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Exchangeable Sodium Percentage, E,S.P. <br />• <br />E.S.P. values were also determined for all samples having <br />a sodium absorption ratio in excess of 10. The values range from <br />11.7 to 44.3 with a weighted mean value of 22.09. Except for the <br />zone between the upper and lower split of the Sudduth Coal, the <br />worst exchangeable sodium percentage found is for that of the top <br />10 feet of the hole (36.1). As discussed previously, any other <br />lithologic zone utilized near the surface (except for the ones <br />mentioned) would not make the near surface material any more sodic <br />than it already is. Random mixing of these less sodic zones in the <br />overburden spoil would probably provide for lower concentrations <br />of sodium near the surface. <br />Lime, CaCO3 <br />The values for lime are extremely low ranging from <br />• 0.38 to 58 with the weighted mean being 4.78. All of these values <br />are well below the maximum percentage allowable for the "good" <br />category (158), Except for one other zone, the highest concentration <br />of lime is in the near surface material. No toxic problem will <br />result with respect to lime in potential topsoil suitability <br />or ground water quality. <br />Boron, B <br />As for lime, the values for boron are well below the <br />maximum acceptable for the "good" category (Sppm). The range <br />of values is from 0.1 ppm to 0.5 ppm with a weighted mean of 0.21 <br />ppm, No possible toxicity problems will result with respect <br />to boron. <br />Nitrate - Nitrogen, NO3 - N <br />• The range of values for nitrate-nitrogen is from 5 ppm <br />to 36 ppm with the weighted mean value being 10.20 ppm. Generally, <br />-24- <br />