| (a) All trenches and holes created during the maintenance,
alteration, repair, or service of an irrigation system must be backfilled
and returned to the original grade with suitable soil free of any
objects that could damage the plumbing of the irrigation system. The
backfill must be compacted such that a depression does not develop.
(b) Colored polyvinyl chloride (PVC) pipe primer solvent
must be used on all PVC pipes and fittings used in the maintenance,
alteration, repair, or service of an irrigation system in accordance
with the Uniform Plumbing Code (Section 316) or the International
Plumbing Code (Section 605).
(c) When maintenance, alteration, repair or service
of an irrigation system involves excavation work at the water meter
or at a point upstream of the backflow prevention assembly, an isolation
valve shall be installed, if an isolation valve is not currently installed
per §344.62(k) of this title (relating to Minimum Design and
Installation Requirements).
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