Ill. Admin. Code tit. 35, § 620.305 - Preventive Notification Procedures
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.
Notes
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