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conducts training as needed, and the IRIS staff conducts workshops and seminars both inside and outside the Agency on a regular basis. A joint symposium, sponsored by EPA and the Chemical Manufacturers Association, on IRIS and some of its underlying risk assessment methodologies is being considered as another opportunity to stress appropriate use of the system. Also, finalization and distribution of the PC version of IRIS will result in another round of intensive Agency-wide user training.

6. List Coordination - The Agency recently took a major step forward in coordinating and cross-referencing regulatory and regulation-like lists, by approving development of a pointer system that will contain references to all chemicals and other pollutants regulated by EPA and to all the lists on which each chemical or pollutant occurs. This system, tentatively called the Registry of Lists, is currently under development; a prototype should be built during this calendar year, and the system should be generally available in one to two years. It will be designed as a pointer system, telling users where other information is available, because each individual list has been compiled for different programmatic reasons, and there is generally not a uniform set of data elements across the lists. IRIS chemicals will be referred to explicitly in the Registry of Lists, and IRIS and the Registry will be compatible to ensure that IRIS users can get complete cross-reference information.

If you have further questions or comments regarding any of the responses included above, please contact Linda Tuxen, EPA IRIS Coordinator, at 202-382-5949 (FTS 382-5949).

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