and wherealterations, and it may apply to the prescriptive provisions of the san francisco building code. and for the projects with the prescriptive exemptions of the building code. and the discretion of the director of it may include one or more, structural engineering, geotechnical engineering, site specific seismic assessments, and scaling. the term geotechnical and seismic hazard engineering design review is referred to as a peer review. and it encompasses design review as required. if the director determines that the review is required they may request geotechnical or seismic hazard reviewers having knowledge and experience to provide professional opinions on the design aspects of a project. the purpose is to have an independent objective technical review of the aspects of the project design that are identified in the scope of the review. reviews contract with san francisco department of building inspections are responsible to the director. and they are responsible for the payment of fees and other expenses for professional services of the reviewers. and they shall sign all written