location of underground utilities, excavation, estimated location, exact location, N.C.G.S. § 87-101(3), N.C.G.S. § 87-101(5), N.C.G.S. § 95-129(2), 29 CFR § 1926.650(b), 29 CFR § 1926.651(b)(1), 29 CFR § 1926.651(b)(3)

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