(b) A district which has entered into an agreement with a council of governments or a regional agency to jointly develop a plan for transportation control measures shall develop the plan in accordance with all of the following:

1. (1) The district shall establish the quantity of emission reductions from transportation sources necessary to attain state and federal ambient air standards.
2. (2) The council of governments or regional agency, in cooperation with the district and any other person or entity authorized by the council of governments or regional agency, shall develop and adopt a plan to control emissions from transportation sources which will achieve the emission reductions established under paragraph (1). The plan shall include, at a minimum, a schedule for implementing transportation control measures, identification of potential implementing agencies and any agreements entered into by agencies to implement portions of the plan, and procedures for monitoring the effectiveness of and compliance with the measures in the plan. The council of governments or regional agency shall submit the plan to the district for its adoption according to a reasonable schedule developed by the district in consultation with the council of governments or regional agency.

3. (3) Upon receipt of the plan submitted by the council of governments or regional agency, the district shall review and approve or disapprove the plan in the following manner:

   1. (A) The district shall review, adopt, and enforce the plan if it meets the criteria established by the district pursuant to paragraph (1) and has been submitted pursuant to the schedule established under paragraph (2).
   2. (B) If the district determines that the plan does not meet the criteria established pursuant to paragraph (1), the district shall return the plan to the council of governments or regional agency with comments which identify the reasons the plan does not meet the criteria established pursuant to paragraph (1). Within 45 days, the council of governments or regional agency shall review the district’s comments, revise the plan to meet the criteria established under paragraph (1), and resubmit the plan to the district. The district shall review and approve the revised plan if it meets the criteria established by the district pursuant to paragraph (1) and has been resubmitted to the district within 45 days.
   3. (C) If the plan is not submitted pursuant to the schedule established under paragraph (2), or if a plan revised by a council of governments or regional agency and resubmitted to a district pursuant to this subparagraph does not meet the criteria established under paragraph (1), the district shall develop, adopt, and enforce an alternative plan for transportation control measures.
4. (4) Whenever the district revises its establishment of the quantity of emission reductions from transportation sources necessary to attain state and federal ambient air standards, the plan shall be revised, adopted, and enforced in accordance with paragraphs (1), (2), and (3).

(d) Notwithstanding subdivision (b), a district located in a county of the third class shall develop a plan for transportation control measures as follows:

1. (1) The district, in consultation with the council of governments, shall develop, approve, and adopt criteria under which the plan shall be developed.
2. (2) The council of governments shall develop and adopt a plan for transportation control measures which meets the criteria established by the district, and shall submit the plan to the district for its review and adoption according to a reasonable schedule developed by the district in consultation with the council of governments.
3. (3) Upon receipt of the plan submitted by the council of governments, the district shall review and approve the plan if it meets the criteria established by the district pursuant to paragraph (1) and has been submitted pursuant to the schedule established under paragraph (2). If the district determines that the plan does not meet the criteria established pursuant to paragraph (1) or if the plan is not submitted pursuant to the schedule established under paragraph (2), the district shall develop and adopt an alternative plan for transportation control measures.

(e) A district may delegate any function with respect to the implementation of transportation control measures to any local agency, if all of the following conditions are met:

1. (1) The local agency submits to the district an implementation plan that provides adequate resources to adopt and enforce the measures, and the district approves the plan.
2. (2) The local agency adopts and implements measures at least as stringent as those in the district plan.
3. (3) The district adopts procedures to review the performance of the local agency in implementing the measures to ensure compliance with the district plan.
4. (4) Multiple site employers with more than one regulated worksite in the district have the option of complying with the district rule and reporting directly to the district. Employers that exercise this option shall be exempt from the local agency trip reduction measure.