MWH constructed a new, greenfield, 18 MGD wastewater plant for the City of Logan at the Logan Regional Wastewater Treatment Facility. It is currently the largest ballasted clarification wastewater facility in the world. MWH partnered with Carollo, the City of Logan, and over 40 subcontractors and vendors to successfully construct and commission a plant with a process that had not been implemented to this degree in the industry.
The project included a new headworks with fine screens, grit removal vortexes, and influent pumps. The raw water was then pumped over a mile to the rest of the treatment facility. This includes bioreactors, clarifiers, ultraviolet disinfection, solids storage, dewatering, and the BioMag (Evoqua) systems. The new award-winning structures are supported on deep pile foundations and interconnected with complex yard piping.
MWH’s initial estimate was$171M, which was consistent with the scope of work and validated by supporting supplier and subcontractor quotes. However, to provide value to the owner, MWH led multiple value engineering workshops with the project team and identified innovative solutions that reduced the total cost by $32M.
Value engineering was not the only part of this project that exhibited our problem-solving approach. In Logan, Utah, the harsh winter season presents a unique challenge for construction due to an inversion that traps frigid temperatures in the Cache Valley. MWH’s savvy construction team at Logan strategically modified their sequence to overcome this obstacle to ensure the project was executed safely and efficiently.
“MWH was instrumental to our project as initial project costs greatly exceeded our preliminary budget. Through collaboration between us all, the value engineering efforts that MWH completed yielded more than $20M in savings! A true success.”
This $110M Construction Manager-at-Risk (CMAR) project was awarded to MWH by the North Texas Municipal Water District. It consists of four phases and requires the coordination of three separate design teams (Jacobs, Carollo, and HDR).
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MWH is continuing to work uninterrupted on the Biosolids Digester Facilities Project (BDFP). The long-term, largescale project represents a significant overhaul of the Southeast Treatment Plant, San Francisco’s largest wastewater pollution treatment plant. BDFP is set to redefine the way wastewater is treated in the city, aiming to process up to 800 million gallons per day (MGD) and serving about 80% of the city’s population. Implementing state-of-the-art technologies and innovation, the project underscores MWH’s commitment to environmental sustainability and urban rejuvenation. The revamped plant will set new standards in waste management and pollution control, marking a major milestone in San Francisco’s environmental management history.
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MWH was awarded the 2023 ENR Intermountain Award of Merit in the Water and Environment category for the Logan Regional Wastewater Treatment Facility (WWTF). The award recognized the team’s hard work and dedication in completing the largest single capital improvement project for the City. Lance Ota, Project Manager, graciously accepted the award on behalf of the team.
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