OAR 340-226-0140: Highest and Best Practicable Treatment and Control: Additional Control Requirements for Stationary Sources of Air Contaminants

In addition to other applicable requirements, DEQ may establish control requirements by permit if necessary as specified in sections (1) through (5): (1) Requirements will be established to prevent violation of an ambient air quality standard caused or projected to be caused substantially by emissions from the source as determined by modeling, monitoring, or a combination thereof. Any air quality analysis must be conducted in accordance with the procedures in OAR chapter 340, division 225. For existing sources, DEQ may conduct monitoring or modeling or may require a source to conduct monitoring or modeling to determine whether the source’s emissions will cause or contribute to a new exceedance of an ambient air quality standard. (2) Requirements will be established to prevent significant impairment of visibility in Class I areas caused or projected to be caused substantially by a source as determined by modeling, monitoring, or a combination thereof. For existing sources, DEQ will conduct monitoring to confirm visibility impairment. (3) A requirement applicable to a major source will be established if it has been adopted by EPA but has not otherwise been adopted by the EQC. (4) An additional control requirement will be established if requested by the owner or operator of a source. (5) Requirements will be established if necessary to protect public health or welfare for the following air contaminants and sources not otherwise regulated under OAR chapter 340, divisions 200 through 268: (a) Chemical weapons; and (b) Combustion and degradation by-products of chemical weapons. [NOTE: This rule is included in the State of Oregon Clean Air Act Implementation Plan that EQC adopted under OAR 340-200-0040]