A spill of approximately 50,000 gallons of pure xylene occurred as a result of a train derailment in north central Georgia in 1988. The spill resulted in two seperate xylene plumes in the groundwater. Heterogeneous layers of interbedded sands, silts and silty clays undertie the site. Most of the site can be characterized as having low permeability. Depth to bedrock at the site is generally at 7 to 15 feet.