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<br />State Reg. <br />C 3.5 Soluble Calcium <br />Levels of this essential nutrient range from 0.2 to 35.2 meq/1 <br />in the overburden and from 0.1 to 29.2 meq/1 in the <br />underburden. Calcium is the dominant or codominant (with <br />magnesium) cation in the predominantly sandstone overburden. <br />No reclamation problems exist with calcium levels in the range <br />described above. <br />3.6 Soluble Magnesium <br />Magnesium levels in the overburden range from 0.1 to 82.8 meq/1 <br />while in the underburden, values range from 0.1 to 23.7 meq/l. <br />Magnesium is the dominant cation in shale overburden when high <br />quantities of sulfate are present. No reclamation problems are <br />anticipated from magnesium levels in the range described above. <br />3.7 Sodium Adsorption Ration (SAR) and Exchangeable Sodium <br />Percentage (ESP) <br />SAR levels in the overburden range from 0.1 to 48.0, while in <br />the underburden, values ranged from 0.2 ,to 42.7. ESP values, <br />determined if the SAR was > 10, range from 37.8 to 52.0 percent <br />in the overburden and 15.3 to 50.0 percent in the underburden. <br />SAR values in the overburden are generally between 0.3 and 1.0. <br />SAR levels are considerably higher in the underburden. Levels <br />are highest immediately below the Wadge Coal learn and about 30 <br />feet below the Wolf Creek Coal seam. Since the sodic material <br />will not be disturbed during mining, no reclamation problems <br />are anticipated. <br />3.8 Acid Sase Potential <br />Acid base potential ranges from -32.8 to 347.3 TCaC03 in the <br />overburden and from -51.1 to 150.6 TCaC03 in the underburden. <br />Negative values reflect acid or low pH strata. Positive values <br />represent excess base strata. Excess base material exists in <br />Wadge overburden, while Wolf Creek areas are more acidic. <br />Excess base is more prevalent in the overburden than <br />underburden. The Wolf Creek spoils will be sampled and tested <br />6-146 Revised 10/1/86 <br />