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Herbert Hoover Dike Restoration Quality Control Services
Client: Bauer Foundation Corporation
Location: Canal Point, Florida
Williams Geotechnical Group, a business unit of
Gannett Fleming, provided quality control and drilling
services for the installation of a soil-cement wall in
the center of the 142-mile Lake Okeechobee dike.
The installed wall is approximately 30-inches wide
and varied from 55 to 70-feet deep. All services were
performed in compliance with the U.S. Army Corps of
Engineers (USACE) requirements and specifications.
Our firm was contracted to provide a full range of quality control services, including cutoff wall logging, field sampling, and laboratory testing of the excavated soils and soil-cement mix. Additionally, verification borings were performed and logged by a borehole logger for acceptance of the wall. Our firm also prepared the drilling plan and sampling and analysis plan for the project.
The USACE validated our firm’s Pompano and Belle Glade, Florida, laboratories. Grain-size, permeability, and unconfined-compression tests are performed in these laboratories. The test results were posted for our client and the USACE to review, using our firm’s proprietary, web-based information management system. Per month, approximately 700 samples are processed through the laboratory.
The acceptance tests for the installed wall required our firm to perform the drilling of a continuous-cored hole, from the top of the wall to within two feet of the bottom of the wall elevation, and spaced at 200-foot intervals along the installed wall. Required minimum recovery is 95 percent, and our firm met this standard on all borings. Additionally, our firm performed field permeability in the boring on the twenty-eighth day following wall placement and inclinometer readings for verticality of the wall. A 360-degree, flat-projection video camera was used inside the cored hole for verification of wall continuity. Representative samples from the five-foot core runs were selected for laboratory unconfined testing, and a USACE gINT log was provided.
Our firm excelled on this Task Order, which is valued at approximately $23 million, and met all USACE and client expectations.