In making its decision, the Board of Supervisors shall consider (a) the proposed amendments, plans, and explanatory materials submitted by the applicant; (b) the impact of the proposal on roads, sewer facilities, water supplies, schools, and other public service facilities; (c) the impact of the proposal on regional housing needs and the effectiveness of the proposal in providing housing units of a type actually available to and affordable by classes of persons otherwise unlawfully excluded by the challenged provisions; (d) the suitability of the site for the intensity of use proposed (considering the site's soils, slopes, woodlands, wetlands, floodplains, aquifers, natural resources, and other natural features); (e) the impact of the proposed use on the site's soils, slopes, woodlands, wetlands, floodplains, natural resources; and (f) the impact of the proposal on the preservation of agriculture and other land uses which are essential to public health and welfare.