Background

Portions of Power-Bannock Counties (Pocatello) in Idaho were designated a moderate nonattainment area for PM₁₀ by operation of law upon enactment of the Clean Air Act Amendments of 1990.

On November 5, 1998, EPA granted a request by the State to divide the Power-Bannock counties nonattainment area, which included a portion of the Fort Hall Indian Reservation, into two nonattainment areas; one which included only Reservation lands (Fort Hall nonattainment area) and a second (Portneuf Valley area) under the regulatory jurisdiction of the State.

On June 30, 2004, the State of Idaho submitted a plan that meets the planning obligations for both the nonattainment and maintenance plan. In addition, the State requested redesignation of the Portneuf Valley to attainment for PM₁₀. On May 20, 2005, EPA proposed in the Federal Register to approve the plan and grant the redesignation request. On July 13, 2006, EPA approved the plan and granted the redesignation request. (See 71 FR 39574 (PDF)(6 pp, 161 K,About PDF))

On April 21, 2014, the EPA received Idaho’s SIP revision adjusting the motor vehicle emissions budget in the maintenance plan. On July 17, 2014 the EPA published a direct final rule approving the MVEB. (See 79 FR 41647 (PDF)(3 pp, 240 K)).

Summary

The plan relies on control measures on point and area sources to attain and maintain the National Ambient Air Quality Standards for PM₁₀, primarily measures for control of emissions from residential wood combustion, residential road dust, and the industrial source, J.R. Simplot. 

Rules

• City of Pocatello, Residential Wood Combustion Curtailment Ordinance, #2450, January 12, 1994
• City of Pocatello, Revised Air Quality Curtailment Levels Ordinance, #2726, September 18, 2003
• City of Chubbuck, Residential Wood Combustion Curtailment Ordinance, #403, November 23, 1993
• City of Chubbuck, Revised Air Quality Curtailment Levels Ordinance, #582, December 9, 2003

Permits

• Permit # T1-9507-114-1; Facility # 077-00006, J.R. Simpolt Co. April 5, 2004 
• Compliance Agreement and Voluntary Order, Idaho Code 39-116A, J.R. Simpolt Co, April 16, 2004 

EPA Effective Date

August 14, 2006