Friday - April 11, 2014

Water Treatment Plant Construction Update

Tying rebar and preparing for a concrete pour in the gravity thickener

The auger cast drill rig is continuing to drill piles for all new structures on site, including the mechanical dewatering building and electrical building - over half of the 1,100 auger cast piles have been installed to date!

Last week, work started on backfilling the access ramps into the south side of the clearwell near Mapleton Drive. The backfilling activity requires loaders to pick up and place gravel and rock, and then use a rolling vibratory compactor to compress the fill and gravel. The compaction in this area, and the northeast of the site close to the demolished lagoons will continue intermittently over the next few weeks. Form work and concrete pouring will also continue on-site over the next few weeks, for the clearwell and ballasted flocculation columns, walls and suspended roof.

Neighbors can expect some noise and potential vibration during the fill placement and compaction, auger cast drilling and concrete sandblasting, depending on locations or personal sensitivities. Truck traffic will continue during concrete and grout pouring for the auger cast piles and new foundations.

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 Saturday, April 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.

Construction Tour Reminder

The Partnership holds free WTP construction tours on the fourth Thursday of each month at 10:00 a.m. The next tour will take place on April 24. Space is limited so please sign-up in advance to register a spot by contacting us, calling the hotline or in person at the bi-monthly meetings.

Upcoming Activities*Purpose of WorkPotential ImpactsEstimated Duration

Week of April 14 -19

1 Continue backfilling and compacting the south side access and ramp into clearwell Refill excavated area after concrete placement  Noise and vibration as compactor compresses fill and gravel - south of the site near Mapleton Drive.  2 weeks
2 Continue forming walls, columns and shoring roof support for clearwell, including concrete pouring Provide foundation to support the clearwell & temporary support for forming clearwell roof Concrete pouring, concrete trucks entering/exiting, intermittent noise from sand blasting concrete – south (Mapleton) side of site. Trucks entering/exiting with equipment, formwork.  4 weeks
3 Continue forming walls for ballasted flocculation & begin shoring roof support, including concrete pouring Provide foundation to support the ballasted flocculation & temporary support for forming roof Concrete pouring, concrete trucks entering/exiting, intermittent noise from sand blasting concrete – center of site.  4 weeks
4 Continue forming and placing concrete base slabs for solids storage tank and gravity thickener Provide foundation to support the structures Concrete pouring, concrete trucks entering/exiting, intermittent noise from sand blasting concrete – northeast of site.  1 week
5 Continue installing auger cast piles for electrical building and chemical building Piles will support the base of the structures Noise, possible vibration as drill moves across the center and northeast of site.  2 weeks
6 Continue installing underslab plumbing and electrical for chemical building and mechanical dewatering Provide plumbing and electrical wiring for structures Trucks entering/exiting with equipment to northeast of site. No anticipated new noise.  2 weeks
7 Begin potholing (digging small holes) for 42” pipeline tie-in Locate existing utilities and pipes Potential noise from small excavator, northeast of site near easterly wheel wash. 1 week

Week of April 21-25 (No work Saturday April 26) 

1  Continue backfilling and compacting south side of clearwell (see 1 above)
2  Continue forming walls, columns and support for clearwell & ballasted flocculation building (see 2, 3 above)
3  Continue installing auger cast piles east of chemical building (see 5 above)
4  Continue installing underslab plumbing and electrical wiring for mechanical dewatering (see 6 above)
5 Begin backfilling and compacting on the east side of the chemical building, near demolished lagoons Refill excavated area and prepare for auger cast piles Noise and vibration as compactor compresses fill and gravel – northeast of the site near demolished lagoons.  1 week
6 Begin forming walls for solids storage tank and gravity thickener Provides foundation to support new structure Concrete pouring, concrete trucks entering/exiting, intermittent noise from sand blasting concretenortheast of site. 3 weeks
*Please note, activity duration and schedules may change