Mo. Rev. Stat. § 319.109
The department shall establish requirements for the reporting of any releases and corrective action taken in response to a release from an underground storage tank, including the specific quantity of a regulated substance, which if released, requires reporting and corrective action. In so doing, the department shall use risk-based corrective standards which take into account the level of risk to public health and the environment associated with site-specific conditions and future land usage.
(L. 1989 H.B. 77, et al. § 5, A.L. 1995 H.B. 251)