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 List of Reformulated Gasoline and Anti-Dumping Questions and Answers: July 1, 1994 through November 10, 1997 (pdf) (2.98 MB, July 2003)