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2009-10-05_PERMIT FILE - C1982057A (2)
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2009-10-05_PERMIT FILE - C1982057A (2)
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Last modified
8/24/2016 3:55:59 PM
Creation date
11/10/2009 10:03:07 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1982057A
IBM Index Class Name
Permit File
Doc Date
10/5/2009
Section_Exhibit Name
Tab 20 Backfilling and Grading
Media Type
D
Archive
Yes
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Thin or thick overburden as defined by Rule 4.14.4 and 4.14.5 does not exist at Seneca II-W. The final <br />volume is greater than 0.8 of the initial volume, therefore the thin overburden criterion is not acceptable. <br />The thick overburden rule does not apply because the final volume is not greater than 1.2 of the initial <br />volume. Please refer to page 6 for the volume calculation methodology. <br />Generally, spoil will be stored in an area that is convenient for final placement in the open pit either by <br />dozing or short hauling with screipers. All salvageable topsoil will be removed from the temporary <br />overburden stockpile areas according to the approved plan before any spoil material is placed. If the <br />existing ground is steeper than 20 percent it will be keyed in a manner that increases the stability of the <br />till. The keyway will be a minimum of 20 feet in width and 1 foot in depth. The keyway will begin at the toe <br />of the fill. The overburden material will be placed in horizontal lifts starting at the tae of the stockpile area. <br />The fill slope of the spoil material shall be 2H:1 V or flatter. This slope is flatter than the angle of repose of <br />the spoil material. During and after construction of the stockpile, runoff from upland areas will be <br />prevented from ponding on or saturating the stockpile. Although ditches or berms to control upland runoff <br />are not anticipated, designs for these types of structures will be submitted for approval should they become <br />necessary. The stockpiles will be stabilized by seeding with the approved temporary reclamation seed mix. <br />Box cut spoil will initially be placed onto unmined land as described in Tab 12. This material will be <br />rehandled when the dragline returns to the box cut area(s). Portions of box cut spoil will be temporarily <br />stored in approved locations above the highwall for backfill into portions of the final pits. All vegetative and <br />organic material and topsoil will be removed from the area where box cut spoil is placed, and the spoil <br />graded both into the mined area and blended into the surrounding terrain. No material shortages or <br />excessive disturbed areas are anticipated in the area of the final highwall or major spoil excesses in the <br />box cut area. This can be determined by reviewing the Operation Plan map (Exhibit 12-2) and pre- and <br />postmining sections presented in the Exhibit 20-4 series, as well as, the pre- and postmining topographic <br />slopes. <br />Surface treatment of graded spoil is discussed in Tab 21. Small depressions are not planned at this time; <br />however, if small depressions are needed to conserve moisture, minimize erosion, create and enhance <br />wildlife habitat or assist revegetation, plans will be submitted for approval prior to construction. Terraces <br />are not planned for Seneca II-W. Proposed permanent impoundments are planned for Seneca II-W and <br />are discussed in Tabs 13 and 17. <br />SCC does not anticipate any grading problems but shall monitor the success of the backfilling and grading <br />program at least annually. This monitoring will include visual inspections of areas graded to determine <br />PR-05 4 Revised 01/06 <br />
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