A new technology involving the use of forced hot air proved successful in remediating tetrachloroethene (PCE) at a site in the Piedmont of South Carolina.The dense nonaqueous phase liquid (DNAPL) was found at depths as much as 65 feet below the water table in fractured rock and saprolite soil. Extensive measures undertaken to evaluate the performance of this new technology showed forced hot air injection and enhanced vapor extraction to be very effective in removing high levels of contamination. The treatment zone targeted the mass of residual PCE contamination within the localized high-concentration DNAPL source area. Crosshole hot air and water flushing through fractures effectively recovered immobile DNAPL, especially with air preheated to >1000 degrees F above ambient temperatures. By increasing the temperature of the target zone from 60 degrees F to >250 degrees F, PCE vapor concentrations rose from <20 ppmv to >400 ppmv, which increased recovery rates dramatically. In less than 30 days, PCE concentrations in one of the primary wells fell 97%, from >4,000 ppb to <100 ppb. The thermal techniques created in situ steaming, which increased volatility and decreased subsurface absorption of residual and dissolved PCE. Temperatures of purge water from the primary well remained at 240 degrees F for several days and near 160 degrees F for several weeks following the test.