In the present paper there are presented comparative studies of laboratory for soil sampling in the area of an abandoned well. The contaminated soil samples have been subjected to thermal methods (combustion and desorption) and successive extraction with solvents. For the three methods for decontamination it has been determined the decontamination degree. The comparison of the obtained results could be achieved only by means of analysis of the type of soil polluted. Thus, there have been compared the obtained results and have been determined the advantages and disadvantages of applied methods.