MWH and Slayden Constructors worked with the City of Spokane to achieve major upgrades to their Riverside Park Water Reclamation Facility. The upgrade included a Next Level of Treatment (NLT) - a new membrane filtration system that significantly improved the quality of effluent released into the Spokane River. The primary reason for the NLT was to decrease 99% of the phosphorus from the effluent. The new filtration system also removed more significant amounts of heavy metals, PCBs, and other pollutants associated with the facility. The advanced membrane filtration technology provides pollution reduction benefits and is designed to treat an average wastewater flow of 50MGD. The NLT upgrade is part of a major initiative to improve the health of the Spokane River.
The project included 7 GMP’s to balance early construction with design evolution as well as procurement of long lead equipment. Phase 1 included upgrades to the existing facility including: SCADA upgrades, new primary clarifier, new chemical storage facility, modifications to 4 aeration basins, and digester gas improvements.
Phase 2 consists of installation of a 75MGD peak flow tertiary treatment facility that included:, new diversion structure, new drum screen structure for 18’ diameter drum screens, new flocculation basins, new membrane pump wet well and a new membrane facility.
“This was the City’s fist alternative delivery project and we found that we received tremendous value during preconstruction. MWH/Slayden provided extensive value engineering and constructability ideas that resulted in $9.1M in accepted savings. Their experience in wastewater projects led to a good understanding of project details resulting in the project operating within the allocated budgets.”
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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