Section 620.302  Applicability of Preventive Notification and Preventive Response Activities

a)         Preventive notification and preventive response activities, as specified in Sections 620.305 through 620.310, apply to:

1)         Class I groundwater under Section 620.210(a)(1), (a)(2), (a)(3), (a)(5), or (a)(6) that is monitored by any person specified in subsection (b); and

2)         Class III groundwater that is monitored by any person specified in subsection (b).

b)         For subsection (a), the persons that conduct groundwater monitoring are:

1)         An owner or operator of a regulated entity required to perform groundwater quality monitoring under State or federal law or regulation;

2)         An owner or operator of a public water supply well who conducts groundwater quality monitoring;

3)         A State agency that is authorized to conduct, or is the recipient of, groundwater quality monitoring data (e.g., Illinois Environmental Protection Agency, Department of Public Health, Department of Agriculture, Office of State Fire Marshal, or Department of Natural Resources); or

4)         An owner or operator of a facility that conducts groundwater quality monitoring under State or federal judicial or administrative order.

c)         If a contaminant exceeds a standard specified in Section 620.410 or Section 620.430, the appropriate remedy is corrective action and Sections 620.305 and 620.310 do not apply.

(Source:  Amended at 49 Ill. Reg. 4488, effective March 28, 2025)