The report gives results of a study considering the possibility of using a spent oil shale itself as a water barrier or liner beneath a spent oil shale waste enbankment. Pertinent properties of unburned Tosco II spent shale and an average mixture of Lurgi spent shale have been measured. Materials consisting of 1, 20, and 30% burned spent Tosco shale admixed into unburned Tosco II shale have also been considered. Two autoclave mellowed materials admixed into their respective unmellowed spent shales have also been studied. The work indicates the difficulty of having both easy self healing and low permeability of the unmellowed Tosco materials and mixtures thereof, as well as perhaps the unmellowed Lurgi spent shale. Autoclave mellowing of the burned Tosco material, however, produced a high plasticity index material that may be blended with the silty unburned Tosco II spent shale to produce a liner having (at least in the short term) both low permeability and good self-healing possibilities.