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
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.