Maintenance Scheme for La Grande's PM-10 Particles Management
Oregon has taken significant steps to improve its air quality by implementing a plan to maintain compliance with the PM National Ambient Air Quality Standards (NAAQS). The plan, approved by the Environmental Protection Agency (EPA) on July 19, 2006, focuses on controlling residential wood combustion, fugitive dust, and industrial emissions.
The plan, outlined in OAR 340-204-0030, designates Nonattainment Areas in Oregon, with Union County, La Grande being designated as a moderate PM nonattainment area back in 1990 under the Clean Air Act Amendments.
The plan is divided into two phases. Phase I, triggered by PM-10 concentrations equal or exceeding 90% of the standard, requires an evaluation of the near-exceedance and a schedule for implementation of recommended strategies to prevent an exceedance or violation of the PM-10 standards. Phase II, triggered by a violation, requires the implementation of strategies identified in Phase I, as well as nonattainment permitting requirements for all new or modified major sources.
In addition to these regulations, the EPA has approved nonregulatory provisions and quasi-regulatory measures for Oregon SIP under 40 CFR part 52.1970(e). The plan also retains the requirement to obtain offsets for new and expanding major sources in the La Grande PM Maintenance Area.
However, the plan does not provide specific details about the offset requirements or the methods for controlling residential wood combustion, fugitive dust, and industrial emissions. It is worth noting that OAR 340-204-0040 designates Maintenance Areas in Oregon.
Oregon submitted this maintenance plan and redesignation request on October 25, 2005, and the EPA's approval was given on June 19, 2006. The implementation of this plan is aimed at ensuring that Oregon continues to meet the PM NAAQS, contributing to healthier and cleaner air for its residents.
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