Hi,
We (New Mexico) use a note on the plans:
'Location of underground utilities and easements not verified by this plan.
Underground utilities may exist where none are shown. Underground utility
location is based upon information provided by others and may be incomplete
or obsolete at the time of construction. The owner should inform himself of
the location of any utility line, pipeline, or underground and is fully
responsible for any and all damage caused by its failure to locate, identify
and preserve any and all existing utilities, pipelines and underground
utility lines. The owner is urged to comply with state statutes, municipal
and local ordinances, rules and regulations, if any, pertaining to the
location of these lines, in planning and conducting excavation. The owner
should make themselves aware of regulations stated in chapter 62, article
14, NMSA 1978 relating to excavation damage to pipelines and underground
utility lines.'
sc