The Missouri Department of Natural Resources (MDNR) and Petroleum Storage Tank Insurance Fund (PSTIF) have both previously drafted separate sets of proposed rules regarding Risk Based Corrective Action (RBCA) for underground storage tank (UST) sites. These two agencies have disagreed on what the RBCA rules should contain based on stakeholder input.

The MDNR and PSTIF agree on many aspects of the RBCA process, however, there are key issues yet to be agreed upon. For instance, the MDNR requires delineation of impact to Default Target Levels (DTLs) or residential risk based target levels. Alternatively, the PSTIF proposes delineation criteria based on land use (residential vs. non-residential) and groundwater use (if used for domestic purposes or not). The agencies also differ on the requirement for Long Term Stewardship (LTS) measures such as the Reasonably Anticipated Future Use (RAFU) of a site, and Activity and Use Limitations (AULs).