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OZONE (O3)
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
RACT SIP
The Clean Air Act requires SIP's for non-attainment areas to require emission controls that are economically and technologically feasible. Emissions control technologies that meet these criteria are known as "RACT". The phase 2 rule sets forth guidelines for making RACT determinations in 8-hour Ozone non-attainment areas. (70 FR 71612)
FINAL 2009 REASONABLY AVAILABLE CONTROL TECHNOLOGY STATE IMPLEMENTATION PLAN (2009 RACT SIP)
Negative Declaration is available in the CEQA page
PARTICULATE
MATTER 10 (PM10)
Please visit our public participation page under "Past Public Hearings" for a detail of the information provided to the Imperial County Air Pollution Control Board of Directors on August 11, 2009.
