Section 742.115  Key Elements

To develop remediation objectives under this Part, the following key elements shall be addressed.

a)         Exposure Routes

1)         This Part identifies the following as potential exposure routes to be addressed:

A)        Outdoor inhalation;

B)        Indoor inhalation;

C)        Soil ingestion;

D)        Groundwater ingestion; and

E)        Dermal contact with soil.

2)         The evaluation of exposure routes under subsections (a)(1)(A), (a)(1)(B), (a)(1)(C) and (a)(1)(D) is required for all sites when developing remediation objectives or excluding exposure pathways.  Evaluation of the dermal contact exposure route is required for use of RBCA equations in Appendix C, Table C or use of formal risk assessment under Section 742.915.

3)         The groundwater ingestion exposure route is comprised of two components:

A)        Migration from soil to groundwater (soil component); and

B)        Direct ingestion of groundwater (groundwater component).

4)         The outdoor inhalation route is comprised of two components:

A)        Migration from soil through soil gas to outdoor air (soil component); and

B)        Migration from soil gas to outdoor air (soil gas component).

5)         The indoor inhalation exposure route is comprised of two components:

A)        Migration from soil gas to indoor air (soil gas component); and

B)        Migration from groundwater through soil gas to indoor air (groundwater component).

b)         Contaminants of Concern

            The contaminants of concern to be remediated depend on the following:

1)         The materials and wastes managed at the site;

2)         The extent of the no further remediation determination being requested from the Agency pursuant to a specific program; and

3)         The requirements applicable to the specific program, as listed at Section 742.105(b) under which the remediation is being performed.

c)         Land Use

            The present and post-remediation uses of the site where exposures may occur shall be evaluated.  The land use of a site, or portion thereof, shall be classified as one of the following:

1)         Residential property;

2)         Conservation property;

3)         Agricultural property; or

4)         Industrial/commercial property.

d)         Environmental Media of Concern

This Part provides procedures for developing remediation objectives for the following environmental media:

1)         Soil;

2)         Soil gas;

3)         Groundwater.

(Source:  Amended at 37 Ill. Reg. 7506, effective July 15, 2013)