A. 
Where excavating machines are used in digging sewers, all water mains shall be maintained at the expense of the contractor.
B. 
Contractors must ascertain for themselves the existence and location of all water mains and service pipes. Where removed, cut, or damaged during trench excavation, the contractors must, at their own expense, cause them to be replaced or repaired at once. Contractors must not shut off the water service pipes to any consumer for a period exceeding six hours.
Trenches in unpaved streets shall be refilled with moist, damp earth or by means of water tamping. When water tamping is used, the water shall be turned into the trench after the first 12 inches of backfill has been placed and then the trench shall be kept flooded until the remainder of the backfill has been put in.