The regulatory provision at § 80.69(e) applies to situations where RBOB is blended with oxygenate at a terminal other than in a terminal storage tank (which is addressed in § 80.69(c)). The requirements of § 80.69(e) would apply where RBOB and oxygenate are loaded onto a gasoline delivery truck at the same time.
This would be the case where the RBOB and oxygenate are loaded sequentially into a truck at the loading rack, as well as where RBOB and oxygenate are combined in a mixing header that is located between the RBOB storage tank and the truck loading rack. (8/29/95)
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)