Finding of Failure To Submit Required State Implementation Plans for Carbon Monoxide; Arizona; Phoenix Carbon Monoxide Nonattainment Area

Under the Clean Air Act (Act), EPA is taking final action to find that the State of Arizona has failed to make required State Implementation Plan (SIP) submittals for the metropolitan Phoenix carbon monoxide (CO) nonattainment area. These required submittals are the serious area plan requirements for attainment of the CO national ambient air quality standards (NAAQS). The deadline for these submittals was February 28, 1998. This final action triggers the 18-month time clock for mandatory application of sanctions and 2-year time clock for a Federal Implementation Plan under the Act. This action is consistent with the Act's mechanism for assuring timely SIP submissions.