As-built surveys of anchor bolt placement are typically required for the proper placement of plates prior to steel erection. By using these surveys, corrections can be made in the alignment and vertical placement of columns. The survey is generally supplied to the construction company and the fabricator in two forms.
The simplest is in the form of a pdf drawing of each pattern. The survey will most often be delivered in a cad file format for better use in the now predominantly cad oriented production design