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temperature separates the VOCs from the soil as vaporized gases that can be efficiently recovered. If a soil temperature is selected that is optimal for activating microorganisms that break down the VOCs, then the technology can also be used to powerfully assist bioremediation methods. with a high sorptive capacity, can slow the mobility of radionuclides. In such cases, the travel time from contaminant release areas to where people may be exposed may be long in comparison to the radionuclide’s half-life (tritium, for example, has a half-life of 12.3 years, and strontium-90 has a half-life of 29 years). The geochemistry of the subsurface can also affect contaminant mobility. Under certain geochemical conditions, for example, contaminants dissolving from DNAPLs may biodegrade. Likewise, under some conditions, chromium may be present as relatively immobile trivalent chromium, Cr, whereas under other conditions, it may be

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