NATURE OF THE CASE: FROM 11/69 TO 12/71, NEPACCO, INC MANFCTRD HEXACHLORO- PHENE AT SYNTEX, VERONA, MO PLANT. PROD OF HEXACHLOROPHENE REQ PROD OF INTERMEDIATE, TRICHLORO- PHENOL. DURING PROD OF TRICHLOROPHENOL, TETRACHLOROBENZENE IS CONVERTED TO TCP AND DIOXIN IS UNAVOIDABLY PROD. NEPACCO TRANSFERRED STILL BOTTOMS CONTAINING DIOXIN VIA ENCLOSED PIPE SYSTEM TO INSUL TANK USED FOR STORAGE AT BACK OF VERONA PLT. IN 2/71, NEPACCO CONTRACTED W/INDEPENDENT PETROCHEMICAL CORP (IPC) FOR REMOVAL OF ACCUM WASTE. IPC SUBCONTRACTED W/RUSSEL BLISS FOR STILL BOTTOM REMOVAL. BLISS WAS IN WASTE OIL BUS. FROM 2/71 TO 10/71, BLISS PERIODICALLY COLLECTED NEPACCO'S WASTE FROM INSUL TANK AND MIXED W/WASTE OIL AT TANK FAC ON GERMAN BLVD IN FRONTENAC, MO. AS PRT OF WSTE OIL BUS, BLISS SPRAYED WSTE OIL ON VARIOUS GROUNDS FOR DUST CNTRL. ON 1/20/84, EPA FILED SUIT UNDER SEC 7003/RCRA AND SEC 104, 106, 107/CRCLA FOR INJUNC RELIEF AND COST RECOVERY FOR DIOXIN CONTAMINATION AT SIX SITES: SHENANDOAH STABLES, SADDLE AND SPUR CLUB, TIMBERLINE ARENAS, BUBBLING SPRINGS RANCH, BLISS TANK SITE, AND A RESIDENTIAL AREA NEAR ROSATI, MO. THESE SITES WERE CONTAMINATED DUE TO OILING BY BLISS IN 1971. 01/14/88 07-87-017 CASE SUMMARY: DIOXIN CONTAMINATED WASTE OIL WAS SPRAYED ON THIS SITE IN THE EARLY 1970'S. THE DIOXIN ORIGIN