199. For the purposes of this Regulation, an emission limit or other emission standard established for a source of contamination is complied with if
(1) the arithmetic average of 3 results of measures taken during the same sampling run carried out is less than or equal to the limit or standard;
(2) at least 2 of the results are less than the limit or standard; and
(3) none of the 3 results exceeds the limit or standard by not more than 20%.
This section does not apply to emission limits and other emission standards for which a provision of this Regulation prescribes a contaminant sampling taken by a continuous measuring and recording system, or to the limits prescribed by section 137 for fluorides. It also does not apply to the limits prescribed by Title IV.