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20' 20' 20' <br /> Existing Grade <br /> ------------- <br /> El. = 80' <br /> Daily Inspections of the wall are necessary and any <br /> cause for concern should be brought to the attention <br /> of the Engineer. <br /> Phase 2 Bench <br /> Once the material in the upper bench is safely removed ---- - ---The material in the lower area can be removed El. = 40' <br /> Similar 20'swaths may be used. =\ RemoveterialExcerise extreme care when equipment is operatingwithin 20'of the Highwall � <br /> C----- Mining lines <br /> -- - [:_L = 100, <br /> Highwall @ Helmericks, <br /> Phase 2 <br />