Project Summary A 21,000 square foot laboratory and research addition to the existing facility was planned for Frisby Aerospace’s Clemmons, North Carolina location. Problem The geotechnical investigation indicated 3 to 5.5 feet of medium stiff to stiff lean clay and elastic fill underlain by soft to very stiff elastic silt with sand. Shallow foundations constructed on the variable soil conditions would experience excessive total and dif- ferentia

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