After preparing a schedule of damages, the board of supervisors of a soil and water conservation district or its designee shall make an estimate of the cost of the proposed improvement. The estimate shall include all of the following:
(A) Actual construction costs, including costs of addressing the construction specifications set forth in section 940.24 of the Revised Code;
(B) The estimated costs included in the schedule of damages prepared under section 940.25 of the Revised Code;
(C) Any expenses incurred in investigations, consulting services, and notifications related to the proposed improvement, and any other incidental costs.