Illinois Administrative Code › Title 8 - AGRICULTURE AND ANIMALS › Part 259 - AGRICHEMICAL FACILITY RESPONSE ACTION PROGRAM › Subpart B - SOIL AND GROUNDWATER CLEANUP OBJECTIVES › Section 259.220 - Pesticides

Current through Register Vol. 48, No. 28, July 12, 2024
a) If the pesticide
				concentrations in soil are equal to or greater than the remediation suitability
				determination levels in Appendix A of this Part, the soil is considered a high
				risk to cause an exceedence of a Class I or Class III groundwater quality
				standard or a health advisory level and is also considered to contain a
				hazardous constituent, subject to all applicable hazardous waste management
				requirements and restrictions (35 Ill. Adm. Code: Subtitle G: Chapter I:
				Subchapter c), and not suitable for land application pursuant to 8 Ill. Adm.
				Code 258.
b) Notwithstanding the
				requirements of subsection (a) of this Section, applicants may demonstrate that
				the contaminated soils may be safely land applied pursuant to 8 Ill. Adm. Code
				258.150.
c) If the pesticide
				concentrations in soil are less than the remediation suitability determination
				levels in Appendix A of this Part, but are equal to or greater than the default
				soil cleanup objectives in Appendix B, the soil is considered a moderate risk
				to cause an exceedence of a groundwater quality standard or a health advisory
				level, and a corrective action plan to remediate the past contamination may be
				submitted to the Department and the Board for review. The soil may be suitable
				for the land application treatment program pursuant to 8 Ill. Adm. Code
				258.
d) If the pesticide
				concentrations in soil are less than the default SCOs in Appendix B of this
				Part, the pesticide concentrations are considered below regulatory concern and
				the facility may apply for a notice of closure in accordance with Subpart
				E.
e) If the pesticide
				concentrations are less than the remediation suitability determination levels
				in Appendix A, but equal to or greater than the default SCOs in Appendix B, the
				applicant may undertake a detailed site assessment as described in Section
				259.340
				to develop the information necessary to propose site-specific SCOs, using the
				equations in Section
				259.350(a).
				All site-specific cleanup objectives are subject to Board approval.
f) Pesticide concentrations in soils proposed
				to remain in place at the conclusion of corrective actions may not exceed the
				default SCOs in Appendix B, unless appropriate engineering barriers, in
				conjunction with necessary institutional controls, are approved as part of a
				corrective action plan.
g) If soil
				samples at a facility contain pesticides for which default SCOs are not listed
				in Appendix B, the applicant shall consult with the Department to develop an
				appropriate SCO.
h) The default
				SCOs for pesticides for surface soils in Appendix B apply to the upper 12
				inches of the soil and any soil/gravel mixture within 12 inches of land
				surface. The subsurface SCOs for pesticides apply from 12 inches below land
				surface to 60 inches below land surface.
i) Default surface SCOs for pesticides are
				calculated using the equations in Section
				259.350(a)
				and an organic carbon content (foc) of 0.008. The
				subsurface SCOs for pesticides are calculated using an
				foc of 0.002. If pesticides are present in soil at
				depths greater than 60 inches below land surface, the applicant shall measure
				the foc of at least 2 soil samples representative of the
				interval between 60 inches and the maximum depth at which pesticides are
				present in each boring within the area of contaminated soil. The variable
				foc may not be measured in soil samples with visible
				evidence of pesticide contamination. The measured foc
				shall be used in the equation in Section
				259.350(a)
				to calculate the soil cleanup objective for contaminated soil below a depth of
				60 inches.