On December 3, 2009 the US EPA issued a final ruling determining that the Imperial County "moderate" 8-hour ozone non-attainment area attained the 1997 8-hour standard. This determination effectively suspends the requirement for the state to submit an attainment demonstration, a reasonable further progress plan, contingency measures and other planning requirements for so long as Imperial County continues to attain the 1997 8-hour ozone standard.
Because this determination does not constitute a re-designation to attainment under the Clean Air Act section 107(d)(3) the designation status will remain "moderate" non-attainment for the 1997 8-hour ozone standard.
However, Imperial County is required to submit for US EPA approval a "Modified" 2009 8-hour Ozone Air Quality Management Plan.
FINAL 2009 8-HOUR OZONE MODIFIED AIR QUALITY MANAGEMENT PLAN
Negative Declaration is available in the CEQA page