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lateral varlebility across identical strata in the study area. There is vertical . variebillty among strata Yhere certain distinct physlochemicel differences ere apparent between the Lennox, Yadge, end VoLf Creek areas, especially for the parameters pH, seturatfon percent, conductivity, sand content, clay content, boron, and acid-base potential. As discussed ih the Xining enq Mitigation of Unsuitable Overburden section end Teb 21, Minesoil Reconstruction, few of these parameters will impact overall spoil suitability, In many instances, avoidance end typical overburden handling will effectively blend, dilute, bury, and mitigate potentially inimical zones es documentetl in Appehdix 6-3. The major or significant concern within the Yadge coal recovery portion of the Yoast study area is the excessive clay levels found ih the 6b feet of shale strata which overlies the Lennox coal seam. Two less significant or minor concerns are The potential acidity and boron values associated with the Lennox coal seam and encapsulating strata. These strata will be encountered primarily between the Lennox coal outcrop and final highwall in the northwesterh, central neck, end western portions of the mina where the overburden is thicker thah 60 feet (Exhibit 6-3), The major concern within the Volf Creek coal recovery portion of the Yoast study area is the potential acidity associated with the strata located 20 to 35 feet above the coal. This strata will be encountered in the southeastern pert of the mine es shown on Exhibit 6-4, Typical overburden handling will bury much of the clay, boron, and potentially acidic strata. Sampling plans will be used, in the Yadge area where the overburden is thicker then 60 fee[ (as shown on Exhibit 6-4 )l end in the entire Volf Creek area to identify final graded areas having en unsuitable clay, boron, pH, and/or acid base potential level. Tho unsuitable shale and clay strafe encountered in the reduced high wall or upper three feet of final graded spoil will be :scarified prior to being covered with topsoil. Final graded areas having an unsuitable active or potential acidity will be neutralized with amendments or covered with a minimum of four feet of suitable root grouch medium including soil. The sampling plan and mitigative measures are discussed in further detail in Teb 21, Minesoil Reconstruction.. Literature Cited American Society for Testing Materiels (ASTH). 7980. Gaseous Fuels - Coal end Coke - Atmospheric Analysis. Annual Book of ASTH Standards, Pert 26. Donahue, R.L., R.Y, Miller, and J.C. Shickluna. 1977. Soils - An Introduction to Soils end Plant GroNth. Prentice-Nell, Inc., Englewood Cliffs, New Jersey. 626 p. 34 Revised 03/01/95