Pursuant to the risk management program regulations under 40 CFR §68.10(b), Program 1 eligibility requires that the process has not had an accidental release of a regulated substance that led to off-site death, injury, or response and restoration activities at an environmental receptor within five years prior to the risk management plan submission. Additionally, as part of the hazard assessment required under §68.42(a), sources are required to document all accidental releases from covered processes that resulted in deaths, injuries, or significant property damage on site, or known off-site deaths, injuries, evacuations, sheltering in place, property damage, or environmental damage. Why are there differences in the accident history elements required for determining Program 1 eligibility and the hazard assessment, and do Program 1 processes need to do five-year accident histories?