OAR 340-240-0510: Klamath Falls Nonattainment Area: Opacity Standard

(1) Except as provided in section (2), no person conducting a commercial or industrial activity may cause or permit the emission of any air contaminant into the atmosphere from any stationary source including fuel or refuse burning equipment, that exhibits equal to or greater than 20% opacity as a six minute average. (2) Exceptions to section (1) include the following: (a) This rule does not apply to fugitive emissions. (b) For wood-fired boilers that were constructed or installed prior to June 1, 1970 and not modified since that time, visible emissions during grate cleaning operations must not equal or exceed 40% opacity as a six minute average except that: (A) Beginning June 30, 2013, this exception will only apply if the owner or operator conducts the grate cleaning in accordance with a grate cleaning plan that has been approved by DEQ; and (B) The owner or operator must prepare a grate cleaning plan in consultation with DEQ and submit the plan to DEQ by June 1, 2013. NOTE: This rule is included in the State of Oregon Clean Air Act Implementation Plan that EQC adopted under OAR 340-200-0040.