Section 19-105-12 - Underground utility crossings(a) All new utility installations involving pressure pipelines shall comply with the American National Standards Institute (ANSI) code for pressure piping B31.1, B31.4 and B31.8. Installations for electric and communication systems shall comply with State of Hawaii "Public Utilities Commission's General Order No. 10" (Hawaii Administrative Rules, title 6, chapter 70).(b) All utility installations carrying flammable and combustible products shall meet the requirements of the: Part 192, Title 49 Code of Federal Regulations, Minimum Safety Standards for Gas Lines: national fire code; State of Hawaii "Public Utilities Commission's General Order No 9" (Hawaii Administrative Rules, title 6, chapter 69); and local county and state codes and requirements.(c) Utilities crossing underground below the roadways of freeways shall be of durable materials and so installed as to virtually preclude any necessity for disturbing the roadways to perform maintenance or expansion operations. Utility lines shall be encased or jacketed. See exhibit "A" attached at the end of this chapter for terminology for encasement and other protection. Casing shall consist of a pipe or other separate structure around and outside of the carrier line or duct line and shall be designed to support the load of the highway and superimposed loads thereon, and shall equal or exceed structural requirements for drainage culverts. The casing shall be composed of materials of satisfactory durability under conditions to which they may be exposed.(d) Upon the completion of a new freeway, all utility installations shall be installed by the boring, jacking or tunneling method.(e) The minimum depth of utility lines shall be 3 feet from the finished grade of pavement to sleeve or concrete jacket in pavement areas. The director may reduce the 3-foot minimum clearance specified above to 2 feet if ground conditions are ascertained to be of rocky material, provided the utility lines do not encroach into the pavement structure.(f) A utility shall make every effort to plan, coordinate, converge, and construct its installation in conjunction with the highway construction. A utility shall further give considerations to the construction of a joint utility tunnel with other utilities or sleeves at strategic locations to accommodate future utility crossings in conjunction with the highway construction.[Eff. MAY 30 1981] (Auth: HRS Sec. 264-24) (Imp: HRS Sec. 264-23)