Anchorage CO Limited Maintenance Plan A plan addressing the second 10 years of the 2004 -2024 CO maintenance planning period Department of Health and Human Services Municipality of Anchorage October 2012 Anchorage CO Plan Update

Section 175A of the Clean Air Act requires the submission of a maintenance plan revision midway through the twenty year maintenance planning period. Anchorage’s twenty year CO Maintenance planning period runs from July 23, 2004 through July 22, 2024. The Anchorage revision must address second ten years (July 2014 – July 2024) The draft Anchorage CO Maintenance Plan revision was prepared using the limited maintenance plan (LMP) option. Anchorage CO Plan Update

What the heck is a “limited maintenance plan”? Anchorage CO Plan Update

EPA offers LMP option to areas where the design value is 85% or less of the CO standard. CO NAAQS = 9 ppm (as 8-hr average) 85% of CO NAAQS = 7.65 ppm Anchorage DV (2011) = 6.0 ppm Preparation of the CO maintenance plan revision under the LMP option is simpler and less rigorous than a full maintenance plan revision. Once EPA approves an LMP, regional air quality conformity procedures are greatly simplified. Anchorage CO Plan Update

The Anchorage CO LMP was prepared in accordance with EPA guidance contained in the “Paise memo” drafted in 1995. This guidance discusses how the five core provisions of an LMP should be addressed: attainment inventory maintenance demonstration monitoring to verify continued attainment of the CO NAAQS a contingency plan conformity determination requirements under an LMP. Anchorage CO Plan Update

Attainment inventory Sources of CO Emissions in Anchorage Bowl (2007) Source Category CO Emitted (tons per day) % of total Motor vehicle – running emissions 40.5 25.4% Motor vehicle – start emissions 84.8 53.4% Motor vehicle – extended idling by combination long-haul trucks 0.3 0.1% Subtotal – Motor Vehicles 125.6 78.9% Ted Stevens Anchorage International Airport Operations 12.4 7.8% Merrill Field Airport Operations 0.7 0.4% Wood burning – fireplaces and wood stoves 6.2 3.9% Space heating – natural gas 3.8 2.4% Miscellaneous (railroad, marine, snowmobiles, snow removal, portable electrical generators, welding, etc.) 9.3 5.8% Point sources (power generation, sewage sludge incineration) 1.3 0.8% Subtotal – Other Sources 33.7 21.1% TOTAL – ALL SOURCES 159.3 100% Anchorage CO Plan Update

Highest 2nd Max 8-hr Concentration Measured Maintenance Demonstration The update must show that the DV in Anchorage qualifies for the LMP option Highest 2nd Max 8-hr Concentration Measured in Preceding Two-Years (all values in ppm) Garden Seward Hwy Turnagain DHHS DVPaise 2002 5.7 5.2 7.7 2003 5.4 6.7 2004 6.4 5.5 7.9 2005 2006 4.8 6.1 2007 4.3 2008 3.8 3.1 2009 4.4 5.8 3.6 2010 6.0 2011 2.8 DV has been ≤ 7.65 ppm since 2006. Anchorage CO Plan Update

Air quality public awareness program The update continues the commitment to implement the primary control measures currently included in the maintenance plan: Air quality public awareness program Transit marketing Carpooling and Vanpooling Anchorage CO Plan Update

Monitoring to verify continued attainment of the CO NAAQS The update commits Anchorage and/or State of Alaska to continued monitoring to verify compliance with the CO standard The current CO network includes four sites. The highest concentrations are measured at the Turnagain site in residential Spenard. Anchorage CO Plan Update

Contingency plan The previous plan included a commitment to implement at least one of six contingency measures if a future violation of the CO standard occurs. The update affirms this commitment. Menu of Contingency Measures Increasing public awareness, transit marketing and carpool/vanpool efforts Curtailing or limiting the use of fireplaces and woodstoves when high CO is predicted Offering reduced fares or free transit for employees of companies that contribute to transit subsidies Reinstating the engine block heater installation subsidy Reinstating the ethanol blended gasoline requirement Reinstating the I/M Program Anchorage CO Plan Update

Conformity determinations under an LMP A motor vehicle emission budget is not required in an LMP. EPA guidance states that “emissions budgets in limited maintenance plan areas may be treated as essentially not constraining.” The EPA has concluded that for transportation purposes, the emissions in a qualifying LMP area need not be capped for the maintenance period and thus no emissions budget is required in the maintenance plan. Anchorage CO Plan Update

Tentative Approval Schedule AMATS TAC release of draft CO LMP for 30-day public review Sept 13, 2012 AMATS AQ Committee review and recommendation Oct 2, 2012 AMATS TAC recommendation on CO LMP Oct 11, 2012 AMATS Policy Committee review/approval of CO LMP Oct 25, 2012 Anchorage Assembly considers CO LMP for adoption Nov 13, 2012 ADEC public review process Dec 2012 – Jan 2013 ADEC legal review, adoption of CO LMP as a revision to the SIP Feb 2013 – May 2013 ADEC submits SIP revision to EPA for approval Jun 2013 EPA adequacy review of new conformity procedure (up to 90 days) Jun 2013 – Aug 2013 Anchorage CO Plan Update