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III IIIIIIIIIIIIIIII Doc Date:12/11/2001 ,n. .~: s gFCF1~F0 • SECOND HALF 1994 SUBSIDENCE SURVEY REPORT ~4/Q of v~~~~0~'i,%nea2o 1995 I. Survey Data s~ Leo/p9y During the second half of 1994, subsidence survey data was collected on a quarterly basis from established monuments on Routt County Road 27 in those areas underlain by gate roads or panel centers (refer to Figure I for monument locations). Table 1 provides a summary of the collected data for stations R1- R6 located over the gate roads at the west end of the 1 Southwest Longwell panel, for station R7 situated over the center of the 1 Southwest Longwell panel, and for stations R8-RI S located over the gate roads on the south side of the 1 Southwest Longwell panel. In addition, the pre-mining survey information for the 5000 line consisting of six points established to verify that subsidence resulting from the mining of the 2 Southwest Longwell panel does not extend into the Fish Creek AVF was collected during the period. This information is also provided in Table 1. The 5000 line survey monument locations are depicted on Map 23A. II. Maps • Monument locations are depicted on Figure 1 and Map 23A. The extent of underground workings during the period is presented as the Twentymile Coal Company - Foide] Creek Mine monthly update map for the period ending 12/31/94. The 1 Southwest Longwell panel was initiated in July and completed in December. The 2 Southwest Longwell panel was initiated in December as shown on the monthly update map. Approximately 6500 feet of the 2 Southwest Longwell panel is projected to be completed during the first half of 1995 as indicated on the monthly update map. County Road 27 and the YVEA power line undermined during the reporting period are shown on Figure l . Surface topography is presented on Map 23A. No cross section information was generated during the period. III. Structures Structures affected during the period include Routt County Road 27 and the YVEA power line. Daily visual inspections of County Road 27 were initiated 7/14/94 and continued through November 11/21/94. Selected inspection sheets are included in this report. With the exception of [he initial form completed, only those sheets showing other than no impact observations are included. All daily inspection fornis are available for review at the mine office. No significant road damage requiring immediate repair was evidenced during the subsidence process though minor deterioration was noted. The • YVEA power line was visually inspected on a periodic basis with no impacts evident during the period.