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revised mine plan, the effects of subsidence would be within 1370 feet of the Bruce Park Dam and <br />within 750 feet of the Terror Creek Reservoir. The demonstrations of no material damage that were <br />approved in PR-10 also apply to the revised mine plan in PR-11. <br />Because of the extension of B-seam mining to the north, Bowie Resources constructed a vent shaft in <br />the Hubbard Creek area for increased mine ventilation. The vent shaft was approved in Technical <br />Revision No. 48. Because of methane buildup in the active B-seam workings, Bowie Resources <br />recently has received Division approval through Technical Revision No. 62 to construct a ventilation <br />f'an at the Hubbard Creek vent shaft. Also for methane mitigation, the operator has received approval <br />through Minor Revision No. 108 to pump nitrogen into the recently sealed mine longwall panels. <br />Because the proposed B-seam mining in the northern section of the permit area was located underneath <br />the previously mined D-seam mining panels, the operator had to drain the accumulated mine water out <br />of the D-seam workings. Through Technical Revisions 54 and 58, Minor Revision No. 94 and a <br />revised NPDES permit, Bowie Resources pumped mine water from the D-seam workings up to the <br />surface, then piped the mine water over to the Hubbard Creek vent shaft. From there, the mine water <br />was piped down the shaft into the B-seam workings and out by pipeline to the North Fork of the <br />Gunnison River. <br />'section II - Permitting and Enforcement History <br />Minor Revisions (since the Permit Renewal No. 2 Findings date of 6/22/07) <br />MR-81 - Miscellaneous Map Updates <br />- submitted 7/20/07 <br />- approved 8/03/07 <br />- no change in bond liability <br />- no change in disturbed area <br />- no change in affected area <br />MR-82 - Temporary Rock Storage Area <br />- submitted 9/21/07 <br />- approved 9/28/07 <br />- bond liability increased by $9,963.00 <br />- no change in disturbed area <br />- no change in affected area <br />MR-83 - Haul Rock to Bowie No. 1 Mine <br />- submitted 11/07/07 <br />- approved 11/07/07 <br />- no change in bond liability <br />- no change in disturbed area <br />- no change in affected area