(a) Emission testing, sampling and analytical determinations to ascertain compliance with this Subchapter shall be conducted in accordance with test methods acceptable to the department. The Reference Methods contained in 40 CFR part 51, appendix M, 40 CFR part 60, appendix A, 40 CFR part 61, appendix B, and 40 CFR part 63, appendix A (see Table 1, section 200.9 of this Title) and all future technical revisions, additions or corrections made thereto shall be considered as acceptable test methods for those sources and contaminants for which they are expressly applicable, except where the department has issued a specific method to be used instead of a Reference Method contained in these Federal regulations or where the department determines that one or more alternate methods are also acceptable. The person who owns or operates an air contamination source shall submit the emission test report in triplicate to the department within 60 days after the completion of tests. In the event such source owner/operator can demonstrate to the department such time is not sufficient, the source owner/operator may submit a request in writing and be granted an extension. Where an opacity emission standard is applicable to the source tested, the emission test report shall include the opacity observation.

(b) Alternative emission test methods or deviations from acceptable test methods may be acceptable to the department if the character of the test site or the emissions makes it impractical to utilize acceptable test methods or where no applicable test method is available. In such cases, the source owner/operator shall secure prior written acceptance by the department of any proposed alternative emission test method. Requests for such prior acceptance shall include justification for substituting the alternative emission test method.