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When exposed coal seams occur in the lower portion of the final highwall, backfill material at the seam <br />locations will be of noncombustible material placed in a manner to provide at least four feet of <br />covering. Reclaimed highwalls shall be monitored visually on a quarterly basis to identify any evidence <br />of burning coal. Should evidence indicate coal seams are burning, Seneca shall excavate, extinguish <br />and backfill to the extent practicable, the burning portion of the coal seam <br />• <br />• <br />10 Revised 7/99 <br />