Abstract: This invention comprises a small, mobile, energy-efficient, batch-type soil roaster which can be utilized directly at a contamination site. Hydrocarbon contaminated dirt or soil is placed into a rotating drum. The soil is fired or roasted utilizing a burner until all hydrocarbons are completely evaporated out of the soil. The hydrocarbon gases that are vaporized from the soil go through a water scrubber filter and an afterburner system where the hydrocarbon component of the vapors or gases are burned off and destroyed at high temperatures. A vortex effect is created within the integral afterburner/stack unit, causing the hydrocarbon gases to remain in the stack longer, thereby ensuring a more complete burning of the hydrocarbons.