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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.

The Herbert Hoover Dike Project was the first phase of a series of pilot projects for the U.S. Army Corps of Engineers, undertaken to stabilize the dike surrounding Lake Okeechobee.  The project consists of installation of approximately 870,000 square feet of cutoff wall to depth of 36 feet, along with installation of 24,000 linear feet of bio-polymar relief trench and associated features.  The Hoover Dike which surrounds Lake Okeechobee - the second largest fresh water lake in the continental United States-  presents many unique challenges stemming from existing levee conditions caused in part by engineering methods which were utilized during the dikes original construction in the early 1900s.