THE THOMPSON CHEMICALS SITE IS LOCATED IN AN INDUSTRIAL AREA ALONG THE MISSISSIPPI RIVER IN ST. LOUIS, MISSOURI. A NUMBER OF DIFFERENT INDUSTRIAL FACILITIES HAVE OPERATED AT THE SITE SINCE THE LATE 1800'S. THESE OPERATIONS HAVE INCLUDED A COAL TAR PROCESSING FACILITY, A STORAGE AND MANUFACTURING FACILITY FOR WOOD TREATING PRODUCTS, THE PRODUCTION OF 2,4,5,T AND 2,4-D ACID PESTICIDES AND THE MANUFACTURE OF AGENT ORANGE. THE SITE IS CURRENTLY IN USE AS A BULK TERMINAL FACILITY FOR SOLVENT PRODUCTS.