THE DOVER CHEMICAL SITE IS LOCATED IN TUSCAWARS COUNTY, IN EAST CENTRAL OHIO. DOVER CHEMICAL CORPORATION, JUST OFF OF INTERSTATE 77, OWNS FOUR PARCELS OF LAND NEAR THE CITY OF DOVER CITY LIMITS THAT TOTAL APPROXIMATELY 60 ACRES. SINCE 1950, DOVER CHEMICAL HAS OPERATED A MANUFACTURING FACILITY IN DOVER, OHIO. THE FACILITY PRODUCES PHENYL PHOSPHITES AND CHLORINATED PARAFFIN PRODUCTS THAT ARE USED IN THE MANUFACTURE OF PRESSURE LUBRICANTS, PLASTICIZERS, AND FLAME RETARDANTS FOR VINYL PRODUCTS. SITE ACTIVITIES FROM THE 1950S TO THE EARLY 1970S INTRODUCED SITE-RELATED CONSTITUENTS INTO THE ENVIRONMENT IN THE VICINITY OF THE DOVER CHEMICAL PLANT. BASED ON THE RI/FS INVESTIGATION RESULTS IN 1991, THE U.S. EPA REQUESTED THAT DOVER CHEMICAL TAKE INTERIM ACTIONS TO REDUCE THE MOBILITY AND POTENTIAL FOR CONTACT WITH SOILS CONTAINING POLYCHLORINATED DIBENZODIOXINS(PCDDS) AND DIBEN- ZOFURANS (PCDFS). DOVER AND U.S. EPA ENTERED INTO AN ADMINISTRATIVE ORDER ON CONSENT (AOC) TO CONDUCT THIS WORK. THIS ACTION WAS TAKEN TO MITIGATE A DIRECT CONTACT RISK TO WORKERS IN THE ON-SITE SOILS AT THE SITE AND DID NOT ADDRESS POTENTIAL RISK ASSOCIATED WITH OTHER ORGANIC CONSTITUENTS AT THE SITE. ON MAY 10, 1993, U.S. EPA PROPOSED THE DOVER CHEMICAL CORPORATION SITE FOR INCLUSION ON THE NPL BUT HAS NEVER BEEN FINALIZED ON THE NPL.