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• FIRST HALF 1996 SUBSIDENCE SURVEY REPORT Survey Data During the first half of 1996, subsidence survey data was collected periodically from established monuments on Routt County Road 27 (CR 27) and Routt County Road 33 (CR 33) in those areas underlain by gate roads or panel centers during periods of active mining (refer to the Monthly Mine Update Map for monument locations). Table I provides a swnmary of the collected data for stations R27 - R33 located on CR 27 over the end of the 3 Southwest longwall panel undermined in January 1996 and stations MONI - MON3 located on CR 33 over the gate roads and center of 9 Right longwall panel undermined in June 1996. II. Maps Monument locations and the extent and sequence of underground development during the period are presented on the Twentymile Coal Company - Foidel Creek Mine Monthly Update Map for the period ending June 31, 1996. The 3 Southwest longwall panel was initiated in July 199 and completed in February of 1996, as shown on the Monthly Update Map. Segments of Routt CR 27 and CR 33 undermined during the first half 1996 • reporting period are shown on the Monthly Update Map. Surface topography in the Eastern Mining District is presented on Map 23A -Sheet ? of 2. III. Structures Structures affected during the first half 1996 reporting period include CR 27, CR 33 and the Yampa Valley Electric Association (YVEA) power line. Daily visual inspections of CR 27 continued through 2/26/96. Daily visual inspections of CR 33 and the YVEA power line were initiated on 5/6/96 and continued tlvough 8/11/96. Selected inspection sheets from both roads and the power line are included in this report. With the exception of the initial form completed. only those sheets showing other than no additional impact observations are included. All daily inspection forms are available for review at the mine office. No road damage requiring immediate repair work was evidenced during the subsidence process although gravel additions and routine maintenance occurred to prevent rough driving surfaces. TCC will affect permanent repairs to CR 27 in cooperation with Routt County during 1996. The YVEA power line was visually inspected on a periodic basis with no impacts evident durring the period. Inspection of the power line was performed concurrently with the daily visual inspections performed on CR 33. •