How do we handle results from two different labs (refinery and outside) which differ?

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Technical and engineering judgment must be used to develop an explanation for and/or solution to the discrepancy. This explanation/solution must be supported by the baseline auditor, and is subject to EPA review and approval.(7/1/94)

This question and answer was posted at Consolidated List of Reformulated Gasoline and Anti-Dumping Questions and Answers: July 1, 1994 through November 10, 1997 (PDF)(333 pp, 18.17 MB, EPA420-R-03-009, July 2003, About PDF)