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I ~ Introduction <br />This report covers the period from July 2004 through December 2004. Mine <br />Construction of the Bowie No. 2 Mine began during May of 1997, with coal production <br />beginning during 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 modem 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 mining and completing the WD2 <br />panel and beginning the WD3 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 />May and June 2004 by J, E. Stover, 2768 Compass Drive, Suite 101, Grand Junction, <br />CO 81506. 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 />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 - B Subsidence Monitoring. Map 27-B is not enclosed <br />since there are no new subsidence features to depict. During this period, 1 hydrologic <br />monitoring point, S-10, was potentially impacted or re-impacted by mining activities. <br />Potentially impacted or re-impacted means the mine workings or angle of draw of the <br />mine workings passed under the monitoring point during the reporting period. No <br />influence to any of these hydrologic monitoring points were observed during this period. <br />Results of Subsidence Survey Monitoring <br />The results of the May and June 2004 monitoring are attached. As in the past, the <br />survey was performed by Cragg Surveying using GPS methods. A Subsidence <br />Features map which shows subsidence cracks identified during 2004 is included with <br />this report. <br />Analysis of Subsidence Data <br />The following table presents an analysis of the subsidence survey data. The activity <br />