Enclosure

Transportation Conformity Adequacy Review 

Northern Ada County PM10 State Implementation Plan, Maintenance Plan: Ten-Year Upda

submitted March 11, 2013 (and clarification on April 16, 2013)

Adequacy Determination of Motor Vehicle Emissions Budgets (MVEBs) 40 CFR 93.118 (e) (4)

 (4) EPA will not find a motor vehicle emissions budget in a submitted control strategy implementation plan revi

plan to be adequate for transportation conformity purposes unless the following minimum criteria are satisfied: 

Adequacy Review Criteria Is this 

Criteria Satisfied? 

Reference in SIP Documents/Comments 

 (i) The submitted control strategy implementation plan revision or maintenance plan was endorsed by the Governor (or his or her designee) and was subject to a State public hearing; 

Yes This plan was submitted by the Governor of Idaho

Fransen, the Director of the Idaho Department of EThe plan was the subject of a public hearing held in 16, 2012. The certificate of hearing is included in A

 (ii) Before the control strategy implementation plan or maintenance plan was submitted to EPA, consultation among federal, State, and local agencies occurred; full implementation plan documentation was provided to EPA; and EPA's stated concerns, if any, were addressed; 

Yes Consultation occurred among Federal, State, and lo

the maintenance plan was submitted to the EPA. Tfull implementation plan documentation including Appendix A, boundary description in Appendix B, 

in Appendix C, the emission inventory in Appendiused for MOVES onroad emissions modeling and pcomputations in Appendix E, and documentation threquirements were met in Appendix F. 

 (iii) The motor vehicle emissions budget(s) is clearly identified and precisely quantified; 

Yes Section 5 of the maintenance plan clearly identifies 

Northern Ada County which are listed in the follow

MVEBs for Northern Ada County PM10 M

(tons per day) 

Budget Year PM10 NOx 

2008 31.0 29.5 2015 42.9 29.5 2023 60.1 34.2 
 (iv) The motor vehicle emissions budget(s), when 

considered together with all other emissions sources, is consistent with applicable requirements for reasonable further progress, attainment, or maintenance (whichever is relevant to the given implementation plan submission); 

Yes The MVEBs are established based on the emission

in Appendix D. The MVEBs, when considered wit

sources, are consistent with the requirements for coof the PM10 national ambient air quality standard. 

 (v) The motor vehicle emissions budget(s) is consistent with and clearly related to the emissions inventory and the control measures in the submitted control strategy implementation plan revision or maintenance plan; and 

Yes The MVEBs are established based on the emission

control measures included in the plan. 

 (vi) Revisions to previously submitted control strategy implementation plans or maintenance plans explain and document any changes to previously submitted budgets and control measures; impacts on point and area source emissions; any changes to established safety margins (see Sec. 93.101 for definition); and reasons for the changes (including the basis for any changes related to emission factors or estimates of vehicle miles traveled). 

Yes The new MVEBs are based on MOVES and are pr

an update of the MVEBs established in the previouAppendix E provides a discussion of the changes to emissions modeling and road dust emissions comp

93.118 (e) (5) Before determining the adequacy of a submitted motor vehicle emissions budget, EPA will review the State's compilation of public comments and response to comments that are required to be submitted with any implementation plan. EPA will document its consideration of such comments and responses in a letter to the State indicating the adequacy of the submitted motor vehicle emissions budget. 

Yes One comment related to the MVEBs was submitted 

public hearing process. The commenter requested adifferences in the State’s current and previous PM1and a justification for the State’s reliance on an emdiffered from the factor previously relied-upon in tbudget. The EPA considered the comment and the EPA sent a letter to the State on May 17, 2013, sub

of the EPA comment period stating that the EPA foin the submitted maintenance plan to be adequate ftransportation conformity.