At the time fixed for hearing and after receipt of the report of the appraisers, the commission shall examine said report, both for and against each claim for damages and compensation and shall determine the amount of damages and compensation due each claimant and may affirm, increase or diminish the amount awarded by the appraisers. After such action, the commission may thereupon adopt a final plan for the project, and proceed with its construction, or it may dismiss the entire proceedings.