By MICHAEL KUNZELMAN | The Associated Press
An engineering expert has testified he believes excavation work performed by an Army Corps of Engineers contractor caused New Orleans' floodwalls to breach in two places during Hurricane Katrina.
Robert Bea, a retired University of California engineering professor, explained his position Monday during a trial of homeowners' claims against the corps and contractor Washington Group International Inc.
Bea is an expert witness for the plaintiffs.
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