The EPA is taking direct final action to approve Yolo-Solano Air Quality Management District (District) Rule 3.1--General Permit Requirement, Rule 3.2--Exemptions, Rule 3.4--New Source Review, Rule 3.14--Emission Reduction Credits, and Rule 3.15--Priority Reserve. EPA is approving these rules for the purpose of meeting requirements of the Clean Air Act, as amended in 1990 (CAA or Act) with regard to new source review (NSR) in areas that have not attained the national ambient air quality standards (NAAQS). This approval action will incorporate these rules into the federally approved State Implementation Plan (SIP) for California. The rules were submitted by the State to satisfy certain Federal requirements for an approvable NSR SIP. Thus, EPA is finalizing the approval of these rules into the California SIP under provisions of the CAA regarding EPA action on SIP submittals, SIPs for national primary and secondary ambient air quality standards and plan requirements for nonattainment areas. EPA is taking this action without prior proposal because the Agency views this as a non-controversial amendment and anticipates no adverse comments.