OAR 340-208-0610: Clackamas, Columbia, Multnomah, and Washington Counties: Particulate Matter Weight Standards

Except for equipment burning natural gas and liquefied petroleum gas, the maximum allowable emission of particulate matter from any fuel burning equipment: (1) Is a function of maximum heat input as determined from Figure 1, except that from: (a) Existing fuel burning equipment installed, constructed or last modified on or before June 1, 1970, utilizing wood residue, it is 0.20 grain per standard cubic foot of exhaust, corrected to 12 percent carbon dioxide; and (b) New fuel burning equipment installed, constructed, or modified after June 1, 1970 utilizing wood residue, it is 0.10 grain per standard cubic foot of exhaust gas, corrected to 12 percent carbon dioxide; and (2) Must not exceed Smoke Spot #2 for distillate fuel and #4 for residual fuel, measured by ASTM D2156-65, “Standard Method for Test for Smoke Density of the Flue Gases from Distillate Fuels.” [NOTE: View a PDF of Figure by clicking on "Tables" link below.] [NOTE: Publications referenced are available from the agency.] [ED. NOTE: To view attachments referenced in rule text, click here to view rule.]