Thursday - September 24, 2015

Large excavation complete for the WTP’s current construction phase

Excavators work their way from the southern corner to the northern corner, completing the final large excavation for this phase of work at the plant.

A crewmember ties and prepares rebar for the filter walls. In the background, a pumper truck pours concrete for a new wall.

Crews placing a layer of asphalt/tar over the roof.

Water Treatment Plant Construction Update

Washwater recovery basin – northwest of site

Work is underway on the washwater recovery basin, which is being constructed next to the new filters. Last week, crews installed the first half of the “soldier piles,” as part of a shoring system for a sump on the south end, using a vibratory method. This work took less than a day and resulted in minimal noise and vibration. The last half was installed today. Auger cast pile drilling for the second half of the basin will begin tomorrow and be completed early next week. After this series of activities are finished, a layer of gravel will be placed to create a working surface and crews will begin forming and pouring the slabs.

This week, crews made great progress excavating the last portion of the washwater recovery basin, finishing in just under two days. This marks the final large excavation for this phase of work! Thank you to neighbors for your patience during this activity and increase in two-way truck traffic on Kenthorpe Way, Old River Road and Cedaroak Drive.

REMINDER: Two-way truck traffic will continue on Kenthorpe Way during pipeline work on Mapleton Drive.

New filters – northwest of site

Several large concrete pours have been taking place for the new filter walls and slabs. Electricians finished installing the in-slab electrical conduit for the new slabs. Concrete work for the filters, washwater and administration buildings will progress over the next few months. As part of the concrete work, several trucks are arriving and departing the site. A few days after each pour, the edges of the newly-poured concrete slabs and walls are either waterblasted or sandblasted. Neighbors close to the site on Mapleton Drive and Kenthorpe Way may experience an increase in intermittent noise during this activity.

Administration building – north of site

Over the last two weeks, crews started pouring concrete for the walls and elevator shaft for the new administration building. In the coming weeks, crews will begin installing structural steel for the administration building, using the new mobile crane that arrived on site this week.

Clearwell waterproofing – south of site

Earlier this week, a waterproof coating was applied to the clearwell roof, which involved crews placing a layer of asphalt/tar over the roof (pictured left). A gravel layer will soon be placed over the asphalt, before final restoration occurs later next year.

Did you know?

There are several green design features and sustainable construction methods being implemented at the new water treatment plant, including a large solar panel array, garden roofs and energy efficient pump motors. Read more about the features here: http://www.lotigardwater.org/?e=749

Neighborhood construction meetings – next meeting Oct. 6 at 7:30 a.m.

The next neighborhood construction meeting will be held at Burgerville on Tuesday, Oct. 6 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.

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 contact us or attend a neighborhood construction meeting.