Friday - March 13, 2015

Startup of solids structures underway at the WTP

Pipe installation on the east of the site

Screw presses

Water Treatment Plant Construction Update

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

New administration building – north of site

The contractor expects to begin working on the foundation of the new administration building soon, which will be located next to the existing administration building and in the current parking lot off Kenthorpe Way. Next week, crews will begin removing some of the landscaping on the north side of the existing plant parking lot, laying down gravel and creating a temporary parking lot for the plant staff. Neighbors close to site on Kenthorpe Way may notice an increase in noise or potential vibration during this work.

Miscellaneous piping work – east of site

In late February, crews installed the 42 in. raw water pipe and this week they began installing the 48 in. finished water pipe on the east of the site. This work involves excavating the trench, pouring a slab, placing the pipe, encasing it in concrete and then backfilling the area. Neighbors close to the site may notice an increase in noise or potential vibration during this work.

Finished water pump station – center of site

Last month, crews installed the pan-decking and roof trusses. Over the next few weeks, crews will continue installing the roof drain piping and chemical piping inside the structure. Neighbors close to the site may notice noise from the scissor lifts operating within the structures.

Chemical & electrical buildings – center of site

This week, roll up doors were installed on the chemical building. Chemical piping systems and fire sprinklers were also installed. Work will now begin on the HVAC system.

Brick veneer, siding panels and roof panels are now complete for the electrical building. Over the next few weeks, crews will install the roll up doors and the solar panels.

Ballasted flocculation – center of site

Crews are framing temporary walls on the western end of the structure. Work continues on the roofing insulation and roof panels. Plumbing and chemical piping continues to be installed within the structure.

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

Metal panels, siding panels and brick veneer are now complete for the solids storage building and mechanical dewatering building. Roll up doors are being installed on the mechanical dewatering building over the next week.

The startup and commissioning of these structures is underway, 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. The mechanical dewatering structure houses screw presses, which remove the remaining water from the solids (screw presses pictured above).

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 March 17

The next meeting will be March 17, at 6p.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 or attend a bi-monthly meeting at Burgerville.