Friday - January 16, 2015

Water Treatment Plant Construction Update

Steel frames for new roof

Building tented for coating

Work occurring on site over the next few weeks includes:

Ballasted flocculation – center of site

Mechanical equipment continues to be installed within the structure. Steel frames have been installed as part of the ballasted flocculation roof system (pictured right). Crews are now beginning to place insulation and roof panels.

Solids storage building and mechanical dewatering building – northeast of site

Electricians are installing conduit and fixtures, and working on the HVAC system for the solids storage building. Next week, siding panels should be complete.

Starting next week, crews will place brick veneer for the mechanical dewatering building and begin working on the roof system. Once this is complete, siding panels will be applied. Electricians continue to install lighting and electrical fixtures through the month.

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

Crews continue to install structural support, roof joists and mechanical piping for the finished water pump station.

Work has begun on forming stairs inside the clearwell. The coating application to the exterior of the clearwell has slowed as it is dependent on dry weather and temperatures above 40F. However, crews have been able to progress this past week and expect to begin backfilling the area around the outside of the clearwell in the next week. Backfilling of the clearwell is expected to take several weeks to complete, and will require the use of the large vibratory compactor at times over the next month, to compress the fill and gravel. Neighbors located close to the site and south of the site on Mapleton Drive can expect an increase in vibration during the fill placement and compaction of the clearwell.

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

Piping, vault and conduit work continues on the east of the site, near the solids storage building and clearwell, and the center of the site, in between the chemical building and ballasted flocculation. Neighbors close to the site may notice an increase in vibration during the excavation and backfilling as part of this work.

Chemical & electrical buildings – center of site

Structural steel, decking and framing are being placed for the chemical building. Last week, the building was tented and coating was applied to exterior of the concrete blocks (pictured above). Work will soon begin on installing the brick veneer.

For the electrical building, the roof insulation and wall framing have been placed. Crews will soon begin working on part of the HVAC system. Over the next week, the electrical building will be tented to allow weather barrier coatings to be applied in dry conditions. Once the coating is complete, work will begin on installing the brick veneer.

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 January 22, 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 Jan. 20

The next meeting will be January 20, 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 questions of the project team. All meeting materials are posted online under “past meetings and events.”

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