IBS, INC.

PART OF THE IBS FACILITY USES AN INCINERATOR TO CONDUCT A WIRE BURNING OPERATION. THIS OPERATION HAS INTRODUCED LOW LEVELS OF THE MOST TOXIC DIOXIN 2,3,7,8-TETRACHLORODIBENZO- P-DIOXIN (2,3,7,8-TCDD) INTO THE SOIL SURROUNDING THE INCIN- ERATOR AS WELL AS ISOMERS RELATED TO THE (2,3,7,8-TCDD) WHICH HAVE A TOXICITY EQUIVALENCE TO THE 2,3,7,8-TCDD. THE CASE IS NOTEWORTHY BECAUSE OF THE AGENCY'S USE OF THE TOX- ICITY EQUIVALENCE FACTOR POLICY FOR ESTIMATING THE HAZARDS OF DIOXINS OTHER THAN THE 2,3,7,8-TCDD TO SUPPORT AN EN- FORCEMENT ACTION. IMPACT ON APRIL 21, 1987, THE REGIONAL ADMINISTRATOR SIGNED A SECTION 106 ADMINISTRATIVE ORDER PROVIDING THAT IBS SECURE AN AREA WHERE DIOXIN AND DIOXIN RELATED ISOMERS HAD BEEN FOUND. THE ORDER ALSO REQUIRED IBS TO COVER ALL CONTAMINA- TED AREAS TO PREVENT TRANSMISSION TO OTHER AREAS.