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§ 1090.1345 Retaining samples.
(a) Retain samples as follows:
(1) A fuel manufacturer, regulated blendstock producer, or independent surveyor must keep representative samples of gasoline, diesel fuel, or oxygenate that is subject to certification testing requirements under this subpart for at least 30 days after testing is complete, except that a longer sample retention of 90 days applies for a blending manufacturer that produces gasoline.
(2) A certified pentane producer must keep representative samples of certified pentane for at least 30 days after testing is complete.