(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).     
     Source Note:        The provisions of this §344.64 adopted to be effective January 1, 2009, 33 TexReg 5713; amended to be effective July 26, 2020, 45 TexReg 4986