40 CFR § 279.65 - Tracking.
(a) Acceptance. Used oil burners must keep a record of each used oil shipment accepted for burning. These records may take the form of a log, invoice, manifest, bill of lading, or other shipping documents. Records for each shipment must include the following information:
(5) The quantity of used oil accepted; and
(6) The date of acceptance.
(b) Record retention. The records described in paragraph (a) of this section must be maintained for at least three years.