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Tiered Approach to Corrective Action Objectives

Tiered Approach to Corrective Action Objectives (TACO)

Fact Sheets

  1. Introduction
  2. Risk
  3. No Further Remediation Letters
  4. Institutional Controls
  5. Engineered Barriers
  6. Tier 1
  7. Tier 2
  8. Pathway Exclusion
  9. Background Determination
  10. Compliance with Remediation Objectives
  11. Metals
  12. Off-site Contamination
  13. Mixture Rule
Get Acrobat Reader (712 bytes)This information is also available in an Adobe Acrobat PDF document (217KB, 28 pages). You will need the free Acrobat Reader software, available from Adobe's web site, to view it.
TACO is the Illinois EPA's method for developing remediation objectives for contaminated soil and groundwater. These remediation objectives protect human health and take into account site conditions and land use. Remediation objectives generated by TACO are risk-based and site-specific.

Previously, the Illinois EPA's Bureau of Land (BOL) used conservative "one-size-fits-all" remediation objectives at nearly every site. Baseline remediation objectives still exist, but other options also protective of human health have been added.

TACO provides flexibility to site owners and operators in developing site-specific remediation objectives. It's now the site owners and operators who decide how best to manage their sites within TACO guidelines. However, this determination of site-specific remediation objectives is subject to Illinois EPA review and approval.

By exercising these new choices, site owners and operators may reduce remediation costs, return more sites to productive use, hasten property redevelopment, and still fully comply with environmental laws and regulations.

Important Note: Some of these fact sheets include mathematical formulas. Due to the limitations of web page display technologies, these formulas might not be displayed properly on your system. The formulas should display properly in the Adobe Acrobat PDF version of these fact sheets.

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