One of the important problems associated with the utilization of eastern oil shale is the potential environmental impact of leaching raw and spent oil shale by rainfall or snow melts. In this study we have investigated the leaching behavior of up to 38 elements released from both raw an spent shale by contact with water and pH buffered solutions. The raw shale, spent shale and leachates are analyzed by instrumental neutron activation analysis. The samples analyzed to date include representatives for the Sunbury and Cleavland oil shale from Kentucky. Special attention has been directed to elements known to be toxic or involved in important physiological processes. Preliminary results confirm the expectation that trace elements exhibit markedly different release patterns from raw and spent shales. The elements Br, Cd, Mg, Ni, and Zn are removed form both raw and spent shale to the extent of 1-40% by leaching. The transference of trace elements to leachate is also found to be pH dependent. Effects of variables such as retorting temperature and ramping rate on the leaching properties of the spent shale are also presented.