(1) An existing pipeline should be relocated in plan and/or grade whenever the top of the pipe is less than the requirements of the currently applicable standard design plate for underground utility encroachments.

(2) An existing or relocated pipeline shall be encased or otherwise protected wherever such treatment normally would be required for a future pipeline at the site.

(3) An existing pipeline which would lack adequate cover for protection against vehicular live loads or highway construction operations may, in lieu of encasement, be protected by a floating slab.

(4) Notwithstanding reinforcement or protection otherwise provided, the highway construction contractor should be warned and made responsible for the security of each existing pipeline within the construction zone. Where there are unusual utility hazards and where heavy construction equipment will be needed, it should be arranged that the contractor provide an adequate temporary protective cover of earth or bridge the utility if underground.