Tier 2

  Environmental Protection   >   Land Quality   >   Underground Storage Tanks   >   Leaking Underground Tanks   >   LUST Site Assessment   >   Tier 2
DNR events have been cancelled due to the Covid-19 outbreak. Safety of our users, attendees, partners and staff is most important. When possible, events will be rescheduled and that information will be distributed accordingly. Please check this site frequently for the latest closures, postponements and updates.
Tier 2 Assessment

The purpose of Tier 2 assessment is to collect additional site-specific data and, with the use of Tier 2 fate and transport modeling, determine what actual and potential receptors could be impacted by chemicals of concern.

A Tier 2 Site assessment must be conducted and a Site Cleanup Report submitted for all sites when any of the following conditions occur:

  • Free phase petroleum product is present at the site.
  • The site owner or tank owner/operator has decided to bypass the Tier 1 assessment and go directly to the Tier 2 assessment phase.
  • A pathway has failed the Tier 1 assessment.
  • During drilling, bedrock was encountered before groundwater.
  • Explosive vapor levels were measured during a Tier 1 assessment or recent investigation of the site.

Tier 2 Guidance along with application will help you to fill out the assessment report.The application will perform the same functions as the former software in essentially the same ways. The Tier 2 SMR Version 2.51 User’s Manual may also be helpful.

Web-Based Risk Based Corrective Action (RBCA) Application

Documents & Guidance

The web-based application will be used for new and revised Tier 2 Site Cleanup Reports, and Site Monitoring Reports.This does not apply to non-granular bedrock and granular bedrock sites. Please review the FAQ document posted on the DNR UST web page prior to using the application for RBCA purposes.

The Tier 2 Site Cleanup Report Guidance has been updated.  This update of the Tier 2 Guidance was undertaken in an effort to make the document more user-friendly and to better reflect current practice.  You will find most items unchanged; however, some of the updates include:

  • Tier 2 Guidance is now a searchable document in a user-friendly format with embedded links.
  • New guidance on surface water risk assessment.
  • The stabilization time for soil gas sampling (Option 2) has been changed to 24 hours.  This change will take effect 60 days after the new Tier 2 Guidance is posted to allow for projects already in progress.   This is effective September 6, 2015.
  • A section on diving plumes and free product has been added.

Tier 2 Guidance

Tier 2 Report Form - The pages for the Tier 2 Report which are not printed from the application are now fillable PDF forms.