40 CFR § 63.9510
By what date must I conduct my initial compliance demonstration?
June 9, 2020
(a) If you use a solvent recovery system and/or solvent substitution, you must conduct your initial compliance demonstration within 7 calendar days after the compliance date that is specified for your source in §63.9495.
(b) If you use a control technique other than a solvent recovery system and/or solvent substitution, you must comply with the provisions in §63.9570.