29 CFR § 1953.5 - Special provisions for standards changes.
(1) Where a Federal program change is a new permanent standard, or a more stringent amendment to an existing permanent standard, the State shall promulgate a State standard adopting such new Federal standard, or more stringent amendment to an existing Federal standard, or an at least as effective equivalent thereof, within six months of the date of promulgation of the new Federal standard or more stringent amendment. The State may demonstrate that a standard change is not necessary because the State standard is already the same as or at least as effective as the Federal standard change. In order to avoid delays in worker protection, the effective date of the State standard and any of its delayed provisions must be the date of State promulgation or the Federal effective date whichever is later. The Assistant Secretary may permit a longer time period if the State makes a timely demonstration that good cause exists for extending the time limitation. State permanent standards adopted in response to a new or revised Federal standard shall be submitted as a State plan supplement within 60 days of State promulgation in accordance with § 1953.4(b), Federal Program changes.
(2) Because a State may include standards and standards provisions in addition to Federal standards within an issue covered by an approved plan, it would generally be unnecessary for a State to revoke a standard when the comparable Federal standard is revoked or made less stringent. If the State does not adopt the Federal action, it need only provide notification of its intent to retain the existing State standard to OSHA within 6 months of the Federal promulgation date. If the State adopts a change to its standard parallel to the Federal action, it shall submit the appropriate documentation as provided in §§ 1953.4(b)(3) or (4) - Federal program changes. However, in the case of standards applicable to products used or distributed in interstate commerce where section 18(c)(2) of the Act imposes certain restrictions on State plan authority, the modification, revision, or revocation of the Federal standard may necessitate the modification, revision, or revocation of the comparable State standard unless the State standard is required by compelling local conditions and does not unduly burden interstate commerce.
(3) Where a State on its own initiative adopts a permanent State standard for which there is no Federal parallel, the State shall submit it within 60 days of State promulgation in accordance with § 1953.4(d) - State-initiated changes,
(b)Emergency temporary standards.
(1) Immediately upon publication of an emergency temporary standard in the Federal Register, OSHA shall advise the States of the standard and that a Federal program change supplement shall be required. This notification must also provide that the State has 30 days after the date of promulgation of the Federal standard to adopt a State emergency temporary standard if the State plan covers that issue. The State may demonstrate that promulgation of an emergency temporary standard is not necessary because the State standard is already the same as or at least as effective as the Federal standard change. The State standard must remain in effect for the duration of the Federal emergency temporary standard which may not exceed six (6) months.
(2) Within 15 days after receipt of the notice of a Federal emergency temporary standard, the State shall advise OSHA of the action it will take. State standards shall be submitted in accordance with the applicable procedures in § 1953.4(b) - Federal Program Changes, except that the required documentation or plan supplement must be submitted within 5 days of State promulgation.
(3) If for any reason, a State on its own initiative adopts a State emergency temporary standard, it shall be submitted as a plan supplement in accordance with § 1953.4(c), but within 10 days of promulgation.