At any time after receiving the engineer’s report required by section 40-22-10, the governing body may direct the engineer to prepare detailed plans and specifications for construction of the improvement. The plans and specifications shall be approved by a resolution of the governing body of the municipality. If the plans and specifications include the establishment of the grade of a street and such grade has not been established previously by ordinance, the resolution approving the plans, specifications, and estimates shall constitute an establishment of the grade.