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2.04.6 <br />(3)(a)(iii)(E) <br />• <br />is <br />PR -12 <br />APPRovQ> <br />l VICP o <br />The clay content in the roof, interburden and floor is quite low ranging <br />between 7 and 12 percent. Therefore, engineering properties of clay and <br />clay shale in the stratum immediately above and below the coal seam to be <br />mined is not deemed necessary. <br />Total sulfur content of the coal seam mined at the Bowie No. 1 mine is <br />generally below 0.5% with the following sulfur forms present: <br />pyritic sulfur = 0.02% <br />sulfate = 0.00% <br />organic sulfur = 0.38% <br />as received basis. Low concentrations of the potentially reactive sulfides <br />(pyrite or the polymorph marcarsite) seemingly preclude any potential for <br />acidic mine drainage. <br />Roof, floor, and interburden samples representative of waste rock at the <br />Bowie No. 1 Mine have been collected and analyzed employing the <br />Division's guidelines. The samples are located in Volume III, Tab 6. These <br />analyses also show the same low sulfur content. The sodium adsorption ratio <br />exceeds the recommended value for root zone material. This indicates that <br />in order to vegetate refuse material, it will have to be covered with suitable <br />plant growth media. <br />2.04-26- 07/10 <br />