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Construction Sequencing and Methods
The contractor shall follow standard water main installation procedures and methods.
The contractor shall not shut down the plant water system at any time. The plant water is
used for process control, seal water and cooling of a gas generator. Only the City may
shut down the plant water provided adequate means are in place for continuing the
processes that need plant water.
The majority of the work specified can be accomplished without shutting down the plant
water system after the isolation valves are installed. It may be necessary to use pipe
freezing methods for some valves should the City determine that the isolation valve
cannot be shut off for reasons stated above.
The contractors should schedule pipe freezing techniques, if required,
Warranty
A standard one-year warranty shall be in effect. Should any leak occur during the one-
year period it shall be fixed immediately since plant water is being used. Immediately
means with 4-6 hours of when the leak occurs.
The one-year warranty period shall begin upon substantial completion. Substantial
completion means all valves, yard hydrants and gate valves have been installed and
pressurized to verify there are no leaks.
Should the contractor be unable to make the repair in a timely manner, the City reserves
the right to hire a contractor or Pennichuck Water Works emergency repair crew to
complete the repair. The contractor will pay for the costs of such a repair should it
happen within the one-year warranty period.
Should any trench settling occur the contractor will come back near the end of the one-
year warranty period and fill/recompact the trench unless specified otherwise by the City.
If the settling occurs in paved areas the contractor shall refill/recompact in a timely
manner depending on the severity of the settling.
