(c) The following guides are established for attachment of utilities to bridges or highway structures:

1. (1)

   1. (A) Sufficient details and information about the proposed attachment shall be furnished to allow a stress analysis to determine the effect of the added load on the structure.
   2. (B) Other details of the proposed attachment as they affect safety and maintenance should also be provided;
2. (2) When a pipeline is encased, the encasement pipe shall be effectively opened or vented at each end to prevent possible buildup of pressure and to detect leakage of gases or fluids;
3. (3) Shut-off valves, preferably automatic, shall be installed in lines at or near the ends of structures unless segments of the lines can be isolated by other sectionalizing devices within a reasonable distance;
4. (4) When an encasement is not provided for a pipeline, additional protective measures shall be taken, such as employing a higher factor of safety in the design, construction, and testing of the pipeline than would normally be required for cased construction;

5. (5)

   1. (A) Communication and electric power lines shall be suitably insulated, grounded, and carried in protective conduit or pipe from the point of exit from the ground to reentry.
   2. (B) The cable shall be carried to a manhole located beyond the backwall of the structure;
6. (6) Carrier and encasement pipe for other utilities should be suitably insulated from electric power line attachments;

7. (7) All attachments will be made in such a manner as not to interfere with the:

   1. (A) Stream flow;
   2. (B) Highway traffic; or
   3. (C) Routine maintenance;
8. (8) The utility owner shall provide for the lineal expansion and contraction of its facility due to temperature differentials between the utility facility and the structure;
9. (9) Utility mountings shall be of a type, design, and material that will effectively muffle vibration noise;
10. (10) Any maintenance, servicing, or repair of utility lines shall be the responsibility of the utility owner;
11. (11) An engineering analysis of the load effects of an attachment on the structure shall be submitted when requested; and
12. (12) When a utility tunnel within a bridge or highway structure is utilized, mutually hazardous transmittants, such as fuels and electric energy, must be isolated by compartments or separate encasements.