40 CFR § 68.42 - Five-year accident history.
(a) The owner or operator shall include in the five-year accident history all accidental releases from covered processes that resulted in deaths, injuries, or significant property damage on site, or known offsite deaths, injuries, evacuations, sheltering in place, property damage, or environmental damage.
(b) Data required. For each accidental release included, the owner or operator shall report the following information:
(1) Date, time, and approximate duration of the release;
(2) Chemical(s) released;
(3) Estimated quantity released in pounds and, for mixtures containing regulated toxic substances, percentage concentration by weight of the released regulated toxic substance in the liquid mixture;
(4) Five- or six-digit NAICS code that most closely corresponds to the process;
(5) The type of release event and its source;
(6) Weather conditions, if known;
(7) On-site impacts;
(8) Known offsite impacts;
(9) Initiating event and contributing factors if known;
(10) Whether offsite responders were notified if known; and
(11) Operational or process changes that resulted from investigation of the release and that have been made by the time this information is submitted in accordance with § 68.168.
(c) Level of accuracy. Numerical estimates may be provided to two significant digits.