For a refiner of blending stock to include in its compliance calculations the oxygenate used in blending conventional gasoline where the downstream blending was conducted by a person other than the refiner, § 80.101(d)(4)(ii)(B)(2) requires (among other things), that the refiner conduct "periodic sampling and testing of the gasoline produced subsequent to oxygenate blending."
The frequency and test methods are not specified in the regulations. However, for any quality assurance testing program under the RFG and anti-dumping regulations, if test methods other than the regulatory test methods are used, adequate correlation to the regulatory test methods must be demonstrated. The frequency of testing under any quality assurance program will depend upon the nature of the specific operation, taking into account all factors, such as prior testing results and opportunity for violations to occur. For further discussion of the what constitutes adequate periodic sampling and testing for a quality assurance program, see Question 11, VII.B., of the July 1, 1994 Question and Answer document.(10/17/94)
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)