Beginning January 1, 2017, or on the first day that any producer or importer of ethanol denaturant designates a batch of certified ethanol denaturant, whichever is earlier, the ethanol denaturant producer or importer shall do all the following:

(a) Retain a representative portion of each sample collected under §80.1644, of at least 330 milliliters in volume.

(b) Retain sample portions for the most recent 20 samples collected, or for each sample collected during the most recent 21 day period, whichever is greater, not to exceed 90 days for any given sample.

(c) Comply with the ethanol denaturant sample handling and storage procedures under §80.1644 for each sample portion retained.

(d) Comply with any request by EPA to—

(1) Provide a retained sample portion to the Administrator's authorized representative; and

(2) Ship a retained sample portion to EPA, within two working days of the date of the request, by an overnight shipping service or comparable means, to the address and following procedures specified by EPA, and accompanied with the sulfur test result for the sample determined under §80.1644.

[79 FR 23655, Apr. 28, 2014, as amended at 80 FR 9100, Feb. 19, 2015]