Ill. Admin. Code tit. 35 § 742.800

Current through Register Vol. 48, No. 49, December 6, 2024

Section 742.800 - Tier 2 Groundwater Evaluation Overview

If the contaminant concentrations in the groundwater exceed the applicable Tier 1 remediation objectives, a person has the following options:

a) Demonstrate that the groundwater ingestion exposure route is excluded from consideration pursuant to Subpart C;

b) Demonstrate that the groundwater contamination is at or below area background concentrations in accordance with Subpart D and, if necessary, an institutional control restricting usage of the groundwater is in place in accordance with Subpart J;

c) Remediate to Tier 1 remediation objectives;

d) Propose and obtain approval of Tier 2 groundwater remediation objectives in accordance with Section 742.805 and remediate to that level, if necessary;

e) Conduct a Tier 3 evaluation in accordance with Subpart I; or

f) Obtain approval from the Board to:

1) Reclassify the groundwater pursuant to 35 Ill. Adm. Code 620.260; or

2) Use an adjusted standard pursuant to Section 28.1 of the Act. [415 ILCS 5/28.1] .

Ill. Admin. Code tit. 35, § 742.800