All flood control maintenance and comprehensive flood control management planning (CFCMP) projects subject to the provisions of this rule must be conducted in accordance with the plans, specifications, and conditions approved by ecology. Any contemplated changes during construction or planning process that are significant deviations from conditions of the approved agreement, must first be submitted to ecology for approval. Any changes to the total cost of the project following execution of the written agreement must be submitted to ecology for approval before the construction or the completion of the plan.