(1) All transportation plans, improvement programs, and projects shall comply with the criteria in subsections (2), (3), and (4) of this section.

(2) At all times the following criteria shall be met:

(a) The conformity determination for plans, TIPs, and projects shall:

(i) Be based on the latest planning assumptions.

(ii) Be based on the latest EPA approved emission estimation model available.

(iii) Be made according to the consultation procedures contained in WAC 173-420-070.

(b) The plan and TIP shall provide for the timely implementation of TCMs from the SIP or maintenance plan.

(c) There shall be a currently conforming plan and currently conforming TIP at the time of project approval.

(d) The project shall come from a conforming plan and conforming TIP.

(e) In CO and PM10 nonattainment and maintenance areas the project shall not cause or contribute to any new localized CO or PM10 violations or increase the frequency or severity of any existing CO or PM10 violations.

(f) In PM10 nonattainment and maintenance areas the project shall comply with PM10 measures in the applicable SIP or maintenance plan.

(3) Until approval of an applicable SIP by EPA the following criteria shall also be met:

(a) Plans and TIPs:

(i) In O3 nonattainment areas the action scenario emissions shall be less than the baseline scenario emissions.

(ii) In O3 nonattainment areas the action scenario emissions shall be less than the 1990 emissions.

(iii) In all CO nonattainment areas the action scenario emissions shall be less than the baseline scenario emissions.

(iv) In all CO nonattainment areas the action scenario emissions shall be less than the 1990 emissions.

(v) In CO nonattainment areas with a design value of 12.7 ppm or greater, the emissions shall be less than or equal to the motor vehicle emissions budget.

(vi) In PM10 nonattainment areas the emissions shall be less than or equal to the motor vehicle emissions budget.

(vii) In PM10 nonattainment areas the action scenario emissions shall be less than or equal to the baseline scenario emissions or the 1990 emissions.

(b) Projects in CO nonattainment areas shall eliminate or reduce the severity and number of localized CO violations in the area substantially affected by the project.

(4) After approval of the SIP by EPA or when the maintenance plan is in effect the following criteria shall be met:

(a) The plan and TIP shall be consistent with the Motor Vehicle Emissions Budget (MVEB) in the applicable SIP or maintenance plan.

(b) No additional criteria are required for projects.