Coal tars and pentachlorophenol solutions have contaminated a large number of industrial sites in the United States. Coal tars have been produced at over 1500 manufactured gas plants (MGP) (Anastos et al. 1984; Unites and Housman 1982; Krumrine 1983; Pereira et al. 1983; U.S. EPA 1985) and at numerous coking plants for the steel industry (Coates et al. 1982). Creosote derived from coal tar and pentachlorophenol mixed with diesel oil have becm used as preservatives at over 1000 wood-treating plants (Hickok et al. 1982; NUS Corporation 1985). In many cases, these dense organic liquids have leaked from wasteretaining facilities or have been injected into disposal wells.