EnclosureTransportation Conformity Adequacy ReviewNorthern Ada County PM10 State Implementation Plan, Maintenance Plan: Ten-Year Updatesubmitted 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 asubmitted control strategy implementation plan revision or maintenanceplan to be adequate for transportation conformity purposes unless the following minimum criteria are satisfied:Adequacy Review Criteria Is thisCriteriaSatisfied?Reference in SIP Documents/Comments(i) The submitted control strategy implementationplan revision or maintenance plan was endorsed by theGovernor (or his or her designee) and was subject to aState public hearing;Yes This plan was submitted by the Governor of Idaho’s designee, CurtFransen, the Director of the Idaho Department of Environmental Quality.The plan was the subject of a publichearing held in Boise on October16, 2012. The certificate of hearing is included in Appendix F.(ii) Before the control strategy implementation plan ormaintenance plan was submitted to EPA, consultationamong federal, State, and local agencies occurred; fullimplementation plan documentation was provided toEPA; and EPA's stated concerns, if any, were addressed;Yes Consultation occurred among Federal,State, and local agencies beforethe maintenance plan was submitted to the EPA. The submittal containsfull implementation plan documentation including legal authority inAppendix A, boundary description inAppendix B, modeling projectionsin Appendix C, the emission inventory in Appendix D, methodologiesused for MOVES onroad emissionsmodeling and paved road dustcomputations in Appendix E, and documentation that administrativerequirements were met in Appendix F.(iii) The motor vehicle emissions budget(s) is clearlyidentified and precisely quantified;Yes Section 5 of the maintenance plan clearly identifies the MVEBs forNorthern Ada County which are listed in the following table.MVEBs for Northern Ada County PM10 Maintenance Area(tons per day)Budget Year PM10 NOx VOC2008 31.0 29.5 12.62015 42.9 29.5 12.62023 60.1 34.2 17.2(iv) The motor vehicle emissions budget(s), whenconsidered together with all other emissions sources, isconsistent with applicablerequirements for reasonablefurther progress, attainment, or maintenance (whicheveris relevant to the given implementation plansubmission);Yes The MVEBs are established basedon the emissions inventory includedin Appendix D. The MVEBs, when considered with all other emissionsources, are consistent with the requirements for continued maintenanceof the PM10 national ambient air quality standard.(v) The motor vehicle emissions budget(s) isconsistent with and clearlyrelated to the emissionsinventory and the control measures in the submittedcontrol strategy implementation plan revision ormaintenance plan; andYes The MVEBs are established based on the emissions inventory andcontrol measures included in the plan.(vi) Revisions to previously submitted controlstrategy implementation plans or maintenance plansexplain and document any changes to previouslysubmitted budgets and control measures; impacts onpoint and area source emissions; any changes toestablished safety margins (see Sec. 93.101 fordefinition); and reasons for the changes (including thebasis for any changes related to emission factors orestimates of vehicle miles traveled).Yes The new MVEBs are based on MOVES and are presented in this plan asan update of the MVEBs establishedin the previous maintenance plan.Appendix E provides a discussion of the changes to the mobile sourcesemissions modeling and road dust emissions computations.93.118 (e) (5) Before determining the adequacy of asubmitted motor vehicle emissions budget, EPA willreview the State's compilation of public comments andresponse to comments that are required to be submittedwith any implementation plan. EPA will document itsconsideration of such comments and responses in a letterto the State indicating the adequacy of the submittedmotor vehicle emissions budget.Yes One comment related to the MVEBs was submitted during the State’spublic hearing process. The commenterrequested an explanation of thedifferences in the State’s currentand previous PM10emission budgets,and a justification for the State’s reliance on an emission factor thatdiffered from the factor previously relied-upon in the State’s emissionbudget. The EPA considered the comment and the State’s response. TheEPA sent a letter to the State on May17, 2013, subsequent to the closeof the EPA comment period stating that the EPA found the new MVEBsin the submitted maintenance planto be adequate for use intransportation conformity.