Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 740 - SITE REMEDIATION PROGRAM › Subpart D - SITE INVESTIGATIONS, DETERMINATION OF REMEDIATION OBJECTIVES, PREPARATION OF PLANS AND REPORTS › Section 740.425 - Site Investigation Report - Comprehensive Site Investigation

Current through Register Vol. 48, No. 28, July 12, 2024
a) Site
				investigation results for both phase I and phase II of the comprehensive site
				investigation shall be combined into one Site Investigation Report.
b) A Site Investigation Report for a
				comprehensive site investigation shall include, but not be limited to, the
				following chapters:
1) Executive summary. This
				chapter shall identify the objectives of the site investigation and the
				technical approach utilized to meet such objectives. It shall state whether
				recognized environmental conditions were identified and the data limitations in
				the assessment;
2) Site
				characterization. This chapter shall include the compilation of all sources
				reviewed and information obtained as a result of the site investigation under
				Section
				740.420
				of this Part, including but not limited to:
A) Sources consulted or reviewed. This
				subchapter shall contain a list of reference documents used in completing the
				site investigation;
B) Site
				history. This subchapter shall present a chronological summary of the historic
				uses of the remediation site as prescribed by "Standard Practice for
				Environmental Site Assessments: Phase I Environmental Site Assessment Process"
				(ASTM E 1527-00), incorporated by reference at Section
				740.125
				of this Part;
C) Site description.
				This subchapter shall describe the regional location, pertinent boundary
				features, general facility physiography, geology, hydrogeology, existing and
				potential migration pathways and exposure routes, and current and
				post-remediation uses of the remediation site and surrounding areas that are
				immediately adjacent to the remediation site;
D) Site base map(s) meeting the requirements
				of Section
				740.210(a)(7)
				 and including the following:
i) The sources or potential sources of the
				contaminants of concern, spill areas, and other suspected areas for any or all
				contaminants of concern;
ii)
				On-site and off-site injection and withdrawal wells; and
iii) All buildings, tanks, piles, utilities,
				paved areas, easements, rights-of-way and other features, including all known
				past and current product and waste underground tanks or piping; and
E) A legal description or
				reference to a plat showing the boundaries of the remediation site, or, for a
				Federal Landholding Entity, a common address, notations in any available
				facility master land use plan, site specific GIS or GPS coordinates, plat maps,
				or any other means that identifies the site in question with
				particularity;
3)
				Site-specific sampling plan. This chapter shall indicate those applicable
				physical and chemical methods utilized for contaminant source investigations,
				soil and sediment investigations, hydrogeological investigations, surface water
				investigations, and potential receptor investigations;
4) Documentation of field activities. This
				chapter shall include the results of the field activities to determine physical
				characteristics. At a minimum, this chapter shall include the following
				elements:
A) Narrative description of the
				field activities conducted during the investigation;
B) The quality assurance project plan
				utilized to document all monitoring procedures (e.g., sampling, field
				measurements and sample analyses) performed during the investigation, so as to
				ensure that all information, data and resulting decisions are technically
				sound, statistically valid, and properly documented; and
C) Presentation of the data in an appropriate
				format (e.g., tabular and graphical displays) such that all information is
				organized and presented logically and that relationships between the different
				investigations for each medium are apparent;
5) Endangerment assessment. This chapter
				shall analyze the results of the field activities and characterize the extent
				of contamination (qualitative and quantitative) for contaminants of concern and
				compare the remediation site information with the applicable provisions of 35
				Ill. Adm. Code 742. This chapter shall:
A)
				Describe any recognized environmental conditions, evaluate exposure routes,
				including threatened releases, and evaluate exposure routes excluded under 35
				Ill. Adm. Code 742;
B) Describe all
				conditions the LPE has determined to be de minimis along with the rationale for
				each such de minimis determination;
C) Describe the nature, concentration and
				extent of contaminants of concern within all environmental media at the
				remediation site and assess the observed and potential contaminant fate and
				transport;
D) Describe the
				significant physical features of the remediation site and vicinity that may
				affect contaminant transport and risk to human health, safety and the
				environment; and
E) Compare the
				concentrations of the contaminants of concern with the corresponding Tier 1
				remediation objectives under 35 Ill. Adm. Code 742;
6) Conclusion. This chapter shall assess the
				sufficiency of the data in the report and recommend future steps;
7) Appendices. References and data sources,
				including but not limited to field logs, well logs, and reports of laboratory
				analyses, shall be incorporated into the appendices with reports containing
				laboratory analyses of samples collected on or after January 1, 2003, including
				the following:
A) Accreditation status of the
				laboratory performing the quantitative analyses;
B) Certification by an authorized agent of
				the laboratory that all analyses have been performed in accordance with the
				requirements of 35 Ill. Adm. Code 186 and the scope of accreditation;
				and
8) Licensed
				Professional Engineer affirmation in accordance with Section
				740.410
				of this Part.