[en] A method for decontaminating a hydrocarbon spill in situ using electrical heating and fluid injection is described. Extensive testing of this system demonstrated that this integrated approach can remove hydrocarbon contaminants in situ at an accelerated rate. A mathematical model that combines all principal heat transfer elements - electrical heating, convection, conduction and accumulation of energy - and solves the heat transfer problem for the integrated process, is demonstrated. An alternative use for the model is to investigate the practicality of the process in terms of energy requirements and the time required to clean the soil. The model was compared to a commercial simulator and was found be in good agreement. 13 refs., 11 figs