The biggest challenge in investigating a contaminated area is accurate diagnosis. High Resolution Site Characterization (HRSC) of contaminated areas maps the subsurface every each 1.5 cm and it is being increasingly used and accepted in the field of soil contamination, for instance studies of environmental impact investigations. Soils with greater capacity to retain ions, such as clay and organic matrices, have higher electrical conductivity, mainly due to the presence of ions. When contaminated by landfill leachate, the studied soils undergo through several changes in concentration, resulting from the massive presence of larger ions as Ca²⁺, Mg²⁺ , Na⁺ , K⁺ , NH^{4 +} , NO₃ ^- , PO₄ ^2- , Cl^- , SO₄ ^2- and HCO₃ ^- , characteristics of percolates from this source.