Thursday - May 22, 2014

Water Treatment Plant Construction Update

Preparing for the final wall pour for the gravity thickener building this week

This week, the final wall was poured for the gravity thickener building on the northeast of the site. Crews also began to excavate and install shoring for a new 54” pipe to connect the clearwell and filters. An additional office trailer was also delivered to the site and set up near the existing office complex.

Walls are almost complete in the ballasted flocculation and continue to be poured for the solids storage tank and mechanical dewatering structures. Next week, auger cast pile drilling will resume on the center of the site, to support the new 54” pipe. Refer to the current site plan for locations of each structure.

Over the next few weeks, the clearwell and ballasted flocculation roof slabs will be poured in a checkerboard pattern. The first pour for the clearwell and ballasted flocculation is scheduled for late next week. Waterblasting or sandblasting of the edges of the newly poured slabs will occur within one or two days of a roof pour. Neighbors close to the site on Mapleton Drive and Kenthorpe Way may experience intermittent noise during the sandblasting. Truck traffic will continue during concrete pouring for new structures.

Over the last two Saturdays, Clackamas Fire District #1, Tualatin Valley Fire & Rescue and the Lake Oswego Fire Department have been conducting training (link connects to external site) at the construction site with the contractor, Slayden. The final day of training will occur this Saturday, May 24. There may be some intermittent noise from back-up alarms when the rigs arrive to the site, but this will be minimized.

Work hours are Monday to Friday from 7:00 a.m. to 7:00 p.m. and Saturdays, from 9:00 a.m. to 5:00 p.m. There will be no work on Memorial Day, May 26.

For more detail about what activities are happening on site please see the table below. We apologize for the inconvenience construction may cause and thank you for your patience as work progresses.
For more information, please contact us, or call the hotline at 503-697-6502.

Upcoming Activities*Purpose of WorkPotential ImpactsEstimated Duration

Week of May 27-May 31

1 Continue forming shoring roof support & begin concrete pouring for clearwell and ballasted flocculation Provide upper covering for the structures Trucks entering/exiting with equipment, formwork. Some intermittent noise from blasting concrete - south (Mapleton) and center of site. 2 weeks
2 Continue forming walls and begin shoring roof support for solids storage tank, including concrete pouring Provide foundation to support the structures & temporary support for forming roof Concrete pouring, concrete trucks entering/exiting, intermittent noise from sand blasting concrete – center & northeast of site. 3 weeks
3 Begin installing forms for the trough inside the gravity thickener Captures treated water overflows from clarifier  No new noise. Trucks entering/exiting and concrete poured - northeast of site. 2 weeks
4 Continue forming lower slabs for chemical building and installing rebar Provide foundation to support the structure Concrete pouring, concrete trucks entering/exiting, intermittent noise from sand blasting concrete – northeast of site. Trucks entering/exiting with equiptment, formwork. 2 weeks
5 Continue installing electrical conduit under the slab for electrical building Provide electrical wiring for the structure Trucks entering/exiting with equipment – center of site. No anticipated new noise 3 weeks
6 Begin forming walls for mechanical dewatering, including concrete pouring Provide foundation to support the mechanical dewatering building Concrete pouring, concrete trucks entering/exiting, intermittent noise from sand blasting concrete – northeast of site. 3 weeks
7 Begin installing auger cast piles for 54" pipe to connect clearwell and filters Auger cast piles support the base of the pipe Noise as drill moved across the center of site. 1 week

Week of June 2 - 7

1 Continue activities from 1- 6 above.
2 Backfill and compact for chemical building, prior to installing conduit Refill area and prepare for installation of conduit  Vibration and noise, as compactor compresses fill and gravel - northeast of site. 2 days
3 Begin installing rebar and slabs for 54" pipe encasement Support the new pipe No new noise. Concrete pouring, trucks entering/exiting - center of site. 1 week

*Please note, activity duration and schedules may change