Scope of Work:
Portland General Electric is investing in modernizing their hydroelectric supply system in Clackamas County, Oregon. The Faraday Powerhouse project involves the removal and replacement of the main powerhouse, as well additions to improve generation efficiency and to address long-term operational safety.
Central worked directly with the project subcontractors to accomplish the improvements within our scope of work, which included assisting in the design and construction of the long-term erosion control measures located upslope of the new powerhouse construction. With construction already underway, we were to provide additional design and analysis needed directly to the contractor under the guidance of the existing design team.
- Design during construction operations
- Strong coordination between design team and construction contractor
- Difficult terrain, steep slopes
- Mapping, sequencing, and specifications provided
- Recommendations for testing procedures and installation of erosion control product
Our portion of the project was upslope from the powerhouse along the dam, where the new penstock foundations were being placed. Steep slopes and difficult access were involved on this site. Stephen Eagar, PE led the coordination through multiple site meetings and phone conferences with the contractor, vendor, and geotechnical design team. Paul Crenna, CEG, LEG, LHG provided technical review and analysis of the proposed solutions, along with the slope stability feasibility of each design alternative provided.
Samples of surrounding soils and rock were taken for analysis in our in-house soils laboratory. Testing confirmed the need for additional coordination with the product vendors, the site Structural Engineers, and the site Contractor. Mapping of site features and installation areas were completed, and specifications were written for the erosion control aspects of this upper slope.