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§ 147.1655 Requirements for wells authorized by permit.
(a) The owner or operator of a Class I well authorized by permit shall install or shall ensure that the well has:
(1) Surface casing present;
(i) Extending from the surface to a depth at least 50 feet below the base of the lowermost USDW; and
(ii) Cemented back to the surface by recirculating the cement; and