Tier 1 Assessment

The purpose of the Tier 1 assessment is to use limited site data and conservative assumptions to determine whether a site poses an unreasonable risk to public health, safety or the environment. The first form below is known as the Tier 1 report. The Tier 1 Report is followed by a guidance document. This guidance in combination with the Tier 1 software* is used to help with completion of a Tier 1 evaluation and to fill out the Tier 1 report form.

Software for Tier 1 can be downloaded or by contacting Bonnie Garrison at (515)281-6010 or bonnie.garrison@dnr.iowa.gov.

The following documents are in pdf format and require the Adobe Acrobat Reader to be viewed.  Click on the icon at the bottom of the page to download Acrobat Reader.

• Tier 1 Report form (.pdf 77kb)
• Tier 1 Guidance (.pdf 135kb)
       Institutional Control Section (Revised 8/2005) (.doc 75kb)
• Appendix A--Lust staff by region (.pdf 367kb)
• Appendix B--Bedrock less than 50 feet deep (.pdf 29kb)
• Appendix C--Tier 1 flow charts (.pdf 55kb)
• Appendix D--Pathway evaluation worksheet (.pdf 25kb)
• Appendix E--Environmental Covenants (Revised 1/2008)
• Appendix F--Using data acquired prior to August 15, 1996 (.pdf 26kb)
• Appendix G--Selected passages from Chapter 161 Water Quality Standards (.pdf 11kb) 
• Figure 1--Suggested Monitoring Well Diagram (.pdf 89KB) 
• Figure 2--Hydraulic Conductivity Well Geometry Parameters - Partially Penetrating Well (.pdf 23kb) 

The documents below are available in both pdf and Microsoft Word 97 format:

• 542-1532 Sanitary Sewer Notification (.pdf 76kb | .doc 26kb)
• 542-1530 Water Supply Notification   (.pdf 69kb | .doc 27kb)
• 542-1531 Water Utility Company Notification for Plastic Pipe (.pdf 70kb | .doc 27kb)