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Conclusions <br />Results of the Ruby Trust sampling efforts are described below using the data interpretation <br />methods provided in the previous section. <br />SPLP Results : Table 8 provides the results of a comparison of the solid SPLP results <br />to available EPA regulatory thresholds which indicate if the material is potentially <br />hazardous/toxic. There were no exceedences of the available thresholds in any of the <br />samples collected. <br />• Solids Metals Content Analysis: Table 9 provides the results of the comparison of <br />the solids metals content results compared to EPA screening thresholds protective of <br />human health. There were no exceedences of the thresholds in any of the sample results. <br />Solids ABA Analysis: Each of the samples yielded net neutral results with <br />considerable amounts of neutralization capacity (ranging from 83 to 112 t CaC03/Kt ; <br />refer to Table 3). This indicates that little to no acid could be produced by the Ruby <br />Trust materials. The net buffering capacity is largely positive. Using the definitions <br />provided within Table 7, this indicates that the materials are `non-acid' in nature. <br />Solids Forms of S Analysis: The Ruby Trust materials contain forms of S, several of <br />which are not acid forming (Residual S and Sulfate). The materials do contain pyritic <br />sulfur which is unstable and capable of forming acid when in contact with water and <br />atmospheric oxygen. Using pyritic S as a conservative estimate of the acid forming <br />capability of the materials, the ABA parameters were re-calculated to determine worst <br />case ABA conditions (refer to Table 4). Regardless of this conservative approach, the <br />net neutralization potential of the materials was still largely positive (ranging from 59 to <br />83 t CaC03/Kt) which meets the definition of being `non-acid' forming as per Table 7. <br />Water pH: The water qualify of the Ruby Trust portal discharge ranges from 6.9 to 8 <br />with an average of 7.3. This indicates that the water produced and managed <br />underground is circum-neutral indicating that the geochemistry supports a buffering <br />capacity (as emphasized by the ABA and Forms of Sulfur analysis). <br />In conclusion, based upon the above analytical result lines of evidence it appears that the Ruby <br />Trust does not produce any acid generating or toxic- forming materials. <br />9 ?Fage