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 740.420 - Comprehensive Site Investigation

Current through Register Vol. 48, No. 28, July 12, 2024
The comprehensive site investigation is designed to identify
				  all recognized environmental conditions and all related contaminants of concern
				  that may be expected to exist at a remediation site. The comprehensive site
				  investigation shall be performed in two phases as set forth in subsections
				  740.420(a) and (b).
a) Unless an
				alternative is approved by the Agency, the phase I environmental site
				assessment shall be designed and implemented in accordance with the procedures
				for such assessments set forth in "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.
b) The phase II
				environmental site assessment shall determine the nature, concentration,
				direction and rate of movement, and extent of the contaminants of concern at
				the remediation site and the significant physical features of the remediation
				site and vicinity that may affect contaminant fate and transport and risk to
				human health, safety and the environment. At a minimum, the phase II
				environmental site assessment shall include:
1) Sampling, analyses, and field screening
				measurements indicating the concentrations of contaminants, if any, from the
				Target Compound List at Appendix A of this Part and any other contaminants
				whose presence has been indicated by the phase I environmental site assessment.
				Based on the phase I environmental site assessment, the Agency may add or
				delete contaminants from the Target Compound List for sampling, analyses, and
				field screening measurements;
2)
				Characterization of sources and potential sources of recognized environmental
				conditions and the related contaminants of concern, identifying:
A) The sources or potential sources of
				contamination;
B) The contaminants
				of concern;
C) Statutory or
				regulatory classification of the contaminants of concern and contaminated
				materials (e.g., hazardous waste, hazardous substance, special
				waste);
3)
				Characterization of the extent of contaminants of concern, identifying:
A) The actual contaminated medium or
				media;
B) The three-dimensional
				configuration of contaminants of concern with concentrations delineated;
				and
C) The nature, direction, and
				rate of movement of the contaminants of concern;
4) Characterization of present and
				post-remediation exposure routes, identifying:
A) All natural and man-made pathways that are
				on the remediation site, in rights-of-way attached to the remediation site, or
				in any areas surrounding the remediation site that may be adversely affected as
				a result of a release (from the recognized environmental conditions) and
				whether there is evidence of migration of contaminants of concern, in either
				solution or vapors, along such pathways that may potentially threaten human or
				environmental receptors or that may cause explosions in basements, crawl
				spaces, utility conduits, storm or sanitary sewers, vaults or other
				spaces;
B) The locations of any
				human and environmental receptors and receptor exposure routes; and
C) Current and post-remediation uses of
				affected or potentially affected land, groundwater, surface water, and
				sensitive habitats; and
5) Characterization of significant physical
				features of the remediation site and vicinity that may affect contaminant fate
				and transport and risk to human health, safety and the environment.