Thursday - May 21, 2015

Demolition work continues at the treatment plant

Placing rock and preparing the subgrade

Water Treatment Plant Construction Update

Sedimentation basin demolition – northwest of site

Demolition of the basins and alum room is progressing well, and the crushing of the stockpiled concrete started this week. Crushing the material on site for later reuse reduces truck traffic in the neighborhood.  

Over the last week or so, crews have needed to use the hydraulic hammer more frequently to break up the concrete in the base of the foundation. Unfortunately, this is a very noisy activity. Crews are aiming to be done with most of the demolition mid-next week, and are trying to use the concrete processors (jaws) as much as possible, which are not as noisy as the hammer. Demolition crews are working six day weeks (Monday through Saturday), and averaging 10-hour days, to help get the work finished sooner. We appreciate everyone’s patience during this noisy activity.


Pictured from left to right: rebar removed and stockpiled, concrete stockpiled for crushing, hydraulic hammer and concrete processors operating in the foundation of the sedimentation basins

New filter excavation – northwest of site

The new filters will be constructed where the sedimentation basins were previously located. Once demolition is complete, crews will begin excavating for the filter foundation and preparing for the installation of auger cast piles. Excavation is expected to take about two weeks. Neighbors may notice an increase in truck traffic, noise and potential vibration during this work.

New administration building – north of site

The 60 auger cast piles are now installed to support the foundation for the new administration building. Crews are now placing rock and preparing the subgrade (pictured top) before work begins on forming the elevator pit and pouring concrete for the foundation. Neighbors close to the site, or on Kenthorpe Way, may notice an increase in noise during this time. 

Finished water pump station, chemical and electrical buildings – center of site

Architectural (roofing) and structural siding is ongoing for the finished water pump station, chemical and electrical buildings, although this is weather dependent.

Miscellaneous piping work and surge tank installation – east and center of site

Work continues on excavating, forming, pouring concrete and placing piping in the east and center of the site. The large surge tank arrived this morning and is being installed today, which will connect to the newly installed piping to the finished water pump station.

Neighborhood construction meetings – next meeting June 2 at 7:30 a.m.

The neighborhood construction meetings will continue to be held twice a month.

Meeting schedule:

  • The first Tuesday of the month at 7:30 a.m., at Burgerville, 18350 Willamette Drive, West Linn.
  • The third Tuesday of the month at 6 p.m., at the Robinwood Station, 3706 Cedar Oak Drive, West Linn.

The next meeting will be June 2 at 7:30 a.m. in the downstairs area at Burgerville. Please attend to stay updated on construction progress in West Linn and ask the project team questions.

Work hours

Work hours are 7 a.m. to 7 p.m., Monday to Friday, and 9 a.m. to 5 p.m. on Saturdays. There will be no work on Memorial Day, Monday, May 25.

Site plan and glossary

Please refer to the site plan for locations of each structure or our glossary of terms for construction and operation of the WTP.

For more information, please email, call the hotline at  503-697-6502, or attend a neighborhood construction meeting.