Approval and Promulgation of Implementation Plans; California State Implementation Plan Revision; Sacramento Metropolitan Air Quality Management District (SMAQMD), Mojave Desert Air Quality Management District (MDAQMD), and the Ventura County Air Pollution Control District (VCAPCD) as Revisions to the California State Implementation Plan (SIP)

EPA is taking direct final action to approve revisions to the California State Implementation Plan (SIP). The revisions concern rules from Sacramento Metropolitan Air Quality Management District (SMAQMD), Mojave Desert Air Quality Management District (MDAQMD), and the Ventura County Air Pollution Control District (VCAPCD) as revisions to the California State Implementation Plan (SIP). SMAQMD's Rule 414 controls emissions of oxides of nitrogen from natural gas-fired water heaters; MDAQMD's Rule 1157 controls emissions from boilers and process heaters; and VCAPCD's Rule 74.16 controls emissions of oxides of nitrogen from oilfield drilling operations. This approval action will incorporate these rules into the Federally approved SIP. The intended effect of approving of these rules is to regulate emissions of oxides of nitrogen (NO<INF>X</INF>) in accordance with the requirements of the Clean Air Act, as amended in 1990 (CAA or the Act). Thus, EPA is finalizing the approval of these revisions into the California SIP under provisions of the CAA regarding EPA actions on SIP submittals, SIPs for national primary and secondary ambient air quality standards (NAAQS), and plan requirements for nonattainment areas.