35 Ill. Adm. Code 742.115
Key Elements
Section 742
Section 742.115Â Key Elements
To develop remediation
objectives under this Part, the following key elements shall be addressed.
a)Â Â Â Â Â Â Â Â Exposure Routes
1)Â Â Â Â Â Â Â Â This Part identifies the following as potential exposure
routes to be addressed:
A)Â Â Â Â Â Â Â Outdoor inhalation;
B)Â Â Â Â Â Â Â Indoor inhalation;
C)Â Â Â Â Â Â Â Soil ingestion;
D)Â Â Â Â Â Â Â Groundwater ingestion; and
E)Â Â Â Â Â Â Â Dermal contact with soil.
2)Â Â Â Â Â Â Â Â 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)Â Â Â Â Â Â Â Â The groundwater ingestion exposure route is comprised of two
components:
A)Â Â Â Â Â Â Â Migration from soil to groundwater (soil component); and
B)Â Â Â Â Â Â Â Direct ingestion of groundwater (groundwater component).
4)Â Â Â Â Â Â Â Â The outdoor inhalation
route is comprised of two components:
A)Â Â Â Â Â Â Â Migration
from soil through soil gas to outdoor air (soil component); and
B)Â Â Â Â Â Â Â Migration from soil gas
to outdoor air (soil gas component).
5)Â Â Â Â Â Â Â Â The indoor inhalation
exposure route is comprised of two components:
A)Â Â Â Â Â Â Â Migration
from soil gas to indoor air (soil gas component); and
B)Â Â Â Â Â Â Â Migration
from groundwater through soil gas to indoor air (groundwater component).
b)Â Â Â Â Â Â Â Â Contaminants of Concern
The contaminants of concern to be remediated depend on the
following:
1)Â Â Â Â Â Â Â Â The materials and wastes managed at the site;
2)Â Â Â Â Â Â Â Â The extent of the no further remediation determination being
requested from the Agency pursuant to a specific program; and
3)Â Â Â Â Â Â Â Â The requirements applicable to the specific program, as listed
at Section 742.105(b) under which the remediation is being performed.
c)Â Â Â Â Â Â Â Â 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)Â Â Â Â Â Â Â Â Residential property;
2)Â Â Â Â Â Â Â Â Conservation property;
3)Â Â Â Â Â Â Â Â Agricultural property; or
4)Â Â Â Â Â Â Â Â Industrial/commercial property.
d)Â Â Â Â Â Â Â Â Environmental Media of
Concern
This Part provides procedures for
developing remediation objectives for the following environmental media:
1)Â Â Â Â Â Â Â Â Soil;
2)Â Â Â Â Â Â Â Â Soil gas;
3)Â Â Â Â Â Â Â Â Groundwater.