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3.5 Soluble Calcium • Levels of this essential nutrient range from 0.2 to 35.2 meq/1 in the overburden and from 0.1 to 29.2 meq/1 in the underburden. Calcium is the dominant or codominant (with magnesium) cation in the predominantly sandstone overburden. No reclamation problems exist with calcium levels in the range described above. 3.6 Soluble fagnesium Magnesium levels in the overburden range from 0.1 to 82.8 meq/1 while in the underburden, values range from 0.1 to 23.7 meq/1. Magnesium is the dominant cation in shale overburden when high quantities of sulfate are present. No reclamation problems are anticipated from magnesium levels in the range described above. 3.7 Sodium Adsorption Ration (SAR) and Exchangeable Sodium Percentage (ESP) SAR levels in the overburden range from 0.1 to 48.0, while in the underburden, values ranged from 0.2 to 42.7. ESP values, determined if the SAR was greater than 10, range from 37.8 to 52.0 percent in the • overburden and i5.3 to 50.0 percent in the underburden. SAR values in the overburden are generally between 0.3 and 1.0. SAR levels are considerably higher in the underburden. Levels are highest immediately below the Wadge Coal seam and about 30 feet below the Wolf Creek Coal seam. Since the sodic material will not be disturbed during mining, no reclamation problems are anticipated. 3.8 Acid Base Potential Acid base potential ranges from -32.8 to 347.3 TCaC03 in the overburden and from -51.1 to 150.6 TCaC03 in the underburden. Negative values reflect acid or low pH strata. Positive values represent excess base strata. Excess base material exists in Wadge overburden, while Wolf Creek areas are more acidic. Excess base is more prevalent in the overburden than underburden. The Wolf Creek spoils will be sampled, tested, and handled according to procedures stated on Pages 6-29, 6-30, 6-33, 6-34, 6-153, 6-153a, and 6-164 of this application. • 6-146 Revised 08/17/90