Thursday - February 12, 2015

New chemical tanks installed at the WTP this week

Chemical tanks

Clearwell is almost complete

Work occurring on the new structures and across the site includes:

Chemical and electrical buildings - center of site

Crews finished applying the protective coatings on the interior of the chemical building and, this week, installed six large chemical tanks within the structure (pictured right). Work will now begin to install chemical piping systems and electrical connections.

For the electrical building, crews have installed the lower level of the HVAC system and electricians are working inside the structure. Over the next few weeks, crews will begin placing the brick veneer, siding panels, and roof panels.

Ballasted flocculation – center of site

Crews are placing structural steel and roof panels. Plumbing and piping continues to be installed within the structure.

Miscellaneous work: piping, conduit and vaults - east and center of site

This week, a crane with a drill rig arrived on site to prepare for auger cast pile drilling. Next week, crews will resume drilling auger cast piles to support piping on the east of the site, near the clearwell. More than 600 piles have been installed on site to date. Neighbors close to the site may notice an increase in noise or potential vibration during this work. In late February, work will begin on installing the 42 in. raw water pipe and 48 in. finished water pipe on the east of the site. Crews will excavate the trench, place the pipe and backfill the area.

Finished water pump station and clearwell - south and center of site

This week, concrete was poured for the roof slabs on the finished water pump station. Crews are now forming the roof drains, skylights and irrigation. Chemical and plumbing piping continues to be installed.

Crews are making good progress with backfilling the south side and west sides of the clearwell, and expect to be complete this week (pictured above). Work continues on forming and installing stairs for the structure.


Solids storage building, mechanical dewatering building and gravity thickener – northeast of site

Electricians are almost finished installing conduit and fixtures for the solids storage building. Interior coating is being applied to steel and piping within the structure. Roofing is now complete for the mechanical dewatering building, and crews are working on the siding panels.

The startup and commissioning of these structures will begin soon, which all play a role in the solids removal process. Solids consist of soil or sediments from the river, and the alum that was used to remove the soil from the water.

Work hours

Work hours are Monday to Friday from 7 a.m. to 7 p.m. and Saturdays from 9 a.m. to 5 p.m.

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.

WTP construction tours

The next tour will be held on March 26, at 10 a.m. Tours are held every two months, on the fourth Thursday. 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.

Neighborhood construction meetings – next meeting is February 17

The next meeting will be February 17, at 6 p.m. in the downstairs restaurant area at Burgerville, 18350 Willamette Drive, West Linn. Please come along to stay updated on construction progress in West Linn and ask the project team questions. All meeting materials are posted online under “past meetings and events.”

For more information, please contact us, call the hotline at 503-697-6502, attend a bi-monthly meeting at Burgerville.