Wis. Admin. Code Department of Natural Resources NR 220.30
The purpose of this subchapter is to establish the criteria and standards to be used in determining whether effluent limitations alternative to those required by chs. NR 221 to 297 or by federal effluent limitation guidelines should be included in a WPDES permit for a discharger because factors relating to the discharger's facilities, equipment, processes, or other factors related to the discharger are fundamentally different from the factors considered by the department or the EPA in development of the effluent limitation guidelines. This subchapter also provides expedited variance procedures for fundamentally different factors variances and for other variances under 33 USC 1311(c).
Wis. Admin. Code Department of Natural Resources NR 220.30