Judgment denying a petition for writ of mandate to set aside approvals by defendant-county of a development project and the final environmental impact report (EIR) for the project, for failure to comply with the California Environmental Quality Act, is reversed with directions that defendant-county set aside its certification of the EIR, and prepare and circulate a supplemental EIR that addresses the errors involving: 1) recirculation for comment on possible mitigation measures that can protect the Frog; 2) the infeasibility of agricultural conservation easements and in-lieu fees; 3) discussion of cumulative impacts on farmland; and 4) mitigation measures for truck traffic.