§ 146.4 - Criteria for exempted aquifers.  


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  • § 146.4 Criteria for exempted aquifers.

    An aquifer or a portion thereof which meets the criteria for an “underground source of drinking water” in § 146.3 may be determined under § 144.7 of this chapter to be an “exempted aquifer” for Class I-V wells if it meets the criteria in paragraphs (a) through (c) of this section. Class VI wells must meet the criteria under paragraph (d) of this section:

    (a) It does not currently serve as a source of drinking water; and

    (b) It cannot now and will not in the future serve as a source of drinking water because:

    (1) It is mineral, hydrocarbon or geothermal energy producing, or can be demonstrated by a permit applicant as part of a permit application for a Class II or III operation to contain minerals or hydrocarbons that considering their quantity and location are expected to be commercially producible.

    (2) It is situated at a depth or location which makes recovery of water for drinking water purposes economically or technologically impractical;

    (3) It is so contaminated that it would be economically or technologically impractical to render that water fit for human consumption; or

    (4) It is located over a Class III well mining area subject to subsidence or catastrophic collapse; or

    (c) The total dissolved solids content of the ground water is more than 3,000 and less than 10,000 mg/l and it is not reasonably expected to supply a public water system.

    (d) The areal extent of an aquifer exemption for a Class II enhanced oil recovery or enhanced gas recovery well may be expanded for the exclusive purpose of Class VI injection for geologic sequestration under § 144.7(d) of this chapter if it meets the following criteria:

    (1) It does not currently serve as a source of drinking water; and

    (2) The total dissolved solids content of the ground water is more than 3,000 mg/l and less than 10,000 mg/l; and

    (3) It is not reasonably expected to supply a public water system.

    [45 FR 42500, June 24, 1980, as amended at 47 FR 4998, Feb. 3, 1982; 48 FR 14293, Apr. 1, 1983; 75 FR 77291, Dec. 10, 2010]