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Gated by a correspondingly high SAR and/or ESP value). Values less than pH 7 <br />• may indicate the absence of alkaline-earth carbonates. pH values below 5.0 may <br />indicate an acid-producing material which has a direct relationship to solubil- <br />ity of trace elements. <br />Drill Hole 1C does not have any problem pH values; however, Drill Hole 22C <br />does have a low value (depth 13.9-16.5, pH 4.6). This value'is low because of <br />the presence of pyritic materials in the waste coal present. The potential <br />hazard of this zone will be discussed later under the heading "Acid-Base <br />Potential." <br />Electrical Conductivity. The conductivity of a saturated paste extract is <br />used for appraising salinity in relation to plant growth. E.C. values less than <br />2.5 are considered to have little effect upon growth of most plant species; <br />• whereas, 2.6-5.0 has some effect; 5.0-8.0 a moderate effect; 8.0-12.0 a severe <br />effect, except for tolerant species; and over 12.0 a very severe effect to <br />almost all species. <br />There are no E.C. values in either drill hole greater than 2.0. Therefore, <br />the placement of any material near the surface will not cause a salinity hazard. <br />Saturation Percentage. The saturation percentage is a value which is <br />related to the texture of the material and clay types in the clay fraction. It <br />is used to evaluate the amount of moisture present at wilting points and field <br />capacities and available moisture. High values (greater than 80~) indicate high <br />clay contents, mostly of 2:1 expanding lattice type; while low values (less than <br />20%) represent coarse-textured materials of limited water-holding capacities. <br />. All saturation percentages are in a good range. There are no high values <br />nor low values. <br />- 81 - (Rev. 5/86) <br />