PERMFILE134266

• Permit No: C1980007
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 70 REFUSE PILE EXPANSION
• Media Type: D
• Archive: No

REFUSE P/LE EXPANSION
three (3) inch size, percent appregate number 4 size to
three quarter (3/4) inch size, and percent aggregate
smaller than number 4 size. The proctor data
~ presentation will include the moisture content and dry
density of each test point used to develop the
moisture content-drydensity relationshipcurve.
•Each nuclear density test site on the refuse pile will
be excavated after completion of each test and the
material will be observed for an unusual amount of
large rocks. The material will then be screened for
percentages of material sizes as determined for the
proctor test and field screen test results will be
reported on the density test results sheet. If the
material appears to have an unusual amount of large
rocks at the test site an offset test will be performed
with the same proceduresas discussedabove.
The minimum test frequency will be quarterly
provided at least one lift (24 inches) has been placed
during the quarter. If one lift has not been placed,
testing may wait until the quarter when the lift is
completed. This represents a minimum frequency of
testing. The number of tests, locations, and methods
will be determined by the Engineer at whatever level
he or she deems appropriate at or above the minimum
test frequency.
Compaction testing will be done in accordance with
good engineering practice.
9.0 RECLAMATION
9.1 Introduction
Reclamation of the RPE will be performed
concurrently with the buildout as lower elevations are
filled to approximate finished grade. Some areas
associated with the RPE, i.e., the sediment pond, haul
road, sediment ditches, will not be reclaimed until the
pile is completely reclaimed and CDMG has
approved the removal of the ponds.
9.2 Topsoil/Subsoil Removal, Storage
and Redistribution
Based on the recommendations provided in the
Baseline Soils Study prepared by Savaee and Savage,
Inc., provided in Appendix h1 of this exhibit, all
available topsoil µ•i11 be removed from the RPE area.
•~ The topsoil will be placed in a stockpile to be located
on the north side of Highway 133, across from the
main entrance to the mine site, known as the North
Soil Storage Area (NSSA). The topsoil stockpile will
be signed and seeded with MCC's approved
permanent seed mix. The stockpile will be utilized
for final reclamation. The subsoil removed from the
Phase 1 area was utilized for construction of the
Sylvester Gulch FacilitiesArea(PR#07). AfierPhase
1 is completed, topsoil and subsoil will continue to be
removed at the same depth, as the RPE expands into
the next phases of construction. Topsoil will continue
to be stockpiled at the NSSA. Subsoil will be
stockpiled in a location to be determined prior to
beginning Phase 3. The location of the subsoil and
topsoil stockpilesare shown on Map 53.
The RPE will be reclaimed with an averaee of a total
of ] 8 to 24 inches of subsoil and topsoil.~A variance
to cover the Lower Refuse Pile with four feet of non-
toxic, non-combustible material was requested and
approved per Technical Revision No. 53. on July 17,
1987. As the coal waste material that will be placed
in the RPE is similar to the waste material in the
lower refuse pile, the cover variance has been applied
to the RPE.
9.3 Revegetation
As the RPE is graded and covered with subsoil and
topsoil, it will be revegetated with the approved
permanent seed mix. The seeding will be done either
by broadcast or hydroseeding. The seeded area will
then be mulched. if soil tests indicate that fertilizer is
needed, it will be applied to the redistributed topsoil.
All soil tests will be performed by a qualified
laboratory using standard soil test procedures
approved by the Division prior [o seeding. Noxious
weeds will be controlled in accordance with the
approved Noxious Weed Control Plan in MCC's
Mining and Reclamation Plan.
Interim and final revegetation monitoring will be
conducted on the RPE in the same manner as the
Lower Refuse Pile, as described in Exhibit 51.
Sampling methods and statistical analysis will he
consistent with those described in Section 2.05.4 of
the permit (Volume I ).
9.4 Hydrologic Reclamation Plan
Harding Lawson Associates 77