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The Antelope Valley Air Quality Management District (AVAQMD) is proposing the adoption of an updated 2015 8-Hour Reasonably Available Control Technology – State Implementation Plan Analysis (RACT SIP Analysis). This update is in response to the United States Environmental Protection Agency's (USEPA) lowering of the primary ozone National Ambient Air Quality Standard (NAAQS) from 0.084 parts per million (ppm) to 0.075 ppm.

The shift to the lower NAAQS standard, which was effective May 27, 2008, prompted the USEPA to require all non-attainment areas submit an updated RACT SIP Analysis. The purpose of the updated RACT SIP Analysis is to ensure that the district evaluates the current rules to ensure that the most current RACT is incorporated. Therefore, the AVAQMD has assessed the district rules and all of its major sources of ozone precursors to ensure that the current rules satisfy RACT.

The RACT SIP Analysis draws upon the 2006 RACT SIP Analysis and the 2014 Supplement, which were previously submitted to the USEPA for review. The current RACT SIP Analysis provides a complete determination of the district's obligations. After review, the district has determined that there may be rules that will require further evaluation or amendments to comply with current RACT requirements. The district has identified the following rules that will likely be amended based on the RACT SIP Analysis: Rule 462, Rule 463, Rule 1102, Rule 1104, Rule 1107, Rule 1110.2, Rule 1141.1, Rule 1145, and Rule 1146.