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Updates for 311 MSDS reporting

How would a facility report a hazardous chemical that they acquired above the reporting threshold after the October 17, 1987 deadline, for Section 311?

An update must be submitted within three months anytime there is discovery of significant new information, or if an unreported hazardous chemical is present in a quantity exceeding the reporting thresholds. This update can be the MSDS for the new hazardous chemical, an updated list of hazardous chemicals, or an addendum to the original MSDS list submitted.