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12) The highwall adjacent to the lower asphalt plant facilities and the area <br />above the highwall were visually inspected as part of the Feld <br />reconnaissance inspections performed in April 2006. Unlike the highwalls <br />for the areas currently being mined, the bedrock in the highwall of the <br />asphalt plant is sedimentary, consisting of shales and sandstones upturned <br />to near vertical orientations, striking almost north-south. The highwall <br />located immediately west and north of the bottom plant facility is currently <br />stable, with no evidence of highwall instabilities. No major cracks, <br />settlement, or ponding areas were observed at the ground surface above <br />the highwall, and it appears that the asphalt plant highwall is stable under <br />the current conditions. <br />In addition to the inspection of the highwall, observations along the access <br />road to the upper asphalt plant facilities were also made with no surface <br />cracks or settlement noted. The road is aligned perpendicular to the strike <br />of the nearly vertical bedded sedimentary rock, which is a favorable <br />orientation for slope stability along the access road. <br />13) An anomaly noted in a letter report to Lafarge, dated April 9, 2004, <br />regarding a small "bulge" or slump on the southern wall was again re- <br />evaluated in the field investigation this year. There have been no visible <br />changes in this feature over the past 24 months, and it has continued to <br />remain stable. This wall is considered to be a temporary wall and will be <br />excavated as the southern expansion area deepens. <br />-14- <br />