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• Introduction <br />This report is for period from July 2005 through December 2005. 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 modem 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 of the B-1 panel and mining in <br />the B-2 panel. <br />Visual Inspection of known historic and modern landslides. <br />A visual inspection of all known historic and modem landslides was conducted during <br />August and October 2005 by J. E. Stover, 2352 North 7"' Street, Grand Junction, CO <br />81501. No new or rejuvenated landslides were found during this inspection. These <br />• sites are also regularly inspected by Bowie personnel during gob vent borehole <br />construction and reclamation efforts. <br />Increased Inspection activity associated with retreat mining. <br />During this period, Spring 10 was potentially 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 August and October 2005 monitoring are attached. Subsidence <br />monuments along Hubbard Creek were surveyed on August 2"d and October 18"'. <br />Subsidence monuments above the west longwall panels were surveyed during October <br />18~'. As in the past, the survey was pertormed by Cragg Surveying using GPS methods. <br />Subsidence Crack Mapping <br />A Subsidence Features map which shows subsidence cracks identified during 2005 is <br />included with this report. Also enclosed is a 2005 Subsidence Crack Mapping Report <br />prepared by Brad Lindsay. Accessible subsidence cracks are repaired during coal <br />exploration events and are monitored by both coal exploration supervisors and <br />hydrologic monitoring technicians. <br />r1 <br />LJ <br />