(a) The owner or operator of a source subject to Sec. 63.362 shall comply with the recordkeeping requirements in Sec. 63.10(b) and (c), according to the applicability in Table 1 of Sec. 63.360, and in this section. All records required to be maintained by this subpart or a subpart referenced by this subpart shall be maintained in such a manner that they can be readily accessed and are suitable for inspection. The most recent 2 years of records shall be retained onsite or shall be accessible to an inspector while onsite. The records of the preceding 3 years, where required, may be retained offsite. Records may be maintained in hard copy or computer-readable form including, but not limited to, on paper, microfilm, computer, computer disk, magnetic tape, or microfiche.
(b) The owners or operators of a source using 1 to 10 tons not subject to Sec. 63.362 shall maintain records of ethylene oxide use on a 12-month rolling average basis (until the source changes its operations to become a source subject to Sec. 63.362).
(c) The owners or operators of a source using less than 1 ton shall maintain records of ethylene oxide use on a 12-month rolling average basis (until the source changes its operations to become a source subject to Sec. 63.362).
(d) The owners or operators complying with Sec. 63.363(b) (4) shall maintain records of the compliance test, data analysis, and if catalyst is replaced, proof of replacement. [66 FR 55585, Nov. 2, 2001]