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Introduction <br />This report is for period from January 2006 through June 2006. Mine Construction of <br />the Bowie No. 2 Mine began during May of 1997, with coal production beginning during <br />August 1997. <br />The mining permit application for the Bowie No. 2 Mine requires the operator to submit <br />the results of the subsidence monitoring programs and the results of the visual <br />inspections of known modern and historic landslides within the permit and adjacent <br />area for stability in June and December of each year and report these results to the <br />Division within 30 days of the ends of the reporting periods. <br />The operator is also required to inspect these landslides, both modern and historic <br />monthly for six months immediately after retreat mining occurs. This same inspection <br />routine is applied to any spring or pond in the immediate proximity of retreat mining. <br />Longwall mining during the period included completion mining in the 61 and B-2 panels. <br />Visual Inspection of known historic and modern landslides. <br />A visual inspection of all known historic and modern landslides was conducted during <br />May 2006 by Brad Lindsay, RL Rock Logic Consulting LLC. Mr. Lindsay's report is <br />attached. <br />Increased Inspection activity associated with retreat mining. <br />Accessible subsidence cracks are repaired during coal exploration events and are <br />monitored by both coal exploration supervisors and hydrologic monitoring technicians. <br />The accessible visual results of the subsidence effects associated with the Bowie No. 2 <br />Mine are overlain on Map 27 - C Subsidence Features. Map 27-C is enclosed. During <br />this period, no hydrologic monitoring points were impacted or re-impacted by mining <br />activities. Potentially impacted or re-impacted means the mine workings or angle of <br />draw of the mine workings passed under the monitoring point during the reporting <br />period. No influence to any hydrologic monitoring points was observed during this <br />period. <br />Results of Subsidence Survey Monitoring <br />The results of the May 10, 200 monitoring are attached. As in the past, the survey was <br />performed by Cragg Surveying using GPS methods. <br />Analysis of Subsidence Data <br />The following table presents an analysis of the subsidence survey data. Panel 61 was <br />complete and panel B-2 had advanced about 4700' at the time the survey was <br />performed. Following is a summary of the survey data collected during the period. <br />There was no activity near Hubbard Creek or Dove Gulch. The survey data presents <br />the subsidence over the west D-Seam longwall panels after all three panels were <br />complete and the subsidence attributable to panels B-1 and approximately 4,000 feet of <br />panel B-2. <br />