EPA is taking direct final action approving a State Implementation Plan (SIP) revisions submitted by the State of South Dakota on August 8, 2006. The August 8, 2006 submittal revises the Administrative Rules of South Dakota, Air Pollution Control Program, by modifying the chapters pertaining to definitions, ambient air quality, air quality episodes, operating permits for minor sources, performance testing, control of visible emissions, and continuous emission monitoring systems. The intended effect of this action is to make these revisions federally enforceable. We are also announcing that on July 19, 2007, we updated the delegation of authority for the implementation and enforcement of the New Source Performance Standards to the State of South Dakota. These actions are being taken under sections 110 and 111 of the Clean Air Act.