appeal, serious ,trench, excavation, sloping, competent person, ladder, egress from trench, upper landing surface, possibility of accident, substantial probable result, substantial evidence, whole record, reinstatement of penalty, 29 CFR 1926.652(a)(1), 29 CFR 1926.652(b)(l)(i), 29 CFR 1926.652(c), 29 CFR 1926.650, 29 CFR I926.1053(b)(1)

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