(a) Compliance with sulfur, cetane, and aromatics standards, dye and marker requirements. Compliance with the standards, dye, and marker requirements in §§80.510, 80.511, 80.520, and 80.521 shall be determined based on the level of the applicable component or parameter, using the sampling methodologies specified in §80.330(b), as applicable, and an approved testing methodology under the provisions of §§80.580 through 80.586 for sulfur; §80.2(w) for cetane index; §80.2(z) for aromatic content; and §80.582 for fuel marker. Any evidence or information, including the exclusive use of such evidence or information, may be used to establish the level of the applicable component or parameter in the diesel fuel or additive, or motor oil to be used in diesel fuel, if the evidence or information is relevant to whether that level would have been in compliance with the standard if the regulatory sampling and testing methodology had been correctly performed. Such evidence may be obtained from any source or location and may include, but is not limited to, test results using methods other than the compliance methods in this paragraph (a), business records, and commercial documents.

(b) Compliance with other requirements. Determination of compliance with the requirements and prohibitions of this subpart other than the standards described in paragraph (a) of this section and in §§80.510, 80.511, 80.520, and 80.521, and determination of liability for any violation of this subpart, may be based on information obtained from any source or location. Such information may include, but is not limited to, business records and commercial documents.

[69 FR 39204, June 29, 2004]