; or (2) until such date that the Secretary, under subsection (b)(1), approves or denies a request submitted by the establishment to operate at alternate inspection rates. (d) Duration of approved requests An establishment may continue to operate pursuant to the terms of a request approved under subsection (b)(1) so long as the establishment continues to meet the food safety criteria referred to in subsection (a)(1). (e) Noncompliance and revocation (1) Notice of noncompliance The Secretary shall provide— (A) in the case of an establishment operating pursuant to the terms of a request approved under subsection (b)(1) that fails to meet the food safety criteria referred to in subsection (a)(1), written notice to such establishment describing the nature of such failure; and (B) in the case of an establishment continuing operations under subsection (c) that fails to adhere to the requirements of such subsection, written notice to such establishment describing the nature of such failure. (2) Grace period; response to noncompliance Following the 180-day period beginning on the date on which an establishment receives a written notice of noncompliance under paragraph (1), if the Secretary determines the establishment has not remedied the failures described in such notice, the Secretary may— (A) at the discretion of the Secretary, provide the establishment an additional opportunity to remedy the failures described in such notice