Confining zone

Confining zone means a geologic formation, group of formations, or part of a formation stratigraphically overlying the injection zone that acts as barrier to fluid movement. For Class VI wells operating under an injection depth waiver, confining zone means a geologic formation, group of formations, or part of a formation stratigraphically overlying and underlying the injection zone(s).

Source

40 CFR § 146.81

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Scoping language

This subpart establishes criteria and standards for underground injection control programs to regulate any Class VI carbon dioxide geologic sequestration injection wells.

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