Chemicals not in TACO Tier I Tables
The Excel spreadsheet presented below
includes objectives
for chemicals not contained in the TACO Tier I tables.
These objectives are for convenience only and are not
TACO Tier I objectives. Section 742.510 c) of the TACO
regulations allow a person to request site-specific
remediation objectives from the Agency for chemicals not
included in the TACO Tables. Approval to use these objectives
must still be obtained from Illinois EPA on a site specific and program
basis.
The development of these objectives is based upon the USEPA's toxicity
value hierarchy as specified in OSWER Directive 9285.7-53. USEPA's integrated
Risk Information System (IRIS) is the first tier of this hierarchy.
Calculation of the soil remediation objectives was accomplished through
use of the risk-based soil screening level (SSL) equations from Section
742.Appendix C, Table A of TACO. Default exposure durations and
contact rates from Section 742.Appendix C, Table B of TACO were used in
these calculations. Groundwater objectives were established
following methodologies presented in the Groundwater Quality
Standards, 35 IAC 620. Subpart F.
Non-TACO Objectives
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