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Mining Methods and Slope Stability Evaluation for Expanded Development of the Walstrum Aggregate Quarry_ <br /> Avg. <br /> Foliation <br /> E Strike=1270 <br /> Slope is stable N <br /> because walls 1:1 Overall <br /> cut across foliation Slope <br /> planes 40 ft <br /> 40ft <br /> Avg. <br /> Foliation <br /> Dip 480 <br /> Scale: As shown <br /> Figure 4.3 —East Wall Configuration and Orientation of Foliation Planes <br /> 4.3 Rainwater and Snowmelt Drainage <br /> In areas where natural or existing drainage is insufficient, to prevent undue water saturation and <br /> pressure in rock slopes, systems that prevent rainwater and snowmelt from flowing over rock <br /> slopes should be built. These systems might include drainage ditches, collection sumps and pipes <br /> to transfer water to desired down-slope drainage or treatment locations. <br /> 4.4 Blasting Controls <br /> Poor blast design and execution can cause damage to rock slopes. Excessive vibration, poor <br /> burden relief, and improper bench geometry will influence the stability of rock slopes. As noted in <br /> the recently approved blast plan, AFS plans to use non-electric initiators that provide one-hole- <br /> per-delay blast sequencing. This practice should be continued. Furthermore, it would be wise to <br /> limit the diameter of explosive charges to 6.5 inches. <br /> REVEY Associates,Inc. Page 10 of 14 October,2001 <br />