(A) For the purpose of this section, underground conduits shall be considered sewer pipe, water main, culverts, or any other pipe conduits indicated on the plans. Wherever the term "pipe" or "pipe line" is used, it shall mean underground conduit.
(B) Excavation and backfill shall include all excavation backfilling, compacting, disposal of surplus material, restoration of all disturbed surface, and all other work incidental to the construction of trenches, including any additional excavation which may be required for manholes or other structures forming a part of the pipe line.