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November 2002. Specific findings pursuant to Rule 4.10.1(2), allowing for disposal of <br /> waste material from sources outside of the permit area,were at that mine included in the <br /> approved permit for the Munger Canyon Mine. Development work was completed in the <br /> fall of 2004 and initial waste disposal at the Munger Canyon disposal site occurred in late <br /> November 2004. Several small temporary coal waste stockpiles are approved in the <br /> vicinity of the product coal stockpile at the McClane Canyon Mine. With the approval of <br /> TR-16 for the McClane Canyon Mine in 2009, a new plan for the coal mine waste <br /> disposal site was approved. The technical revision allowed for the construction of a coal <br /> mine waste disposal site within the McClane Canyon Mine permit area, in the vicinity of <br /> the existing sediment pond and soil stockpiles. Final capacity of the disposal site would <br /> be approximately 38,000 cubic yards. Additional disturbed area would be approximately <br /> 4.75 acres and would include relocated soils stockpiles and a new sedimentation pond. <br /> Technical Revision No. 16 was approved in 2009 after the reclamation of the reclamation <br /> of the coal mine waste disposal site at the Munger Canyon Mine had begun. Bond <br /> Release Application SL-03 for the Munger Canyon Mine received Final Approval on <br /> October 10, 2018. This action additionally resulted in the termination of Division <br /> jurisdiction over the Munger Canyon Mine. <br /> The McClane Canyon application also notes that rock slope material will be disposed of <br /> in areas of the mine that are no longer actively producing coal, as authorized by MSHA. <br /> As noted on page 7 of the Division's February 19, 1999 mid-term review document, <br /> disposal within the mine is limited to rock generated during the normal course of mining <br /> operations, in accordance with standard industry practice, and in compliance with <br /> applicable MSHA requirements. Return of coal mine waste from the surface to <br /> underground workings is not approved. <br /> Non-coal waste (e.g.trash and non-coal combustibles) are stored in a dumpster on site and <br /> hauled off for permanent disposal by a commercial trash company. There is no <br /> permanent disposal of non-coal waste material on-site. <br /> X. Backfilling and Grading—Rule 4.14 <br /> Information relevant to backfilling and grading is presented in Sections 3.0 and 3.3-1, of <br /> the PAP. Post-mining contour maps and cross sections are included as Figures 3.1-1 and <br /> 3.1-2, pre-mine topography is depicted on Figure 3.1-3, and a stability analysis section is <br /> depicted on Figure 3.1-4 of the PAP. <br /> The lower portion of the affected area will be returned to approximate original contour <br /> (AOC),but the mine bench area will not be returned to AOC. The operator submitted <br /> information in the original permit application, and in association with the 1985 permit <br /> renewal, demonstrating that the mine bench area qualified as steep slope mining pursuant <br /> to 2.06 and 4.27. The Division approved a limited variance to the AOC requirements of <br /> 4.14 and 4.27.3, to allow for backfilled slopes of lesser steepness,which would meet <br /> applicable stability criteria and support the approved post-mine land use. Average slopes <br /> in the mine bench area prior to mining ranged from 80%to 85%,whereas the backfilled <br /> valley side slopes will range from approximately 40%to 60%. <br /> xxiv <br />