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<br /> <br />The slope configuration and geometry discussed in the above quote are illustrated in the following <br />diagram: - <br />E_ ~ <br />yr Y <br />c n <br />E D <br />E ~ 100 ft. to rotected <br />75 (t. setback to P <br />accommodate sloughing I structure or boundary <br />water line <br />As illustrated above, dredge mining would cease when the dredge approaches within 175 feet of the <br />structure or boundary from which the setback is established. Similarly, in the case of a 25-foot <br />setback, as proposed for the gas/oil pipelines, and if the pit depth is again 60 feet, the mining limit <br />would be 100 jeer from the protected structure or boundary. This approach to the establishment of <br />mining setbacks can be described by the following expression: <br />(se[batk distan<e)+ 11.25 x (pit depth)I =distance mining may occur from a protected s[rutture or boundary <br />This approach to the establishment of setbacks is conservative and is acceptable to the Division <br />without any further analysis required by the Applicant. However, this type of requirement may tend <br />to create complications for the pit operator in the long term. [f the pit foreman and other essential <br />w <br />bedrock <br />