EPA publishes new default values/assumptions used in TSCA new chemical risk assessments (New Chemicals Division reference library)

EPA released technical resources describing common/default values used in TSCA new chemical risk assessments (e.g., occupational exposure and environmental release assumptions). While not a binding rule, the defaults are operationally important for PMN/SNUN submitters because they can affect EPA’s exposure estimates and risk determinations and therefore the quality and predictability of submissions and any resulting risk management measures.