Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 620 - GROUNDWATER QUALITY
Subpart C - NONDEGRADATION PROVISIONS FOR APPROPRIATE GROUNDWATERS
Section 620.305 - Preventive Notification Procedures

Universal Citation: 35 IL Admin Code ยง 620.305

Current through Register Vol. 48, No. 38, September 20, 2024

a) Pursuant to groundwater quality monitoring as described in Section 620.302, a preventive notification must occur whenever a contaminant:

1) Listed under Section 620.310(a)(3)(A) is detected (except due to natural causes) in Class I groundwater; or

2) Denoted as a carcinogen under Section 620.410(b) is detected in Class I groundwater; or

3) Subject to a standard under Section 620.430 is detected (except due to natural causes) in Class III groundwater.

b) When a preventive notification is required for groundwater which is monitored by a regulated entity for the subject contaminant, the owner or operator of the site shall confirm the detection by resampling the monitoring well. This resampling shall be made within 30 days of the date on which the first sample analyses are received. The owner or operator shall provide a preventive notification to the appropriate regulatory agency of the results of the resampling analysis within 30 days of the date on which the sample analyses are received, but no later than 90 days after the results of the first samples were received.

c) When a preventive notification is required for groundwater which is monitored by a regulatory agency, such agency shall notify the owner or operator of the site where the detection has occurred. The owner or operator shall confirm the detection by resampling within 30 days of the date of the notice by the regulatory agency. The owner or operator shall provide preventive notification to the regulatory agency of the results of the resampling analysis within 30 days of the date on which the sample analyses are received, but no later than 90 days after the results of the first samples were received.

d) When a preventive notification of a confirmed detection has been provided by an owner or operator pursuant to this Section, additional detections of the same contaminant do not require further notice, provided that the groundwater quality conditions are substantially unchanged or that preventive response is underway for such contaminant.

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