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LOT project reaches 'final phase'

Demolition of old filters, administration building underway


TIDINGS PHOTOS: VERN UYETAKE - The 1968 administration building has sat adjacent to the new building as it went up but before summer's end all trace of the older structure will be gone. Final phase.

At one point, residents and government officials alike may have felt as if those two words would never be associated with the Lake Oswego-Tigard Water Partnership (LOT) project in West Linn. But the beginning of June marked the start of the third and final phase of construction at the LOT water plant in the Robinwood neighborhood, and busy months lie ahead for the construction team.

“The new filters were recently commissioned and the plant now has capacity to treat and deliver 32 million gallons a day,” LOT spokesperson Katy Kerklaan said. “Plant staff have relocated into the new administration building, and are operating the plant from the new structure, which houses the control room, laboratory and offices for staff.”

Kerklaan added that the water plant is now delivering water to both Lake Oswego and Tigard.

The $250 million project, which was approved in 2013, is designed to upgrade and increase system capacity to deliver drinking water from the Clackamas River to Lake Oswego and Tigard, while also providing a seismically secure source of emergency water for West Linn. As part of a land use agreement with the City of West Linn, LOT paid the city $5 million, which it opted to use for the replacement of the 100-plus year old Bolton Reservoir — West Linn’s primary water storage unit. Construction of that reservoir began earlier this year.

In December 2014, the Slayden Construction Group announced that the expansion and replacement of the LOT water plant in West Linn would be delayed by almost a full year. No other major delays have occurred since that point.

TIDINGS PHOTO: VERN UYETAKE - It has been a demolition-heavy month at the LOT site as the project moves into its final phase.

The project reached the 60 percent completion mark in late March. Demolition of the old administration building and filters began in June, and will likely continue until early to mid-July.

“(Last) week, the demolition crews started on the exterior components of the administration building,” Kerklaan said. “They expect to start on the foundations of both structures as early as (this) week. This may require crews to use a hydraulic hammer to break up the concrete, which is a very noisy activity. … They are doing their best to minimize use of the hydraulic hammer.”

Following the demolition process, LOT will begin construction of the final two structures slated for the water plant: an ozone generator and ozone contactor.

“Auger cast pile drilling will resume on the final piles,” Kerklaan said. “Once the piles are complete, they will work on forming the foundation and pouring concrete.”

General site improvements are also scheduled for the near future, according to Kerklaan.

“Over the coming weeks, this includes a curb and gutter on the Mapleton Drive and Kenthorpe Way plant frontage, excavation and installation of a rain garden in the northwest corner of the site, sidewalks and hardscaping around new structures and installation of site walls,” Kerklaan said.

Patrick Malee can be reached at 503-636-1281 Ext. 106 or This email address is being protected from spambots. You need JavaScript enabled to view it..