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2017-04-05_GENERAL DOCUMENTS - C1982057
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2017-04-05_GENERAL DOCUMENTS - C1982057
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Last modified
4/10/2017 10:14:52 AM
Creation date
4/10/2017 10:12:09 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1982057
IBM Index Class Name
General Documents
Doc Date
4/5/2017
Doc Name Note
Includes Reclamation Cost Estimate
Doc Name
Proposed Decision and Findings of Compliance
From
Seneca Property LLC
To
DRMS
Permit Index Doc Type
Findings
Email Name
JDM
JHB
Media Type
D
Archive
No
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highwall locations and various Wolf Creek/Sage Creek pit locations of the South Extension Area, <br />but the plans were not implemented and were withdrawn by PR -5. <br />The permit application provides detailed information on mining and reclamation operations, <br />transportation routes, and hydrologic controls for the mine. Coal mined was owned by private <br />interest and the Federal government, under lease to Seneca Coal Company. Surface ownership <br />includes federal lands managed by the BLM, and a variety of private leases, subleases and <br />easements. <br />The total permitted area is approximately 3,878.5 acres. The maximum proposed disturbed area <br />is 1334.5 acres. The disturbed area includes the mine pit area, surface support facilities, haul roads <br />and drainage control facilities. In addition to the primary disturbance areas described, various <br />exhibits and text refer to a number of "minimal disturbance" areas, totaling approximately 56 acres. <br />These areas are primarily located along ephemeral drainages between primary disturbance areas <br />and sedimentation ponds, and could potentially be impacted by sediment deposition or erosion, <br />and associated maintenance activity. <br />Coal extraction operations began at Seneca II -W in 1990, and continued until January 2006, when <br />coal production at Seneca II -W ceased. Over the life of the mine, total coal production was <br />12,069,059 tons. Annual production ranged from a low of 376,700 tons to a maximum 990,300 <br />tons. <br />During the period of active mining operations, reclamation was conducted concurrently with <br />mining, with the exception of approved variance areas where backfilling was delayed to <br />accommodate proposed auger mining, highwall mining, or other site specific considerations. Due <br />to the nature of the mining plan and the operational history, the application contains a request for <br />a variance from the contemporaneous reclamation requirements of Rule 4.14. This request is <br />discussed further in Section VII of this document. The generalized reclamation sequence that was <br />followed during active operations is described in the following paragraph. <br />Topsoil was removed and stockpiled or, when possible, live -handled. Following topsoil removal, <br />the overburden was blasted. Using the dragline, initial box cut spoil was placed onto previously <br />stripped but unmined ground creating a temporary overburden stockpile, with each successive cut <br />going into the previous pit after coal was removed. The resulting spoils were graded to <br />approximate original contour, topsoiled and seeded. Permanent post -mine drainage channels were <br />constructed in accordance with approved design specifications. Within scattered designated <br />locations, areas of one to two acres in size received concentrated planting and seeding of native <br />shrubs and seeding of native forbs. Several of the designated areas were also planted with aspen <br />saplings. Grasses were not seeded within these locations, in order to minimize competition <br />between the relatively quick developing and competitive grasses and the slower growing woody <br />plants. A number of the concentrated tree/shrub areas were fenced to protect woody plantings <br />from excessive browsing by large ungulates. The revegetation plan associated with PR -3 included <br />a commitment and detailed design plans for an aspen reestablishment study, to evaluate the <br />feasibility of transplanting native aspen saplings with variable soil treatments and irrigation <br />application rates. Results of the study have been incorporated into the permit application package, <br />as Appendix 22-3 to Tab 22, Revegetation Plan. <br />xii <br />
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