Injection Well Classes Classifications of the U.S. Environmental Protection Agency (EPA) that determine the permit requirements of an Injection Well. 1 Class I A well into which liquid hazardous wastes or other fluids are pumped down, with the fluids being injected into an underground formation below the lowest underground source of drinking water that is within a one-quarter mile radius of the well, 2 Class II A well used to dispose of fluids produced by oil and gas wells, to introduce fluids for enhanced oil recovery, or for liquid hydrocarbon storage, 3 Class III A well used to pump fluids underground for mineral extraction, 4 Class IV A well used to re-inject treated fluid from a superfund cleanup site into or above an underground formation within a one-quarter mile radius of the well (the use of these types of wells is currently banned by the EPA), 5 Class V Wells not included in Classes I–IV, mainly shallow industrial disposal wells or Recharge Wells (see Appendix B–10, Class V Injection Well Classifications and Descriptions).
Source: http://www.bvsde.paho.org/bvsacg/i/fulltext/dicciona/dicciona.pdf
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Author of the Water Words Dictionary source of text: Gary A. Horton
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