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In summary, the following analyses were justified based upon Phase I <br /> results and were performed on Phase II OIU samples collected from Mine <br /> Areas 2 and 3 to assess revegetation potential or to evaluate potential <br /> impacts to water quality: <br /> 1. Saturation Percentage <br /> 2. pH <br /> 3. EC <br /> 4. Total Sulfur <br /> 5. Sulfur fractionation when potential acidity exceeds the <br /> neutralization potential and when the total sulfur content is <br /> greater than 0.5 percent. <br /> 6. Neutralization Potential <br /> 7. Acid Base Potential <br /> 8. Manganese <br /> 9. Molybdenum, nickel and zinc for site 873E only. <br /> 10. Iron <br /> Laboratory Methods. The parameter/procedure list utilized for the 1986 <br /> OIU samples sites is listed in Table 6-8. <br /> Overburden, Interburden and Underburden Lithology - Phase II . <br /> Lithologic descriptions for drill holes 873E, 874E, 875E and 876E are <br /> contained in Appendix 6-1. The analytical results for these locations <br /> are presented in Appendix 6-4. Based upon these descriptions and the <br /> chemical and analytical analyses , the following overburden and <br /> interburden lithologic units were developed: <br /> Unit 1: The upper four to five feet of overburden consisting of <br /> brown to light brownish gray sandstone and light gray <br /> to gray shale. <br /> Unit 2: The oxidized and weathered upper Dakota Coal seam and <br /> encapsulating very dark gray to black carbonaceous <br /> shale. The average thickness is three to five feet. <br /> 6-39 Revised 3/6/87 <br />