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Table 6-13 <br /> Chemical and Physical Properties of Interburden <br /> Shale (Unit 4) for <br /> Phase II Samples Collected at Nulca Mine, <br /> November, 1986 <br /> Parameter Phase II Hole Number <br /> Units 873E 874E 875E 876E Mean SD <br /> pH 3.7 3.8 3.6 4.4 3.9 0.4 <br /> EC4, mmhos/cm 2.8 3.7 1.8 6.6 3.7 2. 1 <br /> SPS, % 35.5 38.3 47.2 51.4 43.1 7.4 <br /> Ca, meq/1 20.6 -- -- -- 20.6 -- <br /> Mg,meq/1 5.5 -- -- -- 5.5 -- <br /> Na, meq/1 9.2 -- -- -- 9.2 -- <br /> SAR6 2.5 -- -- -- 2.5 -- <br /> Total S, % 0.28 0.43 0.23 0.35 0.32 0.09 <br /> Sulfate S, % 0.21 0.27 0.00 0.22 0. 17 0. 12 <br /> Pyrite S, % 0.06 0. 15 0.11 0.03 0.09 0.05 <br /> Organic S, % 0.01 0.01 0. 12 0. 10 0.06 0.06 <br /> NP7 -3.7 0.4 -2.2 1.8 -0.9 2.5 <br /> ABP8 -5.9 -4.6 -9.4 -2.3 -5.6 3.0 <br /> Fe, ppm 302.3 41.4 68.2 69.8 120.4 121.9 <br /> Mn, ppm 7.8 8.0 0.3 0.2 4.1 4.4 <br /> Ni , ppm 0.9 -- -- -- 0.9 -- <br /> Zn, ppm 3.8 -- -- -- 3.8 -- <br /> Mo, ppm 0.1 -- -- -- 0.1 -- <br /> lUnit 4 consists of gray and dark gray shale immediately above the lower <br /> 2Dakota Coal seam. <br /> For drill hole location, see Exhibit 6-3A, Overburden Sample Locations. <br /> 4SD-Standard Deviation. <br /> 5EC-Electrical Conductivity. <br /> 6SP-Saturation Percentage. <br /> 7SAR-Sodium Adsorption Ratio. <br /> NP-Neutralization Potential ; Units are tons of CaCO3 required per acre <br /> 8furrow slice. <br /> ABP-Acid Base Potential ; Units are tons of CaCO required per acre furrow <br /> slice; ABP was calculated from Pyrite and Organ�c S. <br /> 6-48 Revised 11/01/86 <br />