2009-11-13_PERMIT FILE - C1982056 ‎(3)‎

• Permit No: C1982056
• IBM Index Class Name: Permit File
• Doc Date: 11/13/2009
• Section_Exhibit Name: Exhibit 26C Coal Refuse Disposal Area Expansion
• Media Type: D
• Archive: No

• CRDA Expansion
Cover and Soil Material Handling Summary 161'
Area Designation Acres Cover Volumes Soil Volumes
Stripped Replaced Stripped Replaced
Existing RDA
Area 1 East Face 8.2 26,570' 33,220 19,930' 19,930
Areas 2.0, 2.5, 3.0 29.7 0 119,700 0 71,820
East Face _
CRDA Expansion Area 96.5 545,040 389,320 233,590 233,590
Entire CRDA Area 29,370
,
Totals 134.4.; 571,610 571,610 253,520 ,. _ : "325,340 = '
• Co�t
Notes:
Soil/cover material from east face of Area 1, existing RDA, will move to west face
2 Materials replaced from existing stockpiles (SF -6, and SF -12 through SF -14)
3 Soil/cover materials have already been stripped and stockpiled from these areas
° Difference in stripping/replacement volumes reflects stripping 3.5 ft and replacing 2.5 feet
5 Excess volume will be used to address any deficit in materials for the existing RDA; selectively
increase cover depth on specific areas to achieve targeted reclamation objectives; and provide
some supplemental material to address potential for large rocks in the recovered spoil materials
Depending on the amount of boulders in the excavated reclaim spoils, additional cover soil materials may
be required. This should be evaluated at the time of stripping of the reclaim spoils.
Inspection and Testing
The CRDA Expansion must be inspected at least quarterly by an engineer from NWCC, Inc., beginning
within 7 days after the preparation of the disposal area begins, in accordance with Section 4.10.2 of the
regulations. The quarterly inspections must continue until the CRDA has been covered, soil has been
placed and revegetated or as required by the CDRMS. In addition, the following items should be inspected
and/or tested by NWCC, Inc. during construction of the CRDA Expansion.
1) After stripping of the soil materials and excavation of the proposed cover materials, to confirm the
foundation conditions are as anticipated in this report.
2) Initial drain construction to evaluate construction procedures. Samples of the drain rock and filter
material may require testing prior to use, in order to evaluate gradation and durability.
3) The coal waste product to be used in construction of the CRDA should be evaluated for gradation,
Standard Proctor and moisture content to confirm the properties used in the design.
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Job Number: 08 -7915 NWCC, Inc. Page 11
Revised 10/12/09