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• Moderately alkaline pM values will decrease the potential for dissolution <br />of soluble metals, including iron, nickel and zinc and should result in <br />no significant potential for adverse hydrologic impacts. Sample pH values <br />indicate no potential for development of acidic conditions and only <br />marginal potential for development of excessively alkaline conditions in <br />the hydrologic system. <br />Electrical Conductivity (ECI. A total of 20 Southfield samples were <br />analyzed with respect to EC. Values of EC ranged from 2.0 to 15.8 <br />mmhos/cm with a mean value of 6.02 mmhos/cm. One Jack O'Lantern roof and <br />one floor sample exceeded the accepted suitability limit for revegetation. <br />Given relatively low mean EC value for all samples, and limited hydraulic <br />conductivity and groundwater flows, there is little potential for <br />significant related impacts on groundwater quality. <br />Saturation Percent (Sat. Yl. A total of IO Southfield samples were <br />analyzed with respect to Sat 70. Saturation percent values ranged from <br />28.0 to 33.4 with a mean value of 31.2. These values are well within <br />published suitability limits for both revegetation and groundwater <br />protection. Therefore, no toxicity or other problems are anticipated with <br />respect to Sat. Ye. <br />Sodium Adsorption Ratio (SARI. A total of 20 Southfield samples were <br />analyzed with respect to SAR. SAR values ranged from 8.7 to 36.2 with an <br />average of 20.3. Initial examination of these values indicates SAR <br />toxicity relative to revegetation. This evaluation is consistent with <br />analysis of coal refuse materials as presented in Exhibit 9, Comparison <br />of Refuse and Soil Suitabilities. As noted in this report, SAR values are <br />expected to be high initially with a rapid decline as associated materials <br />are exposed to oxidation and weathering. Elevated SAR values should not <br />significantly impact groundwater quality due to limited hydraulic <br />conductivity and flows. Groundwater in the mine area is a weak sodium- <br />sulfate type. Elevated SAR values may result in a localized shift in <br />• groundwater chemistry to a more distinct sodium-sulfate type. <br />2.04.6-23 <br />