Friday - May 9, 2014

Water Treatment Plant Construction Update

Installing plumbing and electrical under the slab for the chemical building

Form work and concrete pouring is continuing on-site for the clearwell, ballasted flocculation, gravity thickener, chemical building, mechanical dewatering and electrical building. Refer to the current site plan for locations of each structure.

Next Wednesday, May 14, the plant will be temporarily shut down to allow the contractor to cut into existing piping and install new fittings and valves near the mechanical building, on the northeast of the site. Neighbors can expect a new noise during the pipe cutting, which will occur in the morning hours. The work is expected to take one day to complete.

Over the next three Saturdays, firefighters from Clackamas Fire District #1, Tualatin Valley Fire & Rescue and the Lake Oswego Fire Department will be conducting training at the construction site with the contractor, Slayden. Neighbors may notice cranes lifting equipment, rope rescues from the tower crane, firefighters on-site, fire trucks and rigs arriving and leaving. Training will occur between 9 a.m. and 4 p.m. on May 10, 17 and 24. There may be some intermittent noise from back-up alarms when the rigs arrive to the site and idling of trucks, but this will be minimal. No sirens, jackhammers or invasive equipment will be used during the training.

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.

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.

Upcoming Activities*Purpose of WorkPotential ImpactsEstimated Duration

Week of May 12-May 17

1 Continue forming shoring roof support for clearwell and applying waterproof coatings Provide temporary support for forming clearwell roof & waterproofs walls Trucks entering/exiting with equipment, formwork. Some intermittent noise from pressure washer on north side of clearwell, but less noisy than sand blasting. 2 weeks
2 Continue forming walls for ballasted flocculation, solids storage tank and gravity thickener & shoring roof support, 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 Continue installing electrical conduit under the slab for electrical building Provide electrical wiring for structure Trucks entering/exiting with equipment to center of site. No anticipated new noise. 2 weeks
4 Begin forming slabs and 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
5 Begin 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 equipment, formwork. 2 weeks
6 Excavate for new piping and cut into existing piping to install new fitting and valves Install connections for temporary raw water supply pipe to plant NEW ACTIVITY! New noise during pipe cutting on May 14, in morning hours. 1 day for connection - May 14
7 Fire and rescue training with Clackamas Fire District #1, TVF&R & Lake Oswego Fire Department on-site Provide opportunity for fire crews to perform technical rescue training to respond to emergencies Noise from back-up alarms on rigs & idling of trucks, trucks and rigs entering/exiting, cranes lifting equipment. 1 day –
May 17

Week of May 19-24

1 Continue activities from 1- 5 above.
2 Continue fire and rescue training – May 24 (see 7 above)
3 Begin excavating and installing shoring for 54” pipe Prepare for installation of piping Trucks entering/exiting, potential vibration and noise - the center of site. 1 week

*Please note, activity duration and schedules may change