GeoView, Inc.

Mapping of Potential void features using ground penetrating radar case study

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Courtesy of GeoView, Inc.

Mayo Clinic - Jacksonville, Florida

GeoView conducted a ground penetrating radar (GPR) study in 2009 at the Mayo Clinic in Jacksonville, Florida. The GPR study was designed to locate anomalous features potentially associated with shallow voids between a recently installed terrazzo floor and the underlying concrete. The GPR data was collected with a GSSI SIR 3000 using a 2600 Megahertz antenna. The majority of the data was collected on a series of parallel transect lines spaced 3 inches apart. The data was collected with a time range of 5 nanoseconds and provided a maximum depth of penetration of 6-inches. The survey area was over 10,000 square feet. As part of the study over 1600 individual GPR data files were collected.

Data acquisition was at night to minimize impact to the clinic.The data was processed with GPR Slice to allow for 3-Dimensional viewing of the GPR data. The GPR method was effective in identifying numerous suspected voids within the survey area. Examples of the 2D and 3D GPR data collected at the project site are provided below. Subsequent coring activity by others confirmed the results of the GPR survey.

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