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Well Class and Type Codes
<br /> Class I Wells used to inject waste below the deepest underground source of drinking
<br /> water.
<br /> Type 661" Nonhazardous industrial disposal well
<br /> "M" Nonhazardous municipal disposal well
<br /> "W" Hazardous waste disposal well injecting below USDWs
<br /> "X" Other Class I wells (not included in Type "I," M,"or "W")
<br /> Class II Oil and gas production and storage related injection wells.
<br /> Type "D" Produced fluid disposal well
<br /> "R" Enhanced recovery well
<br /> "H" Hydrocarbon storage well (excluding natural gas)
<br /> "X" Other Class II wells (not included in Type "D," "R," or"H")
<br /> Class III Special process injection wells.
<br /> Type "G" Solution mining well
<br /> "s" Sulfur mining well by Frasch process
<br /> "U" Uranium mining well (excluding solution mining of conventional mines)
<br /> "X" Other Class III wells (not included in Type "G," "S," or"U")
<br /> Other Classes Wells not included in classes above.
<br /> Class V wells which may be permitted under§144.12.
<br /> Wells not currently classified as Class I, II, III, or V.
<br /> Attachments to Permit Application
<br /> Class Attachments
<br /> I new well A, B, C, D, F, H — S, U
<br /> existing A, B, C, D, F, H — U
<br /> II new well A, B, C, E, G, H, M, Q, R; optional — I, J, K, O, P, U
<br /> existing A, E, G, H, M, Q, R, — U; optional —J, K, O, P, Q
<br /> Ill new well A, B, C, D, F, H, I, J, K, M —S, U
<br /> existing A, B, C, D, F, H, J, K, M — U
<br /> Other Classes To be specified by the permitting authority
<br /> EPA Form 7520-6(8-01) page 2 of 6
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