Within 75 days after the initiation of an investigation, the administering authority shall cause an official designated for such purpose to review the information concerning the case received during the first 60 days of the investigation, and, if there appears to be sufficient information available upon which the preliminary determination can reasonably be based, to disclose to the petitioner and any interested party, then a party to the proceedings that requests such disclosure, all available nonconfidential information and all other information which is disclosed pursuant to section
1677f of this title. Within 3 days (not counting Saturdays, Sundays, or legal public holidays) after such disclosure, the petitioner and each party which is an interested party described in subparagraph (C), (D), (E), (F), or (G) of section
1677
(9) of this title to whom such disclosure was made may furnish to the administering authority an irrevocable written waiver of verification of the information received by the authority, and an agreement that it is willing to have a preliminary determination made on the basis of the record then available to the authority. If a timely waiver and agreement have been received from the petitioner and each party which is an interested party described in subparagraph (C), (D), (E), (F), or (G) of section
1677
(9) of this title to whom the disclosure was made, and the authority finds that sufficient information is then available upon which the preliminary determination can reasonably be based, a preliminary determination shall be made within 90 days after the initiation of the investigation on the basis of the record established during the first 60 days after the investigation was initiated.