The 2 ppm downstream sulfur test tolerance (§ 80.580(d)) applies at all locations downstream of the refiner/importer beginning on October 15, 2008. Prior to that date, a 3 ppm test tolerance adjustment applies at these locations.
Question and Answer was originally posted at http://www.epa.gov/otaq/diesel/documents/420b06010.pdf
When does the 2 ppm tolerance apply?
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