Water Main and Valve Installation, Replacement, and Emergency Repairs

Project Owner: City of Chandler
Delivery Method: Job Order Contracting
Construction Dates: 09/17 to 09/21

This job order contract involves water main and valve installation and replacement as well as emergency repairs. The scope of work includes general construction services (and engineering services as necessary) on major and minor projects that encompass new construction, reconstruction/renovation, repair, rehabilitation, addition, demolition, and other alterations to City infrastructure.

Job Order #1: Achen-Gardner Construction cut and plugged an 8” water line located within the Chandler Municipal Airport.

Job Order #2: The scope of this job order initially involved performing emergency clean-up and channeling of water flowing from a break in a 36” water line. Additionally, we provided investigative and assessment services to identify the exact location of the break, condition of the pipe and special fittings, and performed repairs. The initial break assessment resulted in additional findings that the original pipe installation did not meet specifications and standards, so additional joint and pipe assessment was performed on the existing 36” and 30” water lines installed under the Loop 101 and Loop 202 freeways and at three access locations. The following pipe assessment of 2,500 LF of 30” pipe, 36” pipe and repair services were provided: interior pipe video, joint seal/repairs, pipe segment replacements, fabrication and installation of manways and new valves, fabrication of special fittings and field welding of components/pipe, and confined space access and monitoring. Final scope also included the fabrication and installation of one 36” valve and tee with manway and 60” manhole, and two 30” valves and tees with manways and 60” manholes.

Job Order #3: Achen-Gardner Construction replaced 27 valves (12” to 6”) in various locations identified by the City. As part of the scope of work, we coordinated with City staff to define water shutdown plans, identified the stakeholder boundaries of the shutdowns and provided a stakeholder coordination/notification plan and schedule, and performed valve replacements and restoration of the affected areas.

Job Order #4: This project consists of the replacement of large diameter piping at the Pecos Surface Water Treatment Plant to support a future surge control system. The accelerated schedule requires work to be completed during the annual plant shutdown.

Job Order #5: This project includes replacement of more than 500 LF of 8" water main in Wall Street from Frye Road to Chicago Street. Wall Street in this area is narrow and provides access points for several local businesses. We coordinated with these businesses to ensure alternate access routes were provided and the area was safe for employees and customers. The project also includes 15 water service connections and the relocation of 10 water meters, 7 backflow preventers, other appurtenances, and the bracing of APS overhead power poles due to proximity to the trench alignment.