) and Western Area Power Administration power lines, two dwellings and Middle Creek in areas underlain by gate roads or panel centers during periods of mining in the 5 Right longwall panel. As is reflected in the data and on the attached subsidence map, the 5 Right longwall panel did not directly undermine the railroad and Foidel Creek during the first half of 1999. The data and frequency for the survey monuments along Routt County Road No. 33 are presented in the attached Table 1. The data and frequency for the survey monuments along the Wolcott Tap-Wolcott (PSC), Western Area Power Administration and Hayden-Gore Pass power aze presented in the attached Tables 2, 3 and 4. Middle Creek was surveyed in May 1999. A profile of the creek showing the subsidence effects due to the mining of the 5 Right longwall panel is attached as part of this report. II. Structures Structures affected during the first half 1999 reporting period include the Wolcott Tap- Wolcott (PSC), Western Area Power Administration and Hayden-Gore Pass power lines, Routt County Road No. 33, two dwellings and a small section of Middle Creek. Foidel Creek and the Union Pacific Railroad were not undermined during the first half of 1999. Visual inspections of the Vl'olcott Tap-Wolcott (PSC), Western Area Power Administration and Hayden-Gore Pass power lines were conducted concurrent with the surveys of the power poles from January 4, 1999 through June 26, 1999. No significant damage to the structures was noted during this period. No repair work was required as a result of TCC's mining activity. Visual inspections of Routt County Road No. 33 between monument 109 and 111 and the adjacent power line were conducted from Mazch 16, 1999 through May 23, 1999, 1999. Minor changes in the road shoulder of the eastern-most portion of this segment were first detected on Mazch 25, ]999 approximately 500' southwest of survey monument no. 109. No repair work was performed in this area. Additional minor changes in the road shoulder of the eastern-most portion of this segment were detected on March 29, ] 999 approximately 1000' southwest of survey monument no. 109. As noted on the Mazch through May 1999 inspection forms, other cracks on the shoulder and roadbed were 991stHalfSubReport.doc Page 1 oft