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• 2.04.6(2)(b) <br />The core from one drill hole in the east half of <br />section 33, (Mining Area No. 3), was analyzed for geochemical <br />parameters to identify physical and chemical properties of the <br />overburden, interburden and the stratum immediately below the <br />lowest coal seam to be mined and the extent of any materials which <br />may have an adverse effect on the environment. <br />The following table presents the results of the <br />geochemical analysis and limits from published guidelines. <br />PARAMETER MIN MAX LIMIT REF <br />pH Units 5.1 7.3 5 - 9 1 <br />Conductivity umhos/cm 1850 5700 8000 1 <br />Saturation Percentage $ 30.3 78.5 25 - 85 2 <br />Texture Class 8 Clay 5 46 35 (B) 2 <br />Sodium Adsorption Ratio 0.48 1.902 10 1 <br />Selenium mg/kg 0.004 0.020 0.1 2 <br />Boron mg/kg 0.0 0.14 5.0 1 <br />Nitrate, Nitrogen mg/kg 0.0 12.3 50 1 <br />Molybdenum mg/kg 0.08 0.36 1.0 1 <br />Acid Base Potential (A) -10.1 0.21 -5.0 (C) 1 <br />Arsenic mg/kg 0.02 0.18 2.0 1 <br />iron mg/kg 52 184 - <br />• <br />Cadmium mg/kg 0.0 0.17 1.0 2 <br />Copper mg/kg 0.15 3.30 40 2 <br />Lead mg/kg 1.21 12.6 20 2 <br />Manganese mg/kg 1.35 26.4 60 2 <br />Mercury mg/kg 0.01 0.13 0.5 2 <br />Zinc mg/kg 5.14 30.0 40 2 <br />Reference: 1. Wyoming, Department of Environmental Quality, <br />(DEQ), guideline N0. 1 dated November 1984. <br />2. Montana, Department of State Lands Guidelines. <br />(A) Tons CaCO3 per 1000 tons material <br />(B) One of the seven samples exceeded the recommended limit of 35 <br />percent clay. The average percent clay for the seven samples <br />was 22.28. Since only one sample was over the suspect level <br />and the average percent clay content is well below the suspect <br />level, no problems are anticipated with respect to texture in <br />the regraded overburden. <br />(C) One of the seven samples had an acid base potential of -10.1 <br />which indicates this horizon has an acid forming potential. <br />This horizon also has a high sulfur content. Since only one <br />of the seven samples has an acid forming potential, no <br />problems are anticipated because this material will be mixed <br />• with other material during overburden removal. <br />2.04-10i July 1992 <br />