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-2- <br />Introduction <br />This report is for the period from January 1, 2017 through June 30, 2017. Mine <br />Construction of the Bowie No. 2 Mine began during May of 1997, with coal production <br />beginning during August 1997. The Bowie No. 2 Mine temporarily ceased production of <br />coal effective February 26, 2016. <br /> <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 end of the reporting period. <br /> <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 /> <br />There was no mining during the reporting period. <br /> <br />Visual Inspection of known historic and modern landslides. <br />A visual inspection of all known historic and modern landslides was not conducted <br />during the reporting period because no mining occurred. <br /> <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 />No springs or ponds were potentially impacted during the reporting period because no <br />mining occurred. No influence to any hydrologic monitoring points was observed during <br />this period. <br /> <br />Results of Subsidence Survey Monitoring <br />The Pitkin Mesa Pipeline surveys were conducted in April and June. The Terror Creek <br />and Terror Creek transmission line tower survey was performed in May and June. <br />Monitoring results are attached. As in the past, the survey was performed by Cragg <br />Surveying using GPS methods.