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Figure 3. Truck -mounted rig used to obtain cores on -site <br />2.2.3 Permeability testing <br />Field permeability tests using the NCAT Permeameter were investigated for the Cottage Grove, Inver <br />Grove Heights, and Blaine sections. An illustration of one test is shown in Figure 4. Depending on surface <br />roughness, obtaining a good seal was difficult, which complicated both the test and the usefulness of <br />results from the test. Future permeability tests for this project were ruled out, given that the field <br />permeability test has too many variables to confidently measure the permeability of an in -situ pavement <br />with uncertain design. <br />10 <br />