PUBLIC LAW 101-549—NOV. 15, 1990 104 STAT. 2457 includes (in addition to the sources described in section 302) any stationary source which emits, or has the potential to emit, 50 tons per year or more of carbon monoxide. "(2) WAIVERS FOR CERTAIN AREAS.—The Administrator may, on a case-by-case basis, waive any requirements that pertain to transportation controls, inspection and maintenance, or oxygenated fuels where the Administrator determines by rule that mobile sources of carbon monoxide do not contribute significantly to carbon monoxide levels in the area. "(3) GUIDEUNES. —Within 6 months after the date of the enactment of the Clean Air Act Amendments of 1990, the Administrator shall issue guidelines for and rules determining whether stationary sources contribute significantly to carbon monoxide levels in an area. ' (d) CO MILESTONE. — "(1) MILESTONE DEMONSTRATION. —By March 31, 1996, each State in which all or part of a Serious Area is located shall submit to the Administrator a demonstration that the area has achieved a reduction in emissions of CO equivalent to the total of the specific annual emission reductions required by December 31, 1995. Such reductions shall be referred to in this subsection as the milestone. "(2) ADEQUACY OF DEMONSTRATION. —A demonstration under this paragraph shall be submitted in such form and manner, and shall contain such information and analysis, as the Administrator shall require. The Administrator shall determine whether or not a State's demonstration is adequate within 90 days after the Administrator's receipt of a demonstration which contains the information and analysis required by the Administrator. "(3) FAILURE TO MEET EMISSION REDUCTION MILESTONE.— If a State fails to submit a demonstration under paragraph (1) within the required period, or if the Administrator notifies the State that the State has not met the milestone, the State shall, within 9 months after such a failure or notification, submit a plan revision to implement an economic incentive and transportation control program as described in section 182(g)(4). Such revision shall be sufficient to achieve the specific annual reductions in carbon monoxide emissions set forth in the plan by the attainment date. ' (e) MULTI-STATE CO NONATTAINMENT AREAS.— "(1) COORDINATION AMONG STATES. —Each State in which there is located a portion of a single nonattainment area for carbon monoxide which covers more than one State ('multi-State nonattainment area') shall take all reasonable steps to coordinate, substantively and procedurally, the revisions and implementation of State implementation plans applicable to the nonattainment area concerned. The Administrator may not approve any revision of a State implementation plan submitted under this part for a State in which part of a multi-State nonattainment area is located if the plan revision for that State fails to comply with the requirements of this subsection. "(2) FAILURE TO DEMONSTRATE ATTAINMENT.— If any State in which there is located a portion of a multi-State nonattainment area fails to provide a demonstration of attainment of the national ambient air quality standard for carbon monoxide in that portion within the period required under this part the
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