Val Vista Transmission Main Rehabilitation And Replacement

The Val Vista Transmission Main Rehabilitation and Replacement project, delivered in seven GMP’s, was the largest project of its kind in the United States., The project was developed to trenchlessly rehabilitate a critical piece of infrastructure that transports 220 MG of drinking water to as much as 60 percent of the population in Phoenix, Arizona. The project involved the rehabilitation of 30,000 feet of 96-inch to 72-inch prestressed concrete cylinder pipe by means of a split-can, steel slip lining.

The project included multiple 92- to 96-inch diameter valve replacements and new installations, flow monitoring and metering with remote telemetry, vaults and manholes, disinfection and dewatering systems, the installation of 48-inch steel pipe to existing pump station facilities, landscaping, surface restorations, traffic control, extensive public outreach and multiple agency coordination. All welding was performed by a subcontractor with Quality Assurance provided by Kiewit. The project was successfully completed with zero recordable accidents, ahead of schedule in all phases, and under budget by more than $1.1 million. The project has received several industry awards.