Water Treatment Plant Construction Update
The clearwell is being prepared for installation of its dewatering system.
Last week was a fairly quiet week at the job site, with very little excavation work happening. In response to a West Linn City Council request, we are reformatting the construction update with a bit more attention to impacts of construction activities, purpose and duration of work.
The table below describes what is happening this week as well as over the next two weeks.
| Ucoming Activities | Purpose of Work | Potential Impacts | Duration |
|---|---|---|---|
| Week of October 28 | |||
| Excavate remainder of clearwell. Place fabric and crushed rock over bottom surface | Fabric/rock provides base for the auger cast pile equipment to work on. | Noise/vibration, trucks entering/exiting | 2 weeks |
| Install clearwell dewatering system | Keeps water out of clearwell during construction | Little/no noise or vibration | 1½ weeks |
| Excavate trench for temporary pipe, install pipe and backfill | Prepare trench and install yard piping | Noise, vibration, trucks entering/ exiting | 1 week |
| Install temporary power for decant pump | Existing pump is to be removed | Little/no noise or vibration | 1 week |
| Halloween – no work after 4pm | |||
| SATURDAY WORK (NOV. 2) | |||
| Week of November 4 | |||
| Continue clearwell work | ½ week | ||
| Continue dewatering work | ½ week | ||
| Excavate trench, install 48” overflow lines to easterly lagoons; form & pour encasement slab | Provide overflow line for treatment plant. | Some noise/vibration may be experienced by easterly neighbors, trucks entering/exiting | 1 week |
| SATURDAY WORK (NOV. 9) | |||
| Week of November 11 | |||
| Construct access road into clearwell for auger cast pile crane | Current road into excavation is too steep for a crane to access | Noise, vibration, trucks entering/exiting | ½ week |
| Begin drilling auger cast piles in clearwell | Auger cast piles will support the clearwell | New activity! Noise, vibration as drill moves across site | 4 weeks |
| Excavate, install temporary piping | Temporary piping required to keep plant in service while existing piping is replaced | Possible noise/vibration east & north of site | 1½ weeks |
| Install 48” overflow pipe between lagoon and treatment plant including excavation, piling, piping, and concrete encasement. | This is part of the permanent plant overflow piping | Possible noise/vibration east & north of site | 2 weeks |
| Install augercast pile on east side of site for tower crane foundation. Build crane’s concrete foundation | Provide foundation of tower crane servicing clearwell and east side of site | New activity! Possible noise, vibration as drill moves across site | 2 days |
