(a) Sample retention requirements. Beginning January 1, 2017, any producer or importer of oxygenate shall do all the following:

(1) Retain a representative portion of each sample analyzed under §80.1642(b), of at least 330 milliliters in volume.

(2) Retain a representative sample of each batch of DFE for which the DEF producer or importer used the alternative means of determining the sulfur contents of the DFE batch pursuant to the requirements of §80.1642(c), of at least 330 milliliters in volume.

(3) 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.

(4) Comply with the DFE sample handling and storage procedures under §80.1642 for each sample portion retained.

(5) Comply with any request by EPA to—

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

(ii) 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 §80.1642 or the calculated sulfur content of the batch from which the sample was drawn determined pursuant to the requirements of §80.1611(e).

(b) [Reserved]