Sixteen of these high volume chemicals are the subject of one of the regulatory procedures described above requiring additional data. The types of regulatory activity that cause the generation of data are: the registration standard program, the data call in program, the rebuttable presumption against registration program, and any special action employing the 3c2b provision of the Federal Insecticide, Fungicide, Rodenticide Act. However, due to differences in data requirements, each country would independently evaluate whether studies met their regulatory requirements, and determine the need for replacement studies. In the past six years, we have found the large majority of laboratories to be in compliance with current standards, and producing scientifically valid studies. We are also sending the registrants 3 c 2 B notifications which require a registrant to make a specific commitment within 90 days or the registration m. In some cases, EPA and a registrant may agree that a specific study does not need to be replaced. Thus, the data bases for the high volume chemicals to which people are most likely to be exposed are for the most part unaffected by the IBT situation, and where there is an impact, EPA has taken active regulatory steps to obtain replacement data. Data gap review was a search through a chemical's entire data base to determine which invalid studies needed to be replaced. Portions of the study are valid and can be used independently of the remainder of the study.
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