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Appendix A <br /> Frequently Asked Questions <br /> About <br /> Tiered Approach to Corrective Action Objectives (TACO) <br /> Highway Authority Agreements <br /> And <br /> Ground Water Ordinances <br /> (Revised December 10, 2009) <br /> Background: The soil under many existing and former service stations is often <br /> contaminated with gasoline or the various chemical components of gasoline. The original <br /> source of the soil contamination may be from leaking underground storage tanks or from <br /> spills that may have occurred over time. Contamination may have spread into the soil <br /> under other properties including adjacent highways or streets. The Illinois Pollution <br /> Control Board has established rules for correcting or managing the soil contamination <br /> both on the service station site and on the adjacent public streets. These rules often result <br /> in Highway Authority Agreements and/or Ground Water Ordinances. <br /> 1. What is a TACO Agreement? <br /> A Tiered Approach to Corrective Action Objectives or"TACO" is a method used by the <br /> Illinois Environmental Protection Agency(IEPA) for developing remediation objectives <br /> for contaminated soil and groundwater resulting from leaking underground storage tanks. <br /> These remediation objectives generally take the form of Highway Authority Agreements <br /> or Ground Water Ordinances. They protect human health and take into account site <br /> conditions and land use. Remediation objectives generated by TACO agreements are <br /> risk-based and site-specific. <br /> 2. How can TACO help property owners? <br /> Previously, the IEPA used conservative "one-size-fits-all" remediation objectives at <br /> nearly every site. Baseline remediation objectives still exist, but other practical options <br /> also protective of human health have been added. TACO agreements provide flexibility <br /> to site owners and operators in developing site-specific'remediation objectives. It's now <br /> the site owners and operators who decide how best to manage their sites within TACO <br /> guidelines. However, this determination of site-specific remediation objectives is subject <br /> to IEPA approval and also the approval of the owners of any affected properties. <br /> Appendix A, Page 1 <br />