Wash. Admin. Code § 468-34-140
The department should ensure adequate study is made by the utility companies to anticipate their needs (present and future) for crossings and to determine if convergence of several crossings can be made to make it more feasible to use a utility tunnel or bridge.
In a combined tunnel or bridge, provision shall be made to isolate mutually hazardous transmittants such as fuels and electric energy by compartmentizing or by auxiliary encasement of incompatible carriers.
The utility tunnel or bridge shall comply in appearance, location, cover, earthwork and markers with the standards as set in the current Standard Specifications for Road, Bridge, and Municipal Construction.
Wash. Admin. Code § 468-34-140
Statutory Authority: Chapter 47.44 RCW. 89-05-022 (Order 119), § 468-34-140, filed 2/10/89. Statutory Authority: 1977 ex.s. c 151. 79-01-033 (DOT Order 10 and Comm. Order 1, Resolution No. 13), § 468-34-140, filed 12/20/78. Formerly WAC 252-04-105.