All water required for flushing, testing or sterilization of service lines will be furnished by the Water Department at no cost to the contractor. The contractor will be allowed to use City water at regular meter rates for all other purposes, but before any water is used, the contractor shall notify the Water Department office. A suitable meter will be provided by the Department upon payment of the standard charge. No water shall be used other than that water required for the items listed above without a meter. Opening and closing of the fire hydrants shall be performed only by an authorized employee of the Water Department.