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• In summary, the following analyses were justified based upon Phasz 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. ~4anganese <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 Oakota Goal szam 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 />