An official website of the United States government.

We've made some changes to If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Underground Storage Tanks (USTs)

Risk Based Decision Making and Underground Storage Tanks (USTs)

Risk-based decision-making (RBDM) is a process to make decisions about underground storage tank (UST) release sites based on the risk each poses to human health and the environment. EPA developed a comprehensive policy that explains the use of risk-based approaches at UST sites.

EPA works with its regional offices and with state and local UST programs to encourage the use of RBDM in their corrective action programs.

States are the primary implementers of the UST program.  Check with your state agency to see if they use RBDM and to find out the specifics of their program.

RBDM Policy

Directive 9610.17 (PDF) (20 pp, 6.2 MB, About PDF) – Use of Risk-Based Decision-Making Corrective Action Programs

RBDM Technical Support Documents

RBCA Fate and Transport Models: Compendium and Selection Guidance (PDF) (138 pp, 6.9 K, About PDF)