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Anchorage CO Maintenance Plan Revision

Anchorage CO Maintenance Plan Revision. Remove Commitment to I/M and Make it a “Local Option”. AMATS Technical Advisory Committee May 13, 2010. A little history…. In July 2008 the Anchorage Assembly overturned a decision by a previous Assembly and reinstated the I/M Program with some changes.

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Anchorage CO Maintenance Plan Revision

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  1. Anchorage CO Maintenance Plan Revision Remove Commitment to I/M and Make it a “Local Option” AMATS Technical Advisory Committee May 13, 2010

  2. A little history… • In July 2008 the Anchorage Assembly overturned a decision by a previous Assembly and reinstated the I/M Program with some changes. • They also directed DHHS to work with ADEC to remove I/M as a commitment in the State Implementation Plan and make it a “local option.”

  3. The first phase of CO Maintenance Plan revisions were approved by AMATS and the Assembly in May 2009.These revisions: • Extended new car I/M testing exemption four to six years. • Added transit marketing as a primary CO control measure along with I/M, air quality public awareness, and the carpool / vanpool program. • Clarified timelines for implementing contingency measures in the event of a future violation of the CO standard.

  4. Now we’ve moved on to Phase 2 of the revisions

  5. Phase 2 revisions are limited in scope • Delete I/M as primary measure and make it a local option. • Include new air quality / CO emission projections that assume that I/M program will be terminated in 2011. • Add I/M to menu of contingency measures to be considered for implementation if Anchorage violates CO standard in the future.

  6. As a local option, decisions regarding I/M become a local Assembly decision not subject to the lengthy approval process of EPA.

  7. How does the assumed termination of I/M in 2011 affect prospects for continued compliance with CO standard?

  8. Terminating I/M slightly increases the probability of an air quality violation in the next ten years • The estimated cumulative probability of violating the standard between 2011 and 2020 increases from about 1.4% with I/M to about 5% without. • The probability of violating gets progressively smaller over time because CO emissions are projected to decline.

  9. Clean Air Act requires I/M to be included in the menu of contingency measures if it is deleted as a primary measure.

  10. Added as new contingencymeasure

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