PERMFILE60492

• Permit No: C1994082A
• IBM Index Class Name: Permit File
• Doc Date: 9/30/2002
• Section_Exhibit Name: Tab 21 Minesoil Reconstruction
• Media Type: D
• Archive: Yes

• 1. Tha area around a suspect hole will be sampled on a closer spacing interval in order
to better define the lateral extent and variability of the unsuitable materiel.
2. Yhare unsuitable shale and clay strata ere encountered in the reduced highwall or
upper three feet of final graded spoil, an intensive deep ripping or chiseling
program will be initiated. The major advantages of deep ripping ere related to the
phyaicel properties of the soil. soi la ere ripped to decrease compaction, increase
aeration and water movement, and increase plant rooting depths (Redente and Xargi s,
1985; Josiah, 1986).
3. find graded areas having an unsuitable active or potential acidity or boron value
well be neutralized with amendments or covered with a minimum of four feet suitable
root growth medium, including soil.
4. It none of the above procedures satisfactorily mitigate a certain problem, [he
Division will be notified and recommended actions will then be implemented.
Peabody will me~ntain records of the sampling results for each logical reclamation unit.
These records will be kept on file at the mine site or SCC's Corporate office end will be
reported within the annual reclamation report.
• This
li ill
h
f
f f
fi
samp
ng program w
ensure t
e top
our
eet o
replaced soil and
nal graded
spoil is non-toxic and chemically/physically suitable to enhance plant growth.
Comoactibility and Erodibilitv. Determining the compaction potential of disturbed
overburden is important [o assess postmine spoil condition including: hydraulic
conductivity, revegetation success, landscape stability, and equipment trafficability.
Generally, stability and/or compaction problems are refaced to soils high in shrink/swell
clays, soils with large proportions of sand and clay (sandy Clay texture), and soils with
approximately equal proportions of sand, silt, and clay size particle fractions (Arnold
and Dollhopf, 1977). These three conditions are not highly desirable since a high
shrink/swell clay content in postmine landscapes causes poor stability and low
permeability conditions, a sandy clay textured soil develops surface crusting problems,
and an equal particle size distribution causes excessive compaction which results in
restricted water movement and root growth.
The first two considerations listed above are among [hose used for establishing the
grading system for texture. Spoils grading poor in texture are discussed within the
•
previous subsection of this tab and in the Xixing and Mitigation of Unsuitable Material
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