(a) Compliance with the mass emission standards in Table 1 of this Part will be determined by stack testing in a manner acceptable to the commissioner. Method 5 as described in appendix A of part 60 of title 40 of the Code of Federal Regulations (see table 1, section 200.9 of this Title) shall be considered an acceptable method. The sampling rate shall be at least 0.9 dry standard cubic meters per hour (0.53 dry standard cubic feet per minute). The sampling for each run must continue for an integral number of cycles with a total duration of at least 60 minutes except where shorter sampling times, as necessitated by process variables or other factors, are approved by the commissioner. In order to obtain this approval, the source owner must make a written request describing the factors which make sampling for 60 minutes of operation impractical. This written request may be submitted with the testing notification required by Part 202 of this Title.

(b) For blast furnace tapping operations, sampling must be conducted during the blast furnace tapping period.

(c) For basic oxygen furnaces, sampling of the lancing and fluxing cycles must start at the beginning of the oxygen blow and must terminate at the end of the oxygen blow prior to tapping. Sampling of flue gases must be discontinued whenever oxygen lancing is terminated (such as when the vessel is outside of the main hood for temperature measurements and sampling) and must resume when oxygen lancing is reinitiated. The sampling cycle for tapping must start when the molten steel begins flowing into the ladle and must end when the molten steel flow stops.