The county board is authorized to make or cause to be made such investigations, surveys, studies, reports and reviews as in its judgment are necessary and desirable to determine the feasibility and desirability of the hospital facilities, the extent to which the hospital facilities will contribute to the health and welfare of the area in which they will be located, the powers, experience, background, financial condition, record of service and capability of the management of the hospital agency or public agency involved, the extent to which the hospital facilities otherwise conform to the criteria and requirements of this article, and such other factors as may be deemed relevant or convenient in carrying out the purposes of this article.