EPA is proposing to approve and conditionally approve revisions to the Antelope Valley Air Quality Management District (AVAQMD or “District”) portion of the California State Implementation Plan (SIP). These revisions concern the District's demonstration regarding Reasonably Available Control Technology (RACT) requirements for the 1997 8-hour ozone and the 2008 8-hour ozone National Ambient Air Quality Standards (NAAQS or “standard”) in the Antelope Valley ozone nonattainment area. The EPA previously proposed to partially approve and partially disapprove AVAQMD's RACT SIP submittals for the 1997 and 2008 8-hour ozone NAAQS (2006 and 2015 RACT SIPs) because we found that existing District rules implemented RACT for many, but not all, applicable sources. The AVAQMD has since addressed or committed to address these deficiencies. Therefore, we withdraw our previous proposed partial approval and partial disapproval of the AVAQMD 2006 and 2015 RACT SIPs, and now propose to partially approve and partially conditionally approve them into the California SIP. The EPA is also proposing to approve AVAQMD negative declarations into the SIP for the 1997 and the 2008 ozone standards.
We are proposing action on local SIP revisions under the Clean Air Act (CAA or Act). We are taking comments on this proposal and plan to follow with a final action.
For Further Information
Nancy Levin (email@example.com)
EPA Region IX