Yes. Although an independent lab may use a substitute lab for certain tasks, a refiner is required to name a single independent lab for each refinery. It is this independent lab with which EPA will communicate regarding the independent sampling and testing program, and who must submit all reports to EPA. A refiner that operates more than one refinery may, however, use the same independent lab for each refinery.(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)