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May 2017

Manganaro Lift Station Wins Wastewater Collection Project of The Year

CHANDLER, AZ - The City of Chandler Manganaro Lift Station Improvement project was named the Wastewater Collection Project of the Year by the Arizona Associated General Contractors of America. Built by Archer Western, the project team demonstrated exemplary alternate project delivery of important wastewater collection system improvements, and was mindful of the lifetime impacts on the City of Chandler, its residents, and the surrounding businesses. As the team collaborated on solutions to the project challenges, Archer Western and Wilson Engineers delivered pre-construction and construction services for the client and contributed to the community’s future success.

The City of Chandler inherited the Manganaro Lift Station and noticed deteriorating conditions inside the lift station wet well and adjacent influent and discharge manholes. The wet well, only 15 feet long by 12 feet wide, and nearly 45 feet deep, houses four submersible pumps. At least three of the pump discharge pipes had significant holes, therefore gushing sewage back into the wet well when in operation. The discharge sewer manhole showed heavy signs of corrosion including multiple areas of T-lock failures.

Archer Western served as construction manager at-risk for this $1.7 million rehabilitation project. The scope of work included replacing all pump discharge piping, spot repairs to the wet well protective coating, rehabilitating the influent and discharge manholes with FRP inserts and the installation of a magnetic flow meter inside a new concrete vault.

The rehabilitation effort also included newer material and installation technologies. The discharge pipe and drop sewer connection at the discharge manhole was made exclusively of HDPE material to avoid any future corrosion. Another advantage of HDPE pipe was the ability to use several custom-made HDPE fittings as well as electrofusion technology to make a tailored pipe assembly. The manholes were also rehabilitated using newer and long-lasting materials such as FRP manhole, FRP insert and FRP covers.

The Archer Western team completed the project under budget while maintaining operation of the facility.



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