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Introduction <br />This report is for the period from January 1, 2015 through June 30, 2015. 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 modern and historic landslides within the permit and adjacent area <br />for stability in June and December of each year and report these results to the Division <br />within 30 days of the end of the reporting period. <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 />During the reporting period, mining was completed in panel B -16. Panel B-1 7's <br />headgate and trailgate were completed during the period. Mining commenced in panel <br />B -17. Panel B -17 has advanced approximately 640 of the 2,500 foot long panel. <br />Development in the north mains continued during the period. The north mains have <br />been developed approximately 2,750 feet to date. <br />Visual Inspection of known historic and modern landslides. <br />A visual inspection of all known historic and modern landslides was conducted during <br />April 30, 2015 by Brad Lindsay, Rock Logic Consulting LLC. Mr. Lindsay's report is <br />attached. No new cracks were observed over Panel B -16. <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 />Pond and Spring 19 was potentially impacted by Panel B -16. Pond and Spring 5 -1 was <br />potentially impacted by Panel 17. Potentially impacted or re- impacted means the mine <br />workings or angle of draw of the mine workings passed under the monitoring point <br />during the reporting period. No influence to any hydrologic monitoring points was <br />observed during this period. <br />Results of Subsidence Survey Monitoring <br />The Pitkin Mesa Pipeline surveys were conducted in June. Monitoring points PL -11 and <br />PL -12 which are located over panel 15 showed some addition downward movement. <br />The Terror Creek and Terror Creek transmission line tower survey was performed June. <br />Monitoring results are attached. As in the past, the survey was performed by Cragg <br />Surveying using GPS methods. <br />-2- <br />