Froehling & Robertson, Inc. provided supplemental geotechnical subsurface investigation services for this large-scale, $215 million design-build project. Our scope of work included subsurface
investigation, laboratory testing, and associated reporting for the Bonner Bridge replacement.
Given the numerous types of terrain that were crossed by the bridge, F&R was required to oversee the work of several specialty contractors who performed their work using track-mounting drill rigs (on dry ground), marsh buggy-mounted drill rigs (on grasslands), and barge drilling (in shallow and deep water). Most of these borings went to a depth of 150 to 175 feet.
At the completion of the field work and laboratory testing, a report was prepared that addressed the following items:
- Description of the regional geology;
- Descriptions of the field exploration and laboratory testing programs, including preparation of a site location plan, boring location plan, and a summary of laboratory testing results;
- Description of the subsurface conditions; and
- Descriptions of groundwater and surface water conditions encountered.