When working to get a No Further Remediation (NFR) letter through the Illinois EPA’s Leaking Underground Storage Tank (LUST) program, an investigation of three pathways of concern must be conducted: soil, groundwater, and vapor. IEPA has required soil and groundwater evaluations for over 20 years, but they only recently started requiring vapor intrusion assessments.
Because vapor assessments are not required for all LUST Incidents, IEPA has published a flowchart to help determine when soil gas sampling is necessary:
Gabriel’s Project Managers work with the Illinois EPA’s LUST division to determine the appropriate sampling for each specific site, including if this indoor inhalation exposure route must be investigated.
The Site Remediation Program (SRP) also requires the investigation of vapor in certain circumstances, but because the contaminants of concern vary greatly within the SRP program, they don’t have a similar flowchart established. Each site is addressed on a case-by-case basis.
If you have any questions about vapor assessments or a specific site, contact John Polich at 773-486-2123 or jpolich[at]gabenv.com.