40 CFR 63.7191 - What records must I keep?
(a) You must keep the records listed in paragraphs (a)(1) through (3) of this section.
(1) A copy of each notification and report that you submitted to comply with this subpart, including all documentation supporting any Notification of Compliance Status and periodic report of compliance that you submitted, according to the requirements in § 63.10(b)(2)(xiv).
(b) For each CMS, you must keep the records listed in paragraphs (b)(1) through (5) of this section.
(1) Records described in § 63.10(b)(2)(vi) through (xi).
(2) All required measurements needed to demonstrate compliance with a relevant standard (e.g., 30-minute averages of CMS data, raw performance testing measurements, raw performance evaluation measurements).
(3) All required CMS measurements (including monitoring data recorded during unavoidable CMS breakdowns and out-of-control periods).