2007-11-16_GENERAL DOCUMENTS - C1981041 ‎(3)‎

• Permit No: C1981041
• IBM Index Class Name: General Documents
• Doc Date: 11/16/2007
• Doc Name: Proposed Decision & Findings of Compliance for RN5
• Permit Index Doc Type: Findings
• Media Type: D
• Archive: No

2. Monitoring of side slopes to maintain a maximum slope angle of 2:1 between benches on
CRDA-1, and 2.5:1 on CRDA-2;
3. Monitoring compaction of constructed lifts; and
4. Quarterly inspection for stability and compliance with approved plan by a registered
professional engineer.
Geotechnical analyses included in the permit application show that CRDA-1 and CRDA-2 are stable
at a minimum safety factor of 1.5. The following specific findings apply to the approved refuse
disposal areas.
1. The disposal area will be inspected on a regular basis by a qualified professional specialist under
the direction of the professional engineer, experienced in construction of similar earth and waste
structures. Inspection by this person has been approved by the Division as appropriate
(4.10.2(1)). Inspection shall occur quarterly and at critical construction periods. A copy of the
inspection report will be retained at the mine office and a copy will be forwarded to the Division.
2. An alternative subdrainage system for the coal mine waste area has been approved. The
Division finds that such an alternative will ensure the applicable static safety factor, stability of
the fill, and protection of the surface and groundwater (4.10.3(5)). No underdrains will be
constructed on Cameo Refuse Disposal Areas No. 2. The Roadside Refuse Disposal Area was
also constructed without an underdrain.
3. The permittee has demonstrated, based on physical and chemical analyses of refuse material and
cover soil, and vegetation field trials, that the revegetation requirements of 4.15 can be met with
less than four feet of cover on the coal processing waste bank (4.10.4(5)). This study which was
conducted over a span of 10 years was finalized during the summer of 1993. A determination on
the required cover depth was made by the Division pursuant to approval of Technical Revision
16, in January, 1994. For further relevant discussion, see Section B.III of this document.
VII. Backfilling and Grading
Following removal of mine facilities, buildings, and asphalt, and sealing of underground mine
openings, all areas affected by surface operations will be backfilled and graded as necessary to
stabilize slopes and promote successful revegetation. The anticipated final surface configuration for
each affected surface area, as well as existing and proposed postmine cross-sections, are depicted in
Exhibits 6C through 12C, and Exhibits 26, 27 and 28 of the permit application.
Original reclamation plans for the South Portals area had entailed retention of existing mine bench and
highwall, but the plan had been revised to reflect elimination of the bench and highwall, and to
approximate the general nature of the premining topography, prior to the 1993 permit renewal. As a
component of the 1995 mid-term review, the Division requested additional detail on final reclamation
configuration of the Roadside Refuse Disposal Area (RSRDA), and documentation of reclamation
material balances for the entire South Portal area, including the RSRDA.
PR-02, approved in 1997, included a more detailed final reclamation plan for the Roadside Refuse
Disposal Area (RSRDA) and South Portals disturbance area. Documentation of material balances was
also provided in PR-02, in 1997, and relevant postmine topographic maps and cross-sections were
Permit Renewal No. 5 39 November 16, 2007