- (1) The grade of the top of pipe within the highway right of way shall comply with the applicable Design Standard for Underground Utility Encroachment.
- (2) Where less than minimum cover is made necessary to avoid obstacles, the pipe should either be rerouted or protected with a casing or concrete slab acceptable to the department.
- (3) Cover for pipelines carrying transmittants which are flammable, corrosive, expansive, energized, or unstable shall not be reduced below safety limits as specified in the appropriate industry standards and specifications.
[Statutory Authority: 1977 ex.s. c 151. WSR 79-01-033 (DOT Order 10 and Comm. Order 1, Resolution No. 13), § 468-34-200, filed 12/20/78. Formerly WAC 252-04-165.]