The Stout portion of the Minker/Stout/Romaine Creek site is located on West Swaller Road near Imperial, Missouri, approximately 20 miles southwest of St. Louis. The Stout portion consists of five private properties, three of which have been purchased by EPA as part of a permanent relocation of area residents. In the late 1960s and early 1970s, southwest Missouri chemical plant producing 2,4.5-1 and hexachlorophene contracted a waste oil reclaimer to remove process residues. These residues, contaminated with 2,3,7,8-tetrachlordibenzo-p-dioxin (TCDD), were mixed with waste oils and sprayed as a dust suppressant on a nearby horse arena. In March of 1983, the horse arena owner had the contaminated soils removed to various portions of the Minker/Stout/Romaine Creek site. Approximately 700 cubic yards of the soil was used as fill in the Stout area, near two mobile home pads. In 1982, EPA sampling revealed high concentrations of TCDD in onsite soils. Later that year, three of the five properties making up the Stout portion were purchased by EPA and the residents were permanently relocated. No removal of contaminated soil has been performed to date. The primary contaminant of concern is dioxin.