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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.
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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
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.
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.
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.
Attainment inventorySources of CO Emissions in Anchorage Bowl (2007)
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) DV has been ≤ 7.65 ppm since 2006.
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
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.
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
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.
