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.”
The MWH Breckenridge Conference featured 13 insightful presentations, recognizing standout contributions in engineering, innovation, and project leadership. Two teams were selected to join Obayashi’s training program in Tokyo.
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Earlier this year, the City of Saco selected MWH as the Construction Manager At-Risk for the $50M Water Resource Recovery Facility Upgrade project. The project consists of a new treatment building with aerobic granular sludge treatment processes, secondary filtration, and UV disinfection with upgraded grit removal and solids handling, as well as the conversion of existing clarifiers for additional stormwater storage and site grading alterations to mitigate tidal flooding from the adjacent Saco River.
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After a year of meticulous planning and excited anticipation, MWH’s Phoenix Team moved into their new office on June 1, 2023. Let’s take a look around!
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