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Building Materials, Gpr Data is a Leader in Non Destructive, Non Invasive, Cutting Edge, Geophysical Testing and Sub Surface Investigations. Non destructive, non invasive, geophysical testing and sub surface investigation services. Services include grave site mapping, archaeology, historic masonry building preservation, pavement structure analysis, non destructive testing and inspection, utility mapping, concrete rebar and post tension locating, bridge inspection, void detection, geological and geophysical archaeology ...