Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 704 - UIC PERMIT PROGRAM
Subpart B - PROHIBITIONS
Section 704.129 - Transitioning from a Class II Injection Well to a Class VI Injection Well

Universal Citation: 35 IL Admin Code ยง 704.129

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

a) The owner or operator of a Class II injection well that is injecting carbon dioxide into an oil and gas reservoir for the primary purpose of long-term storage must apply for and obtain a Class VI injection well geologic sequestration permit when there is an increased risk to a USDW compared to usual Class II injection well operations. In determining if there is an increased risk to a USDW, the owner or operator must consider the factors specified for Agency consideration in subsection (b).

b) The Agency must determine when there is an increased risk to a USDW from injecting carbon dioxide into an oil and gas reservoir for the primary purpose of long-term storage compared to usual Class II injection well operations and that a Class VI injection well permit is required. In order to make this determination, the Agency must consider the following factors:

1) Any increase in reservoir pressure within the injection zones;

2) Any increase in carbon dioxide injection rates;

3) Any decrease in reservoir production rates;

4) The distance between the injection zones and USDWs;

5) The suitability of the Class II injection well area of review delineation;

6) The quality of abandoned well plugs within the area of review;

7) The owner's or operator's plan for recovery of carbon dioxide after the cessation of injection;

8) The source and properties of injected carbon dioxide; and

9) Any additional site-specific factors that the Agency determines are necessary to determine whether the injection poses greater risk than usual Class II operations.

BOARD NOTE: Derived from 40 CFR 144.19 (2017).

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