SUBSURFACE UTILITY MAPPING GPR grid surveying on a street in New York City GPR grid survey was conducted on a busy intersection in New York City. The survey successfully located and differentiated between a PVC natural gas main and an underlying cast iron water line. GPR can be a powerful tool for mapping the location and depth of metallic, non-metallic, plastic, concrete and asbestos-concrete utilities. Mapping with GPR to systematically co

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