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• 2. Yhere unsuitable shale and <br />u <br />er three feet of final clay strata are encountered <br />graded s <br />oil <br />an intensive in the reduced highwall or <br />deep ri <br />or chiseling <br />in <br /> pp , <br />p pp <br />g <br /> program will be initiated. The major advantages of deep ripping are related to the <br /> physical properties of the soil. Soils are ripped to decrease compaction, increase <br /> aerac(on and water movement, and increase plant rooting depths (RedenTe end Hargis, <br /> 1985; Jasieh, 1986). <br /> 3. Final graded areas having an unsuitable active or potential acidity will be <br /> neutral fixed with amendments or covered with a minimum of four feet suitable root <br />growth medium, including soil. <br />4. If none of the above procedures satisfactorily mitigate a certain problem, the <br />Division wfll be notified end recommended actions will then be implemented. <br />Peabody will maintain records of the sampling results for each logical reclamation unit. <br />These records will be kept on file at the mine site or Division office and will be <br />reported within the annual reclamation report. <br />This sampling program will ensure that the top four feet of replaced topsoil and final <br />• graded spoil is non-toxic end chemically/physically suitable to enhance plant growth. <br />Comoactibility end Erodibilitv. Determining the compaction potential of disturbed <br />overburden is important to assess postmi ne spoil condition including: hydraulic <br />conductivity, revegetation success, landscape stability, and equipment trafficability. <br />Generally, stability end/or compaction problems are related [o soils high in shrink/swell <br />clays, soils with large proportions of sand end clay (sandy clay texture), and soils with <br />approzimetely equal proportions of send, silt, and clay size particle fractions (Arnold <br />and Dollhopf, 7977). These three conditions ere not highly desirable since a high <br />shrink/swell clay content in postmine landscapes causes poor stability and low <br />permeability conditions, a sandy clay textured soil develops surface crusting problems, <br />and an equal particle size distribution causes excessive compaction vh ich results in <br />restricted water movement and root growth. <br /> The first two considerations Listed above are among those used for establishing the <br /> grading system for texture. Spoils grading poor in texture ere discussed within the <br /> previous subsection of this tab and in the Mixing end Mitigation of Unsuitable Material <br /> section of Teb b. Xany of the 31 overburden sample intervals that were identified as <br />• h <br />i <br />T <br />b <br />i <br /> av <br />ng unsu <br />a <br />table clay contents ( 6, Appendix b-5) w ill be blended end diluted to <br />5 Revised 04/24/91 <br />