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Memo to Erica Crosby 2 Mazch 12, 2005 <br />Lupton Pit Mining Setbacks Permit No. M-2004-078 <br />Based on the DMG analyses, the applicant must commit to a minimum setback of 70 feet from all <br />pennanent valuable manmade structures not under their ownership. Where setbacks greater than 70 feet are <br />required for reasons other than stability, such as the 110 foot setbacks specified from gas wells, of course <br />those greater setbacks would supercede. The Applicant can provide additional information to the DMG to <br />gain approval of setbacks less than 70 feet in areas where the pit will be appreciable shallower than 50 feet <br />in depth. If such a submittal is provided, it must delineate the proposed setbacks in detail on a map that <br />contains contour lines showing the depth to bedrock based on the borings that have been driven. The <br />sufficiency of the number of borings to develop such a map will be reviewed by DMG if a submittal is <br />forthcoming. Also, the Applicant could conduct additional geotechnical testing to determine the actual <br />shear strength properties of the soil strata; the Applicant should consult with DMG prior to undertaking <br />such a sampling and testing program, to be certain that the program will meet with DMG approval. <br />attachment(s) <br />cc: Carl Mount, DMG (via email and w/o attachments) <br />c:\Documents and Settings~acs\My Documrnts\lup[on pit stability.doc <br />