LUST Site Assessment

The documents linked to this page all relate to the assessment of sites where leaking underground storage tanks (LUST) are or have been located. The process of assessment uses risk-based corrective action (RBCA). The objective of RBCA is to evaluate the risks posed by contamination to human health, safety and the environment using a progressively more site-specific, three-tiered approach. All proposed corrective actions must be submitted and supervised by a certified groundwater professional.

If necessary, you can receive copies of these documents by contacting Bonnie Garrison at 515-725-8310 or

UST / LUST Resources

Software Programs:

Tier 1 RBCA

Tier 2 Version 2.51 RBCA Software & Tier 2 Version 3.00 RBCA Software is the latest update of Tier 2 / SMR software.  For new leaking underground storage tank sites undergoing the Iowa risk based corrective action process that results in a Tier 2 Site Cleanup Report to be completed, the Tier 2 Software Version 3.00 should be used.  This does not apply to non-granular bedrock and granular bedrock sites. This is effective May 22, 2010.

Tier 2 Bedrock Version 1.20

RBCA Tier-3 Analysis

BR Slug Software

For updates and guidance, see also Tank Memos and the Groundwater Professional Bulletin Board.