The Bayou Bonfouca site is an abandoned creosote works facility that was operational from 1892 to 1970. It is located north of Lake Pontchartrain in Slidell, Louisiana in a 100-year flood plain, and is characterized by standing water and saturated surface soil. The creosote plant treated pilings for use in railway construction. Over the years, the plant operated under the ownership of various creosote companies. Present property ownership is with the Braseman Corporation. Numerous creosote releases occurred during the years of operation. Since 1976, numerous studies were done to examine the extent of the problems orginating from the Bayou site and in December 1982, the site was placed on the NPL. The primary contaminants of concern are polynuclear aromatic hydrocarbons (PAHs) including: benzo(a) pyrene, benzo(a)anthracene, benzo(b)flouranthene, benzo(k)fluoranthene, indeno(1,2,3,-cd) yrene, and chrysene. In August 1985, excavation and offsite landfilling on creosote waste piles was addressed in a source control operable unit ROD. The determination of the extent of soil contamination was the focus of this second operable unit.