35 Ill. Adm. Code 742.935
Indoor Inhalation Exposure Route
Section 742.935 Indoor Inhalation Exposure Route
a) Exclusion of Exposure Route
Site information may
demonstrate that there is no actual or potential impact of contaminants of
concern to receptors from the indoor inhalation exposure route. In these
instances, a demonstration excluding the exposure route shall be submitted to
the Agency for review and approval. A submittal under this Section shall
include the following information:
1) A
description of the site, physical site characteristics, existing and planned
buildings, and existing and planned man-made pathways; and
2) A
discussion of the possibility of the route becoming active in the future.
b) Exclusion of Exposure Route Using Building Control Technologies
Any proposals to use building
control technologies as a means to prevent or mitigate human exposures under
the indoor inhalation exposure route that differ from the requirements of
Subpart L shall be submitted to the Agency for review and approval. A
submittal under this Section shall include the following information:
1) A
description of the site and physical site characteristics;
2) The
current extent and modeled migration of contamination;
3) Geology,
including soil types and parameters;
4) Results
and locations of sampling events;
5) Scaled
map of the area, including all buildings and man-made pathways;
6) A
description of building characteristics and methods of construction, including
a description of man-made pathways;
7) Present
and post-remediation uses of the land that are at issue due to the area of
contamination, including human receptors at risk;
8) A
description of any building control technologies currently in place or
proposed for installation that can reduce or eliminate the potential for
completion of the exposure route, including design and construction
specifications;
9) Information
regarding the effectiveness of any building control technologies currently in
place or proposed for installation and a schedule for performance testing to
show the effectiveness of the control technology. For buildings not yet
constructed, an approved building control technology shall be in place and
operational prior to human occupancy;
10) Identification
of documents reviewed and the criteria used in the documents for determining
whether building control technologies are effective and how those criteria compare
to existing or potential buildings or man-made pathways at the site; and
11) A
description as to how the effectiveness of the building control technologies
will be operated and maintained for the life of the buildings and man-made
pathways, or until soil gas and groundwater contaminant concentrations have
reached remediation objectives that are approved by the Agency. This includes
provisions for potential extended system inoperability due to power failure or
other disruption.
c) Calculations and Modeling
Used to Establish Soil Gas Remediation Objectives
The calculations and
modeling shall account for contaminant transport through the mechanisms of
diffusion and advection. Proposals to use soil gas data, including sub-slab
samples, to establish remediation objectives for the indoor inhalation exposure
route that differ from the requirements of Section 742.227 shall be submitted
to the Agency for review and approval. A submittal under this Section shall
include the following information:
1) Scaled
map of the area, showing all buildings and man-made pathways (current and
planned);
2) The
current extent and modeled migration of contamination;
3) Geology,
including soil types and parameters;
4) Depth
to groundwater (including seasonal variation) and flow direction;
5) Location
of soil gas sampling points;
6) A
discussion of soil gas sampling procedures that, at a minimum, addresses the
following:
A) sampling
equipment;
B) soil
gas collection protocol, including field tests and weather conditions; and
C) laboratory
analytical methods.
d) Calculations and
Modeling Used to Establish Soil Remediation Objectives
The calculations and
modeling shall account for contaminant transport through the mechanisms of
diffusion and advection. Any proposals to use soil data in lieu of soil gas
data to establish remediation objectives for the indoor inhalation exposure
route shall be submitted to the Agency for review and approval. A submittal
under this Section shall include the following information:
1) Scaled
map of the area, showing all buildings and man-made pathways (current and
planned);
2) The
current extent and modeled migration of contamination;
3) Geology,
including soil types and parameters;
4) Location
of soil sampling points;
5) A
discussion of soil sampling procedures that, at a minimum, addresses the
following:
A) sampling
equipment;
B) soil
collection protocol, including field tests and weather conditions; and
C) laboratory
analytical methods;
6) Mathematical
and technical justification for the model proposed; and
7) Demonstration
that the model was correctly applied.
e) Calculations
and Modeling Used to Establish Groundwater Remediation Objectives
The calculations and modeling
shall account for contaminant transport through the mechanisms of diffusion and
advection. Proposals to use groundwater data to establish remediation
objectives for the indoor inhalation exposure route that differ from the
requirements of Sections 742.805 and 742.812 shall be submitted to the Agency
for review and approval. A submittal under this Section shall include the
following information:
1) Scaled
map of the area, showing all buildings and man-made pathways (current and
planned);
2) The current extent and
modeled migration of contamination;
3) Geology,
including soil types and parameters and the thickness of the capillary fringe;
4) Depth to groundwater
(including seasonal variation) and flow direction;
5) Results and locations
of groundwater sampling events;
6) Mathematical and
technical justification for the model proposed; and
7) Demonstration that the
model was correctly applied.