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�f•.t t: <br /> dill <br /> Area 1. <br /> �'A bench from which the main portal was develop <br /> Sectors 1A & 1B <br /> The colluvial material along the base of the cut, which has achieved a relatively moderate slope along the <br /> base, should be undisturbed; the bench itself will be left as a base for this material, except that the bench <br /> will be narrowed. <br /> Slide Zone <br /> t , <br /> Sector 1A . <br /> M <br /> The portal at the highwall has been sealed. Material will be excavated from the edge of the bench fill <br /> adjacent the highwall, retreating to the edge of the rock excavation area. This material can be used to <br /> cover the portal. <br /> Lack of material precludes backfill of the entire cut above the portal; moreover, the fact that this is an <br /> avalanche zone makes extensive backfilling extremely unwise. Avalanching would carry the backfilled <br /> material over the slope and down to the upper reaches of Coal Creek, following the path of the <br /> outwashed material presently in the lower yard area. In the interest of stability and of the protection of <br /> Coal Creek, fill material placed over the portal will be kept at a relatively low angle along the base of the <br /> cut- <br />