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Conformity Adequacy Review: Region 10

State Implementation Plans (SIP) Submissions that EPA has Found Adequate or Inadequate
Region 10: Alaska, Idaho, Oregon, and Washington

For more information about adequacy review, return to the main adequacy page.  

This page provides a list of state implementation plans that include motor vehicle emission budgets that EPA Region 10 has found either adequate or inadequate for the purposes of transportation conformity.

Contact:  Karl Pepple, (AK, ID, OR, WA) U.S. EPA Region 10, 1200 Sixth Ave., Seattle, WA  98101; phone: 206-553-1778. email: pepple.karl@epa.gov.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.

Alaska
Area Pollutant SIP Submission Finding (date budgets apply) Additional Information/ Comments
Anchorage carbon monoxide maintenance plan Adequate (2/29/2012)
Letter
FR Notice (PDF)(2 pp, 147 K, published February 14, 2012, About PDF)
Budgets found adequate through the adequacy review process.
Adequate (6/23/2004)
FR Notice
SIP found adequate through SIP approval process.
attainment demonstration Adequate (9/18/2002)
FR Notice
Budgets adequate by virtue of SIP approval.
Inadequate (5/14/1999) Determination made under old process.
Eagle River PM10 limited maintenance plan Adequate (5/14/2012)
Letter
FR Notice (PDF)(2 pp, 194 K, published April 27, 2012, About PDF)
Budgets found adequate through the adequacy review process.
Fairbanks carbon monoxide maintenance plan Adequate (9/27/2004)
FR Notice
Budgets adequate by virtue of SIP approval.
attainment demonstration Adequate (4/5/2002)
FR Notice
Budgets found adequate through SIP approval process.
Inadequate (5/14/1999) Determination made under old process
Idaho
Area Pollutant SIP Submission Finding (date budgets apply) Additional Information/ Comments
Northern Ada County PM10 second limited maintenance plan Adequate (6/21/2013)
FR Notice
Letter
Budgets found adequate through adequacy review process.
carbon monoxide limited maintenance plan Adequate (12/27/2002)
FR Notice
Budgets found adequate through SIP approval process.
Pocatello PM10 maintenance plan Adequate (10/4/2004)
Letter
FR Notice
Budgets found adequate through adequacy review process.
attainment demonstration Inadequate (8/14/2000)
Letter
FR Notice
 
Oregon
Area Pollutant SIP Submission Finding (date budgets apply) Additional Information/ Comments
Grants Pass CO limited maintenance plan Adequate (9/28/2015)
80 FR 44864 (7/28/2015)
Budgets found adequate through the SIP approval process.
PM10 limited maintenance plan Adequate (9/28/2015)
80 FR 45431 (7/30/2015)
Budgets found adequate through the SIP approval process.
Klamath Falls 2006 PM2.5 attainment plan Adequate (8/17/2015)
80 FR 45654 (7/31/2015)
Budgets found adequate through the adequacy review process.
Medford PM10 maintenance plan Adequate (8/18/2006)
FR Notice
Budgets found adequate through SIP approval process.
carbon monoxide second maintenance plan Adequate (5/13/2016)
Letter
80 FR 54788 (4/28/16)
Budgets found adequate through the adequacy review process.
maintenance plan Adequate (4/26/2002)
Letter
FR Notice
Budgets found adequate through adequacy review process.
Oakridge 2006 pm2.5 attainment plan

Adequate (6/21/2017)
FR Notice (Printed 6/6/2017)
Letter

Budgets found adequate through the adequacy review process
Portland carbon monoxide maintenance plan Adequate (1/24/2006)
FR Notice
Budgets found adequate through SIP approval process.
Salem carbon monoxide limited maintenance plan Adequate (3/02/2009)
FR Notice (PDF)(7 pp, 163 K, published December 30, 2008,  About PDF)
Budgets found adequate through SIP approval process.
Washington
Area Pollutant SIP Submission Finding (date budgets apply) Additional Information/ Comments
Kent, Seattle, and Tacoma PM10 Limited maintenance plan Adequate (8/20/2014)
79 FR 49239 (8/20/2014) 
Budgets found adequate through the SIP approval process.
Spokane PM10 limited maintenance plan Adequate (4/12/2016)
81 FR 21470 (4/12/2016)
Budgets found adequate through the SIP approval process.
Adequate (8/30/2005)
FR Notice
Budgets found adequate through SIP approval process.
carbon monoxide maintenance plan Adequate (8/29/2005)
FR Notice
Budgets found adequate through SIP approval process.
attainment demonstration Adequate (12/4/2002)
Letter
FR Notice
Budgets found adequate through adequacy review process.
Inadequate (5/14/1999) Determination made under old process
Tacoma-Pierce County 2006 PM2.5 maintenance plan Adequate (2/10/2015)
80 FR 7347 (2/10/2015)
Budgets found adequate through the SIP approval process.
Vancouver carbon monoxide limited maintenance plan Adequate (12/4/2007)
Letter
FR Notice
Budgets found adequate through adequacy review process.
Yakima PM10 limited maintenance plan Adequate (11/29/2004)
Letter
FR Notice
Budgets found adequate through adequacy review process.
carbon monoxide limited maintenance plan Adequate (12/31/2002)
FR Notice
Budgets found adequate through the SIP approval process.

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