|(a) Implementation of conditionally certified plans. Local governments are required to implement conditionally certified plans consistent with the Texas Natural Resources Code, Chapters 61 and 63, and the General Land Office rules for management of the beach/dune system, §§15.1 - 15.10 of this title (relating to Management of the Beach/Dune System). (b) Removal of conditions of certification. (1) Local governments shall submit their modified plans on or before the expiration of the 180-day time period. The General Land Office shall provide to the pertinent local government a determination as to the sufficiency of the modification(s) within 60 days of receipt of the plan. The General Land Office will remove all conditions of the plan's certification by amending the section in this subchapter that documents the status of the specific local government's plan. If the General Land Office determines that modifications of plans are insufficient, the General Land Office shall provide specific exceptions to the modifications. If those portions of the plan to which the General Land Office has noted exceptions can be addressed through further comment, plan revision and review, conditional certification will be reissued pursuant to a General Land Office amendment to the local government's section which documents the certification status of the local government's plan, subject to further plan modification. (2) In the event that a local government chooses not to modify its plan as requested in the General Land Office comments, the local government shall provide in writing the scientific or legal justification as to why such modifications are not feasible. The justification shall be submitted to the General Land Office on or before the due date of the revised plan. The justification will be reviewed by the General Land Office, and a determination as to the sufficiency of the justification will be provided to the local government within 60 days of receipt by the General Land Office. Local government plans shall continue in effect under conditional certification until the sufficiency of the justification is resolved or the section documenting the certification status of the local government plan is amended. (c) Withdrawal of conditional certification. Conditional certification of a local government plan shall be withdrawn by the General Land Office after the 180-day time period if the pertinent local government does not submit to the General Land Office either a formally adopted plan which has been modified consistent with General Land Office comments or the written scientific or legal justification as to why such modification is not feasible. In any event, withdrawal of conditional certification shall only occur after the General Land Office adopts an amendment withdrawing conditional certification to the section that documents the certification status of the local government plan, with accompanying specific reasons, and the General Land Office has given the pertinent local government written notice of the withdrawal of the conditional certification.