Laserfiche WebLink
• 2. Yhere unsuitable shale and clay strata are encountered in the reduced highwall or <br />upper three feet of final graded spoil, an intensive deep ripping or chiseling <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 />aerat(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 />neutralized with amendments or covered with a minimum of four feet suitable root <br />growth medium, including soil. <br />4. It 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 /> Comoactibilit y end Erodibilitv. Determining the compaction potential of disturbed <br /> overburden i s important to assess postmi ne spoil condition including: hydraulic <br /> conductivity, revegetation sutces s, landscape stability, and equipment trafficability. <br /> Generally, st ability 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, [977). These three conditions ere not highly desirable since a high <br /> shrink/swell clay content in postmine land scapes 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 wa ter 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 />having unsuitable clay contents (Tab 6, Appendix b-5) will be blended end diluted to <br />5 Revised 04/24/91 <br />