After knowing the geological conditions and the geomechanical properties of the heterogeneous materials of the site, the main objective of this article is to present the procedure carried out to define the adjustment of dispersion values between the correlation of the rebound made in the field with the Schmidt hammer (sclerometer) and simple compression tested in the laboratory. These data will be of importance in the information generated to obtain a more reliable correlation with the tests carried out in the field, such as in the surveys carried out on the surface and in the excavations that make up said project.