Thursday - July 30, 2015

Concrete pours begin for the new WTP filters and administration building

New filters – northwest of site

Crews finished installing the auger cast piles for the pipe encasement and filter slabs. Rebar (pictured right) was installed to support the 54-inch pipe as part of the connection between the new filters and ballasted flocculation, and also for the new administration building. Last week, crews started installing the 54-inch pipe and next week, the new pipe will be encased in concrete. Once this is complete and the concrete forms are removed, crews will backfill the encasement slabs.

Work is also continuing to form and pour the concrete slabs for the new filters. As part of the concrete work, several trucks are arriving and departing at the site. Also, the large vibratory compactor is being used intermittently to help backfill and prepare the subgrade for the next stage of pouring concrete slabs. Neighbors close to the site should expect an increase in vibration and noise during this work.

New administration building – north of site

A lot of structural work is taking place for the new administration building. Crews are tying rebar, installing beams to intersect with the newly-installed auger cast piles, forming the base for conduit and floor drains, and pouring concrete for the grade beams and walls. Crews are also preparing the basement level and installing underground utilities (electrical conduit and plumbing). Neighbors should expect an increase in truck traffic and noise during this time.

Washwater recovery basins excavation – northwest of site

In mid-late August, a large excavation will take place for the washwater recovery basins. These will be constructed next to the new filters, and will process water and sediment that is removed from the filters which will then be recycled back into the treatment process. The excavation is expected to take about a week or so to complete. During this time, neighbors on Mapleton Drive and Kenthorpe Way should expect an increase in truck traffic. Neighbors located close to the site should also expect an increase in vibration and noise.

Please note, once the major open-cut pipeline work begins on Mapleton Drive, the WTP contractor will be using Kenthorpe Way to enter and exit the site. Neighbors on Kenthorpe should expect an increase in truck traffic during this time.

Miscellaneous piping work – east and south of site, near Mapleton Drive

Late next week through mid-August, crews expect to begin installing the 48-inch overflow pipe from the clearwell to the existing lagoons on the east of the site. This will involve excavating, forming, placing piping and backfilling the trench. Neighbors close to the site on Mapleton Drive may notice an increase in noise or potential vibration during this work.

Neighborhood construction meetings – next meeting Aug. 4 at 7:30 a.m.

The next neighborhood construction meeting will be held at Burgerville on Tuesday, Aug. 4 at 7:30 a.m. Please attend to stay up-to-date on construction progress in West Linn and ask the project team questions.

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.


WTP construction tours

The next tour will be held on Sept. 24 at 10 a.m. Tours are held every two months on the fourth Thursday (pictured left). Advance registration is required and space is limited. Please contact us and indicate in the subject line you would like to attend the next tour, along with your contact information.


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.

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 us, call the hotline at 503-697-6502, attend a neighborhood construction meeting.