Logan Wastewater Treatment Plant

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.