2011-01-13_PERMIT FILE - C1981014A

• Permit No: C1981014A
• IBM Index Class Name: Permit File
• Doc Date: 1/13/2011
• Section_Exhibit Name: 2.05.3 Operation Plan -Permit Area
• Media Type: D
• Archive: Yes

Evaluation of the proposed refuse pile expansion addressed adequacy of
• existing refuse placement practices, provisions for effective drainage,
recommended future placement practices, and consideration of maximum
stockpile height. Given the need for long term stability and a minimum
static factor safety of 1.5, RMG's evaluation indicated that existing refuse
placement practices resulted in a well consolidated stable fill, with in-
place densities consistent with design criteria.
The report evaluated several different foundation and hydrologic conditions
as well as several alternatives for total pile height. The report concluded
that with establishment of proper subdrainage, placement of dewatered mixed
coarse and fine refuse in lifts no greater than three (3) feet, and adequate
surface drainage, the pile could be constructed to a maximum height of 75
feet while maintaining a factor of safety greater than 1.5. As the design
basis for ongoing and future coal refuse placement and stockpile
construction, the RMG report, presented in Exhibit 18. Geotechnical
Investigations, was prepared under the direct supervision and was certified
by a qualified Registered Professional Engineer.
• EFCI surveyed the existing refuse stockpile in early 1989 and found stockpile
thickness to vary from approximately 40 to 65 feet. At that time, given
future production projections, EFCI determined that additional refuse
capacity would be required, and submitted a technical revision. TR-07, Coal
Refuse Pile Expansion, to expand the coal refuse pile to the southwest
encompassing a surface area of approximately 7.5 acres. During development
of the technical revision, EFCI made appropriate modifications to the final
stockpile configuration, and modified designs for the related
diversion/collection ditches. The modified final stockpile configuration, as
approved by the MLRD, is illustrated by the Coal Refuse Pile Expansion Map,
(Map TR07.1), included in Exhibit 15, Minor and Technical Revisions. In
1994, as a result of the current coal market. EFCI reduced its total coal
reserves and the projected life of mine, thus reducing the amount of refuse
storage volume required. Asa result, the refuse pile design was revised to
reflect the reduced required storage volume. The revised refuse pile is
shown on the Mine Area Post Mining Map 28 (Map 28), and Post-Mining Cross-
• Section Map (Map 7)
C: \TM16601V OL. 110P.PLN
10IO619410:59emWP51/cme 2.05.3-32R Revised - 10/07/94