Retorted oil shale samples were moistened with five different treated process waters and then leached following the American Society for Testing and Materials method D3987. Concentrations of total inorganic carbon, arsenic, boron, barium, cadmium, chromium, molybdenum, lead, antimony, selenium, strontium and vanadium were measured by inductively coupled argon plasma emission spectroscopy in both the process waters and the leachates from the moistened oil shale samples. Moistening the retorted oil shale with the treated process waters did not result in elemental adsorption by the oil shale and may have generally decreased the quality of the leachates. Long-term equilibrium studies are recommended for further evaluation of codisposal with treated process waters. 6 refs., 3 tabs.