29 C.F.R. § 2570.44

(a) An applicant may withdraw his application for an exemption at any time by informing the Department, either orally or in writing, of his intent to withdraw.

(b) Upon receiving an applicant's notice of intent to withdraw an application for an individual exemption, the Department will confirm by letter the applicant's withdrawal of the application and will terminate all proceedings relating to the application. If a notice of proposed exemption has been published in the Federal Register, the Department will publish a notice withdrawing the proposed exemption.

(c) Upon receiving an applicant's notice of intent to withdraw an application for a class exemption or for an individual exemption that is being considered with other applications as a request for a class exemption, the Department will inform any other applicants for the exemption of the withdrawal. The Department will continue to process other applications for the same exemption. If all applicants for a particular class exemption withdraw their applications, the Department may either terminate all proceedings relating to the exemption or propose the exemption on its own motion.

(d) If, following the withdrawal of an exemption application, an applicant decides to reapply for the same exemption, he may submit a letter to the Department requesting that the application be reinstated and referring to the application number assigned to the original application. If, at the time the original application was withdrawn, any additional information to be submitted to the Department under § 2570.39 of these procedures was outstanding, that information must accompany the letter requesting reinstatement of the application. However, the applicant need not resubmit information previously furnished to the Department in connection with a withdrawn application unless reinstatement of the application is requested more than two years after the date of its withdrawal.

(e) Any request for reinstatement of a withdrawn application submitted in accordance with paragraph (d) of this section, will be granted by the Department, and the Department will take whatever steps remained at the time the application was withdrawn to process the application.