Oregon Revised Statutes Public Health and Safety § 466.505

(1) “PCB” means the class of chlorinated biphenyl, terphenyl, higher polyphenyl, or mixtures of these compounds, produced by replacing two or more hydrogen atoms on the biphenyl, terphenyl, or higher polyphenyl molecule with chlorine atoms. “PCB” does not include chlorinated biphenyls, terphenyls, higher polyphenyls, or mixtures of these compounds, that have functional groups attached other than chlorine unless that functional group on the chlorinated biphenyls, terphenyls, higher polyphenyls, or mixtures thereof of these compounds, is determined to be dangerous to the public health under ORS 466.525.

(2) “Ppm” means parts per million.