The proposed waiver would have a specific, adverse impact upon the public health or safety, and there is no feasible method to satisfactorily mitigate or avoid the specific adverse impact without rendering the housing development unaffordable to low- and moderate-income households. For the purpose of this subsection, "specific, adverse impact" means a significant, quantifiable, direct and unavoidable impact, based on objective, identified, written public health or safety standards, policies, or conditions as they existed on the date that the application for the housing development was deemed complete as defined in Government Code Section 65589.5.