Thursday - July 21, 2016

Final excavation and pile drilling starting soon

Crews using the hydraulic hammer.

Crews break up the clearwell foundation using the hydraulic hammer.

Crews poured the final section of concrete for the terraced seating in the rain garden area.

Water Treatment Plant Construction Update

Information about onsite work is outlined below. Please note, schedules are subject to change.

Demolition - north of site

Crews continue to work their way through the existing underground clearwell and into the foundation of the filters and administration building. Over the last few weeks, they have needed to use the hydraulic hammer more frequently to access the lower levels and break up the concrete. As neighbors know, the reverberating noise from the hammer is very loud and repetitive.

Unfortunately, demolition of the foundations has been slower than anticipated, and the contractor is now expecting to finish using the hammer mid-next week. Crews are working as fast as they can to get this final stage of demolition finished, and they will not need to use the hammer again once this activity is complete. Neighbors, thank you for your continued patience and understanding with this work.

Auger cast pile drilling and excavation – starting soon

Next week, crews plan to excavate for the ozone system and backfill the old clearwell. Over the next week, several large deliveries containing long rebar cages will arrive to the site. This is to prepare for the final stage of pile drilling for the new ozone structures. The auger cast pile drill rig and crane will also be set-up to prepare for installing the final auger cast piles.

Neighbors will notice an increase in truck traffic on Mapleton and Kenthorpe, noise and potential vibration during the excavation and auger cast pile drilling activities.

Once the auger cast piles are installed, concrete work will begin for the new foundations.

Site improvements and landscaping

This week, crews poured the final section of concrete for the terraced seating in the rain garden area. Work in the northwest area for the rain garden includes excavators digging and preparing the site, placement of materials, forming hardscaping and backfilling/compacting fill. During this work, neighbors close to the site should expect some noise and vibration from the movement of equipment.

Curbs have been poured on the Kenthorpe and Mapleton plant frontages. The east side sidewalk at the end of Kenthorpe Way, which will eventually connect the new pedestrian pathway, was also poured this week. Soon, the existing site fences along the Kenthorpe Way and Mapleton Drive plant frontages will temporarily shift to the edge of the curb, so crews can work on the new sidewalks.

Neighborhood construction meetings – next meeting August 16

Meetings are held once a month at the Robinwood Station, 3706 Cedaroak Drive, West Linn, on the third Tuesday of the month at 6 p.m. The next neighborhood construction meeting will be held on Tuesday, August 16 at 6 p.m. Please attend to stay up-to-date on construction progress in West Linn and ask the project team questions.

Work hours

Work hours are 7 a.m. to 7 p.m., Monday to Friday, and 9 a.m. to 5 p.m. on Saturday.

WTP construction tours

The next tour will be held on Thursday, July 28 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.

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.