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CH2M HILL Chosen by City of Minneapolis to Deliver North America's Largest Pressurized UF Drinking Water Plant

CH2M HILL Chosen by City of Minneapolis to Deliver North America's Largest Pressurized UF Drinking Water Plant

MINNEAPOLIS, 18 October, 2006 — CH2M HILL, a global full-service engineering, construction, and operations firm, has been unanimously selected by the City of Minneapolis to design, manage construction and commission the Fridley Membrane Filtration Plant (FMFP).

The plant, when completed, will be the largest drinking water plant in North America using pressurized ultrafiltration (UF) membrane technology, having a capacity of 95 million gallons of water per day (mgd).

The FMFP is the next phase of Minneapolis Water Work's ongoing program to upgrade their water treatment facilities in order to provide the citizens of Greater Minneapolis with the highest quality drinking water through the use of membrane technology.

The Fridley Membrane Filtration Plant will utilize a pressurized membrane system to be supplied by Pall Corporation. The Pall system uses banks of Microza™ modules that filter water through hollow fibers, providing a robust, physical barrier to waterborne pathogens and other particulate contaminants that may be present in the plant source water.

The FMFP capacity will range from 70 to 95 mgd, resulting from the variable raw water temperatures experienced in Minneapolis. The plant will be integrated into the overall treatment works that include conventional lime softening, recarbonation, coagulation, flocculation and sedimentation prior to the membranes. The plant is expected to be fully operational in 2011.

CH2M HILL has implemented membrane technologies for several drinking water plants across the country. In addition to the FMFP, the company is currently completing design and construction of the 100-mgd Twin Oaks Valley Water Treatment Plant in northern San Diego County and the 96-mgd expansion to the Lakeview Water Treatment Plant in the Greater Toronto, Ontario area. Both of these plants incorporate ultrafiltration along with other advanced treatment technologies, and with the FMFP, represent the three largest ultrafiltration-based treatment facilities in the world.

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