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The values range from a low of 32.3$ to a high of 74.3 with the <br />• weighted mean being 52.38$. No problems associated with saturation <br />percentage will be encountered. <br />Sodium Absorption Ratio, S.A.R. <br />Wyoming Guidelines state that any litho logy having an <br />S.A.R, in excess of 15 is "unsuitable" as a source for topsoiling <br />material. Twenty-nine of the forty-four samples analysed are in <br />excess of 15, with only two zones of the remaining 15 being under a <br />value of 10. The values range from a low of 7.7 to a high of 43.9 <br />with the weighted mean being 20.70. Except for three zones in the <br />overburden, two of which are above and below the upper split of the <br />Sudduth Coal and one which is a zone of cooly carbonaceous shale, <br />the worst S.A.R. value is found in the zone immediately beneath the <br />topsoil. In fact, this zone has a soluable sodium concentration <br />two times higher than the next highest S.A.R. zone found between the <br />upper and lower split of the Sudduth Coal. From a topsoiling stand- <br />. point, except for the three zones mentioned which will be buried at <br />depth in the pit, any other lithologic zone used near the surface <br />would do nothing but lower the high soluable sodium concentration <br />and sodium absorption ratios exhibited by the present near-surface <br />zone. <br />Cation Exchange Capacity, C.E.C. <br />C.E.C. values were established for all samples having a <br />sodium absorption ratio in excess of 10. The overburden samples <br />tested for cation exchange capacity exhibit values ranging from 9.7 <br />meg/100q to 49.8 meg/100g with the weighted mean being 22.39 meg/ <br />100q. Wyoming guidelines do not establish limits for this <br />parameter. <br /> <br />-23- <br />