Wis. Admin. Code Department of Natural Resources NR 489.11
The federal conformity regulations under 40 CFR part 51 subpart W and part 93 as in effect on July 1, 1998, in addition to any existing applicable state requirements, establish the conformity criteria and procedures necessary to meet the requirements of section 176 (c) of the act (42 USC 7506(c)) until such time as this conformity implementation plan revision is approved by EPA. Following EPA approval of this revision to the applicable implementation plan, or a portion thereof, the approved state criteria and procedures govern conformity determinations and the federal conformity regulations contained in 40 CFR part 93 apply only for the portion, if any, of the state's conformity provisions that is not approved by EPA. In addition, any previously applicable implementation plan requirements relating to conformity remain enforceable until the state revises its applicable implementation plan to specifically remove them and that revision is approved by EPA.
Wis. Admin. Code Department of Natural Resources NR 489.11