(a) Except as provided in subsections (c) and (e), each buried transmission line must be installed with a minimum cover as follows: | | Normal | | Consolidated |
| Location | |soil | | rock |
Inches
| Class 1 locations.............| | 30| | 18 |
| Class 2, 3, and 4 locations...| | 36| | 24 |
| Drainage ditches of public | | | | |
| roads and railroad crossings.| | 36 | | 24 |
(b) Except as provided in subsections (c) and (d), each buried main must be installed with at least twenty four inches of cover.(c) Where an underground structure prevents the installation of a transmission line or main with the minimum cover, the transmission line or main may be installed with less cover if it is provided with additional protection to withstand anticipated external loads.(d) A main may be installed with less than twenty four inches of cover if the law of the State or municipality:(1) Establishes a minimum cover of less than twenty-four inches;(2) Requires that mains be installed in a common trench with other utility lines; and(3) Provides adequately for prevention of damage to the pipe by external forces.(e) All pipe which is installed in a navigable river, stream, or harbor must have minimum cover of forty-eight inches in soil or twenty-four inches in consolidated rock, and all pipe installed in any offshore location underwater less than twelve feet deep, as measured from mean low tide, must have a minimum cover of thirty-six inches in soil or eighteen inches in consolidated rock, between the top of the pipe and the natural bottom. However, less than the minimum cover is permitted in accordance with subsection (c).[Eff ] (Auth: HRS § 269-6) (Imp: 49 C.F.R. §192.327, OCT 1, 1990)