Contractor must provide this service as a non-destructive method to detect, identify and image (if specifically requested) subsurface elements either underground or within a surface (usually concrete). Ground Penetrating Radar must be used for utility locating and concrete scanning. Scanning must be completed before performing any work which could potentially disrupt, or damage elements buried in the ground or embedded within concrete, unless and sometimes even when reliable as-built documents are available. Ground Penetrating Radar contractor must determine the area where a void occurs and, usually, its size perpendicular to the plane of scanning. 90% accuracy is expected in identification and measurement. Ground Penetrating Radar contractor is not expected to determine the depth of the void (the parallel height of the void). Utility locates: Ground Penetrating Radar contractor must locate and mark all types of utilities (metal and plastic-encased) including but not limited to steam, electric, communications, gas and oil, sewer and storm, grounding rods, antennae, as well as any other voids found to a depth approximately ten feet, substrate dependent. Scanning concrete slabs: Ground Penetrating Radar contractor must locate and mark and perpendicularly dimension all void spaces including but not limited to rebar, conduit (metal and plastic), post-tensioned cables, other structural elements, as well as any other voids found, to a minimum thickness of 18 inches. Contractor must provide all equipment and tools to execute work and provide safety while doing so. Bidder must have all state, federal, and local licenses required for ground penetrating radar operations. Upon request, vendor must supply copies of licenses to UW-Madison.
