non general contractor liability under the multiemployer worksite doctrine
trench
excavation
competent person
removal of employees from trench
29 CFR § 1926.20(b)(1)
29 CFR § 1926.20(b)(2)
29 CFR § 1926.10
29 CFR § 1926.16
29 CFR § 1926.32(j)
29 CFR § 1926.32(k)
29 CFR § 1926.650(b)
29 CFR § 1926.651(k)(2)
N.C.G.S. § 95-127(18