Washington

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    Brightwater Wastewater Conveyance

    In response to rapid population growth in King and Snohomish counties, a new regional wastewater treatment plant was designed to treat an average of 36 million gallons of wastewater a day, impacting nearly 190,000 people. King County selected a joint venture including MWH to provide final design services for the conveyance portion of the new […]

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    Green River Filtration Facility

    The City of Tacoma, Washington selected MWH Global to design a new water treatment facility that combines direct filtration and conventional treatment at the same location, to better manage the challenges in dealing with a mountain river source and vastly differing water qualities between summer and winter.

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    Holden Mine CERCLA Remedial Design/Remedial Action

    MWH is the Engineer of Record for this world class mine reclamation project providing environmental management, detailed design and construction oversight services. The Holden Copper Mine is a multi-year $500 million legacy mine reclamation project currently underway in the northwest United States.  

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    Lake Chelan Hydro Modernization Project

    The Lake Chelan Hydroelectric Project was originally built in 1928 with two 30 MW vertical-shaft Francis turbine generating units. Equipment age and condition of the generating equipment, and lower than expected operating efficiencies, led Public Utility District No. 1 of Chelan County (District) to retain MWH as part of an integrated team to undertake a […]

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    Tacoma Central Treatment Plant Upgrades

    The City of Tacoma selected MWH to design and build the modification and expansion components to its existing Central Treatment Plant. The project included numerous improvements to the wastewater treatment plant.