2008-09-05_PERMIT FILE - C1981012A ‎(2)‎

• Permit No: C1981012A
• IBM Index Class Name: Permit File
• Doc Date: 9/5/2008
• Section_Exhibit Name: Section 2.05 Operation and Reclamation Plan
• Media Type: D
• Archive: Yes

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As shown on Map 24, Refuse Area, an access road has been
constructed along the west side of the RDA. The refuse area will
be serviced by this access road.
Figure 6, RDA Final Configuration, shows the refuse fill
area. The refuse disposal area will be constructed as shown by the
conceptual plan and cross sections illustrated in Figure 7,
Conceptual Fill Configuration, Figure 8, Generalized Cross
Sections, and Figure 9, Benched Keyway Cut. Outslopes will be
2H:1V, benches will drain to rip-rapped side ditches along the
contact between the refuse and undisturbed areas. Benches and
roads will be sloped so that drainage will be routed to toe areas
before draining laterally to the rip-rapped side ditches. Figure
10 shows the final drainage configuration of the pile. All runoff
within the basin whether disturbed or undisturbed will enter pond
008 via side collection ditches. Pond 006 has been sized to
accommodate this runoff. Although this is an ephemeral drainage
with no springs or seeps, an underdrain made up to durable rock
will be maintained along the existing drainage for the length of
the fill. Temporary diversion ditches will be installed above the
rock underdrain to divert runoff away from drains and minimize
clogging. The drains will consist of durable rock placed to
minimum dimensions of 16 feet wide and eight feet high. The rock
will consist primarily of 1 to 3 foot boulders with occasional
smaller or larger pieces (see Exhibit 30, Supplemental Stability
Investigation RDA). In addition to the temporary diversion system,
and as outlined in section 4.09.2, a filter fabric will also be
used to keep the underdrain free of debris and refuse. The fabric
will be placed on top of the rock underdrain in advance of the
refuse disposal (see Figure 8). Typically, Wyoming Fuel Company
will use a fabric which is inert to biological degradation,
naturally encountered chemicals, alkalies and acids, and has the
following characteristics:
Weight
Thickness
Apparent Opening Size
Flow Rate
A benched keyway
Figure 9, Benched Keyway Cut,
and allow for subdrainage.
6.05 oz/sq
7.5 mil
100 + (U.S
100 gpm/cu
yd.
Std Sieve)
ft.
cut will be constructed as shown on
in the toe area to stabilize the toe
2.05-28 (Revised 12-18-98)
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