ARSD 74:52:03:16. Effluent limits for metals

All permit effluent limits, standards, or prohibitions for a metal shall be expressed in terms of "total recoverable metal" as defined in 40 C.F.R. Part 136 (July 1, 2016) except under one or more of the following circumstances: (1) An applicable effluent standard or limit has been promulgated under the CWA and specifies the limit for the metal in the dissolved, valent, or total form; (2) In establishing permit limits case by case, the limit on the metal is expressed in the dissolved, valent, or total form to carry out the provisions of the CWA; (3) All approved analytical methods for the metal inherently measure only its dissolved form; or (4) In establishing permit limits to comply with chapter 74:51:01 the limit for the metal is expressed in the dissolved, valent, or total form.