Section 451 - EMISSION OF AIR CONTAMINANT - VISUAL STANDARD451.1 No person shall cause or permit the emission, for any period aggregating more than 3 minutes in any 1 hour, of an air contaminant from any source which, at the point of emission, or within a reasonable distance of the point of emission, exceeds 20% opacity except as follows:451.11 When the owner or operator of a source supplies valid data to show that the opacity is in excess of 20% as a result of the presence of condensed water droplets, and that the concentration of the particulate matter, as shown by a source test approved by the Control Officer, is less than 0.10 grain/dscf (0.23 g/m3).451.12 Excess emissions as a result of soot blowing or grate cleaning shall not occur for more than fifteen minutes in any eight hour period or another schedule approved by the Control Officer provided that the owner or operator can demonstrate to the satisfaction of the Control Officer that the time limitations of this subsection are not being exceeded. Wash. Admin. Code Northwest Clean Air Agency, 400, 451
AMENDED: April 14, 1993, October 13, 1994, May 11, 1995, November 8, 2007