29 C.F.R. § 2570.39

(a) An applicant may notify the Department of its intent to submit additional information supporting an exemption application either by telephone or by letter sent to the address furnished in the applicant's tentative denial letter, or electronically to the email address provided in the tentative denial letter. At the same time, the applicant should indicate generally the type of information that will be submitted.

(b) The additional information an applicant intends to provide in support of the application must be in writing and be received by the Department within 40 days from the date of the tentative denial letter. All such information must be accompanied by a declaration under penalty of perjury attesting to the truth and correctness of the information provided, which is dated and signed by a person qualified under § 2570.34(b)(5) of this subpart to sign such a declaration.

(c) If, for reasons beyond its control, an applicant is unable to submit all the additional information he or she intends to provide in support of his application within the 40-day period described in paragraph (b) of this section, he or she may request an extension of time to furnish the information. Such requests must be made before the expiration of the 40-day period and will be granted only in unusual circumstances and for a limited period as determined, respectively, by the Department in its sole discretion.

(d) If an applicant is unable to submit all of the additional information he or she intends to provide within the 40-day period specified in paragraph (b) of this section, or within any additional period granted pursuant to paragraph (c) of this section, the applicant may withdraw the exemption application before expiration of the applicable time period and reinstate it later pursuant to § 2570.44.

(e) The Department will issue, without further notice, a final denial letter denying the requested exemption pursuant to § 2570.41 where—