The EPA is taking a final action finding that the State of California has failed to submit revisions to its State Implementation Plans (SIPs) for three ozone nonattainment areas to satisfy certain requirements of the Clean Air Act (CAA) for the 1-hour ozone National Ambient Air Quality Standards (NAAQS). To accompany this action we are issuing additional guidance to states on developing the required SIP revisions. Under the CAA and EPA's implementing regulations, states with 1-hour ozone nonattainment areas classified as Severe or Extreme were required by the provisions of CAA sections 181(b)(4) and 182(d)(1)(3) to submit by December 31, 2000, SIPs to satisfy CAA section 185. By this action, EPA is making a finding of failure to submit the required SIPs for the State of California for three 1-hour ozone nonattainment areas. With the issuance of additional EPA guidance to states on developing section 185 fee program SIPs, California will be able to complete development and promulgation of these programs. According to the CAA, for each area subject to this finding, EPA must affirmatively find that California has submitted the required plan revision within 18 months of the effective date of this finding, or the offset sanction must apply in that area. Additionally, according to the CAA, if EPA has still not affirmatively determined that a state has submitted the required plan for an area within 6 additional months, the highway funding sanction must apply in that area. Lastly, the CAA requires that no later than 2 years after the effective date of this finding, EPA must promulgate a Federal Implementation Plan (FIP) if the state has not submitted and EPA has not approved the required SIP.