Infiltration (double-rint) and pressure permeability (packer) tests were conducted in or near true in-situ oil shale retorts and at adjacent undisturbed locations to obtain comparative data to evaluate the potential for groundwater pollution due to increased fluid migration resulting from this retorting methodology. Tests were performed at the Geokinetics oil shale site located in Section 2, Township 14 South, Range 22 East, Uintah County, Utah. Test results suggest a slight increase in surface infiltration rates and hydraulic conductivity in or near the retort areas. It is expected that this type of true in-situ retorting will pose very little, if any, threat to groundwater resources in the area.