- Agency: U.S. Army Corps of Engineers
- Contract Price: $1,700,000.00
- Completion: 1997
- Key Elements: Soil Cement Bentonite Slurry Wall, Bio-Polymar Relief Trench
The Sutter Bypass S-C-B Slurry Wall and Bio-Polymar Relief Trench Phase III project was performed for the U.S. Army Corps of Engineers Sacramento District. The project consisted of constructing over 87,000 square feet of toe drain and 325,000 square feet of cutoff wall. The maximum depth of the cutoff wall was 65 feet with a maximum permeability of 5x10-7 cm/sec. Loose soils at the bottom of the trench required continuous work around the clock to maintain trench stability. The purpose of construction of the toe drain in conjunction with the cutoff wall was to protect the Sutter Bypass levee by diverting groundwater and preventing seepage into the foundation soils. The Bio-Polymar method which J.E. McAmis used to construct the relief trench allowed near vertical excavation of the 1-foot wide trench to a depth of over 17 feet.