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~J <br />Section 779.14(a) Continued. Rule 2.04.6 <br />can be made. Such a comparison shows that only seven (7) of 53 samples <br />had insufficient amounts of lime to offset the acid-forming potential of <br />the sulfides and only three (3) of these samples had values lower than - <br />5 tons CaCO,/1000 tons of overburden. A total of 86.8 percent of the <br />samples need no additional lime and have a significant excess of lime with <br />respect to that amount needed for neutralization. For all samples, the <br />mean value of excess lime needed is 7.64 tons per 1,000 tons overburden. <br />The maximum excess value is 32.52 and the maximum negative value is - <br />17.85 tons CaCO,/1000 tons of overburden. The three values show a deficit <br />of lime amounting to 8.81 percent of the overburden volume. Given the <br />amount of lime available, no problems are expected with respect to <br />acidity. <br />It should be noted that three (3) samples had insufficient amounts of <br />material to determine sulfate content. As shown in Table 5a, List of <br />Drillholes Sampled for Overburden Analysis, these include the following <br />holes and intervals: 028-79-16: 95-100'; 028-79-36: 30-68'; and 028-19- <br />61; 15-15'. In the case of the first hole, the sulfate content was <br />assumed to be 0.01 percent. Since the sulfide content is computed by <br />subtracting sulfate from total sulfur, use of a conservative estimate of <br />sulfate yields a sulfide value that can be considered 'worst case'. Since <br />the sulfides represent the primary sulfur form having an acid-producing <br />potential, this conservative method yields moderate to high acid- <br />potential values. <br />Coal Analyses. An analysis of the Sudduth Seam is presented in Table 7, <br />Sudduth Coal Seam Analysis. The analysis includes BTU value per pound, <br />percent moisture, percent ash, percent sulfur, trace metals, and mafor and <br />minor elements. The sulfur has been divided into three (3) species: <br />percent pyrite, percent sulfate, and percent organic. The mineral <br />marcasite has not been individually analyzed, but its concentration, along <br />• with that of iron pyrite, is reflected in the analysis for FeS,. An <br />exemption from individual marcasite analysis was grated by OSM for the <br />original application. <br />779-27 a gevi sed - A ri t 19 0 _ <br />