Section 6-77-175 - Transmission lines: leakage surveys(a) Each operator of a transmission line shall provide for periodic leakage surveys of the line in its operating and maintenance plan.(b) Leakage surveys of a transmission line must be conducted at intervals not exceeding 15 months, but at least once each calendar year. However, in the case of a transmission line which transports gas in conformity with section 6-77-169 without an odor or odorant, leakage surveys using leak detector equipment must be conducted: (1) In Class 3 locations, at intervals not exceeding 7-1/2 months, but at least twice each calendar year; and(2) In Class 4 locations, at intervals not exceeding 4-1/2 months, but at least four times each calendar year.[Eff ] (Auth: HRS § 269-6) (Imp: 49 C.F.R. §192.705, OCT 1, 1990)