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Table3-Deere's classification based on RQD <br />RQD Description of rock quality <br />0-25 Very poor <br />25-50 Poor <br />50-75 Fair <br />75-90 Good <br />90-100 Excellent <br />Figure 13 presents an RQD profile along the axis of TC-03-02. Clearly RQD values are <br />low near the cleated B Seam but rapidly increase into the roof. The C-Sandstone (Upper <br />Marine Sandstone), located some 140-ft above the Upper B Seam, has excellent rock <br />quality. Because of lateral consistency of this unit, this sandstone will contribute <br />significantly to the stability of the overburden. <br />C <br />0 <br />• <br />Maleki Technologies, Inc. Page 23