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. The hazardous waste management commission is authorized to promulgate rules to implement this section, in accordance with section 319.137. By February 13, 2009, the hazardous waste management commission shall propose rules to implement the provisions of this section. To the extent there is a conflict between this section and section 644.143 or 644.026, this section shall prevail.
§ 319.109, RSMo