We, the EPA, are taking final action to find that the State of Texas failed to submit the required State Implementation Plan (SIP) for the Dallas/Fort Worth (DFW) ozone nonattainment area, as required by the Federal Clean Air Act (Act). The required submittal is the serious area plan requirements for attainment of the ozone National Ambient Air Quality Standards (NAAQS). The deadline for the State to make the submittal was March 20, 1999. The State submitted a SIP for the DFW area on March 18, 1999. The submittal included an attainment demonstration, a Rate-Of- Progress (ROP) Plan, and revisions to the State's rules for Nitrogen Oxides (NO<INF>X</INF>) and Volatile Organic Compounds (VOC) Reasonably Available Control Technology (RACT), and NO<INF>X</INF> New Source Review, to make them applicable to the DFW area. We find that the attainment demonstration is incomplete because it does not demonstrate, based on photochemical modeling, that the SIP will result in attainment as expeditiously as practicable but no later than November 15, 1999, as required by the Act. We find that the ROP Plan is incomplete because it does not demonstrate a rate of progress in emission reductions of at least three percent-per-year, after accounting for growth, during the 1997 to 1999 period as required by the Act. The finding of an incomplete submittal for the attainment demonstration and the ROP Plan triggers the 18-month time clock for mandatory application of sanctions and a two-year time clock for a Federal Implementation Plan (FIP) under the Act. This action is consistent with the Act's mechanism for assuring timely SIP submissions.