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• 2.04.6 <br />The sodium adsorption ratio for the roof, interburden and <br />floor exceeds the recommended value for root zone <br />material. This indicates that in order to vegetate <br />refuse material, it will have to be covered with suitable <br />plant growth media. No other parameters identify any <br />physical or chemical properties which would pose a <br />serious problem with respect to revegetation or water <br />quality. <br />(3)(a)(iii)(E) <br />The clay content in the roof, interburden and floor is <br />quite low ranging between 7 and 12 percent. Therefore, <br />engineering properties of clay and clay shale in the <br />stratum immediately above and below the coal seam to be <br />mined is not deemed necessary. <br />• <br />• P6nwxrareLIG1Z011 2-04 - 21 - <br />