 In addition, injection of hot (dry) air can remove soil moisture and thus improve the gas permeability of the soil.Additional thermal technologies (such as electrical resistance heating, six-phase soil heating, radio-frequency heating, or thermal conduction heating) can be applied to the subsurface to heat the soil and volatilize/desorb contaminants, but these are generally viewed as separate technologies (versus a SVE enhancement) that may use vacuum extraction (or other methods) for collecting soil gas.On selection as a remedy, implementation of SVE involves the following elements