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Figure 4. Configuration of the NCAT Permeameter in attempts at field permeability testing <br />2.2.4 Evaluation using ground penetrating radar <br />Field work in support of the project research included ground penetrating radar (GPR) testing of <br />pavement sections. GPR data was continuously collected at residential roadway speeds (20-40 miles per <br />hour) using equipment mounted with 400 MHz and 2 GHz antennas and a SIR-20 control and data <br />acquisition processor. The GPR configuration used for the study met or exceeded the ASTM D4748 and <br />ASTM D6087 standards. Multiple passes were conducted to ensure that sufficient data was collected at <br />13 locations across five municipalities. The truck -mounted antenna is shown in Figure 5. All GPR data <br />was coupled with precise GPS location data in support of more sophisticated analysis, which is <br />presented in Chapter 3. <br />11 <br />