The government authority in Arlington, VA is seeking a qualified contractor to provide street watermain replacement services. The project encompasses the replacement of watermains, with a significant emphasis on adhering to precise concrete pouring procedures during construction.

Contractors will be required to execute concreting between manholes or other terminations in a single, continuous operation. The process must accommodate expansion and contraction of ducts due to temperature fluctuations. During the pouring phase, special care must be taken to spade concrete thoroughly to prevent the formation of voids beneath and between conduits and at exterior surfaces. Heavy masses of concrete are not permitted to fall directly onto ducts; instead, a plank should be utilized to guide the concrete down the sides to the trench bottom, enabling it to flow to the center before rising to fill open spaces uniformly. The use of power-driven agitating equipment is prohibited unless it has been specifically designed for duct-bank applications.