How do you manage as-built surveys and documentation for a major construction project?

As-built management: establish survey control with redundancy, document monument locations. Schedule surveys at critical stages - foundation completion, structural frames, MEP rough-in, before cover-up. Capture specifications: positional accuracy +-10mm for critical elements, +-25mm for general. 3D scanning for complex areas. Data management: field codes standardize feature collection, daily upload to project server. Quality checks compare to design, identify deviations exceeding tolerance. Reporting format per contract requirements. Integration with BIM - point cloud to model comparison for deviation analysis. Final deliverables: georeferenced drawings, GIS database for asset management, deviation reports for design validation.