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Table 6-10 <br /> Chemical and Physical Properties of Overburden Sandstone and <br /> Shale (Unit 1) for 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 6.8 7.3 7.4 -- 7.2 0.3 <br /> EC4, mmhos/cm 3.2 0.9 3.4 -- 2.5 1.4 <br /> SPS, % 41.2 32.0 39.0 -- 37.4 4.8 <br /> Ca , meq/1 17.4 -- -- -- 17.4 -- <br /> Mg,meq/1 14.4 -- -- -- 14.4 -- <br /> Na , meq/1 17.5 -- -- -- 17.5 -- <br /> SAR6 4.1 -- -- -- 4.1 -- <br /> Total S, % 0.18 0.45 0.99 -- 0.54 0.41 <br /> Sulfate S, % 0.09 0.38 0.84 -- 0.44 0.38 <br /> Pyrite S, % 0.02 0.04 0.03 -- 0.03 0.01 <br /> Organic S, % 0.07 0.03 0.12 -- 0.07 0.04 <br /> NP7 71.2 116.5 68.8 -- 85.5 26.9 <br /> ABP8 68.4 114.3 64.1 -- 82.3 27.8 <br /> Fe, ppm 163.3 8.4 10.2 -- 60.6 88.9 <br /> Mn, ppm 2.6 0.6 0.4 -- 1.2 1.2 <br /> Ni , ppm 0.3 -- -- -- 0.3 -- <br /> Zn, ppm 0.6 -- -- -- 0.6 -- <br /> Mo, ppm 0.2 -- -- -- 0.2 -- <br /> lUnit 1 consists of brown sandstone and gray shale above the upper Dakota <br /> 2Coal seam. <br /> 3For drill hole location, see Exhibit 6-3A, Overburden Sample Locations. <br /> 4SD-Standard Deviation. <br /> EC-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 OrgDc S. <br /> 6-45 Revised 11/01/86 <br />