Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 734 - PETROLEUM UNDERGROUND STORAGE TANKS
Subpart C - SITE INVESTIGATION AND CORRECTIVE ACTION
Section 734.325 - Stage 3 Site Investigation
Universal Citation: 35 IL Admin Code ยง 734.325
Current through Register Vol. 48, No. 38, September 20, 2024
The Stage 3 site investigation must be designed to identify the extent of off-site soil and groundwater contamination that, as a result of the release, exceeds the most stringent Tier 1 remediation objectives of 35 Ill. Adm. Code 742 for the applicable indicator contaminants.
a) The Stage 3 site investigation must consist of the following:
1) The drilling of
soil borings and collection of soil samples necessary to identify the extent of
soil contamination beyond the site's property boundaries that exceeds the most
stringent Tier 1 remediation objectives of 35 Ill. Adm. Code 742 for the
applicable indicator contaminants. Soil samples must be collected in
appropriate locations and at appropriate depths, based upon the results of the
soil sampling and other investigation activities conducted to date, provided,
however, that soil samples must not be collected below the groundwater table.
All samples must be analyzed for the applicable indicator contaminants;
and
2) The installation of
groundwater monitoring wells and collection of groundwater samples necessary to
identify the extent of groundwater contamination beyond the site's property
boundaries that exceeds the most stringent Tier 1 remediation objectives of 35
Ill. Adm. Code 742 for the applicable indicator contaminants. If soil samples
are collected from a monitoring well boring, the samples must be collected in
appropriate locations and at appropriate depths, based upon the results of the
soil sampling and other investigation activities conducted to date, provided,
however, that soil samples must not be collected below the groundwater table.
All samples must be analyzed for the applicable indicator
contaminants.
b) The Stage 3 site investigation plan must include, but is not limited to, the following:
1) An executive summary of Stage 2
site investigation activities and actions proposed in the Stage 3 site
investigation plan to identify the extent of soil and groundwater contamination
beyond the site's property boundaries that exceeds the most stringent Tier 1
remediation objectives of 35 Ill. Adm. Code 742 for the applicable indicator
contaminants;
2) The results of the
Stage 2 site investigation, including but not limited to the following:
A) One or more site maps meeting the
requirements of Section
734.440
that show the locations of all borings and groundwater monitoring wells
completed as part of the Stage 2 site investigation;
B) One or more site maps meeting the
requirements of Section
734.440
that show the locations of all groundwater monitoring wells completed to date,
and the groundwater flow direction;
C) One or more site maps meeting the
requirements of Section
734.440
that show the extent of soil and groundwater contamination at the site that
exceeds the most stringent Tier 1 remediation objectives of 35 Ill. Adm. Code
742 for the applicable indicator contaminants;
D) One or more cross-sections of the site
that show the geology of the site and the horizontal and vertical extent of
soil and groundwater contamination at the site that exceeds the most stringent
Tier 1 remediation objectives of 35 Ill. Adm. Code 742 for the applicable
indicator contaminants;
E)
Analytical results, chain of custody forms, and laboratory certifications for
all samples analyzed for the applicable indicator contaminants as part of the
Stage 2 site investigation;
F) One
or more tables comparing the analytical results of the samples collected to
date to the most stringent Tier 1 remediation objectives of 35 Ill. Adm. Code
742 for the applicable indicator contaminants; and
G) For soil borings and groundwater
monitoring wells installed as part of the Stage 2 site investigation, soil
boring logs and monitoring well construction diagrams meeting the requirements
of Sections
734.425
and
734.430
of this Part; and
3) A
Stage 3 sampling plan that includes, but is not limited to, the following:
A) A narrative justifying the activities
proposed as part of the Stage 3 site investigation;
B) A map depicting the location of soil
borings and groundwater monitoring wells proposed to identify the extent of
soil and groundwater contamination beyond the site's property boundaries that
exceeds the most stringent Tier 1 remediation objectives of 35 Ill. Adm. Code
742 for the applicable indicator contaminants; and
C) The depth and construction details of the
proposed soil borings and groundwater monitoring wells.
c) Upon completion of the Stage 3 site investigation the owner or operator must proceed with the submission of a site investigation completion report that meets the requirements of Section 734.330 of this Part.
Disclaimer: These regulations may not be the most recent version. Illinois may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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