The main characteristics that determine the efficiency of the method are the gaseous permeability in the zone not saturated, flow tax d’ water, permeability of the water-bearing one, volatibilidade of the contaminante and its solubility. finally for the dissolved phase uses it biorremediao. The Biorremediao removes the remediation of an area impactada through natural techniques, using microorganisms (bacteria, fungos and leavenings) to degrade dangerous substances or composites to the human beings and to transform them into substances with little or no toxicidade. The microorganisms, in the same way that the human beings, eat and digest organic substances, of which they get nutrients and energy. The microorganisms digest organic substances gifts in the ground or the underground water, transforming them mainly into dioxide of carbon and water. They must be active and healthful to be able to play its task of remediation. For this, factors as temperatures, amount of nutrients and oxygen, must be in ideal conditions to make possible its development.

Distinct microorganisms distinct substances. Some of them survive extremely in adverse conditions, but others under the same conditions can die or grow very slowly, or still, generate more dangerous composites. So that the ideal conditions are reached, eventually the air addition, nutrients or other substances become necessary, beyond extra amounts of microorganisms.