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• 2.04.6 <br />1] <br />C <br />PR -12 <br />A MAO CD <br />ft/6/10 <br />The high ph values indicate a potential problem for mine water discharge <br />from the B -Seam. <br />Boron is a trace element needed for plant growth, but toxic in excess. <br />Elevated Boron in the B -Seam roof and floor indicates that in order to <br />vegetate refuse material, it will have to be covered with suitable plant growth <br />media. <br />The sodium adsorption ratio for the roof, interburden and floor and coal in <br />the D -Seam and B -Seam exceeds the recommended value for root zone <br />material. This indicates that in order to vegetate refuse material, it will have <br />to be covered with suitable plant growth media. Except as noted above, no <br />other parameters identify any physical or chemical properties which would <br />pose a serious problem with respect to revegetation or water quality. <br />During 2009, the Operator will wash and load E -Seam coal from West Elk <br />Coal Company (WECC). The following information was provided by WECC <br />to demonstrate the E -Seam coal does not have acid forming properties. <br />Average Acid <br />-Base Potential for E -Seam WECC Table 64 <br />Location of <br />Samples <br />Sulfur Form Used for <br />Calculating <br />Acid -Base Potential <br />Weighted- Average <br />Acid -Base Potential <br />(t. CaCO eq. /1000 t. <br />material) <br />E Seam Roof. <br />total <br />+75.7 <br />E Seam Floor <br />total <br />+16.5 <br />E Seam Total <br />total <br />+54.4 <br />According to "Applications of Environmental Chemistry: A Practical Guide for <br />Environmental Professionals'; the acid base potential is equal to the <br />equlivalents of Calcium Carbonates in excess of the amount needed to <br />neutralize the acid that could potentially be produced from oxidation of pyritic <br />sulfur. In general, if the ABP is positive, the leachate from the coal is likely to <br />be basic. <br />2.04-25- 06/10 <br />