A revised civil set lands in the project folder. Someone opens the old set and the new set in a PDF viewer like Bluebeam, lines up the sheets, and starts squinting for differences. On C-301, grades shifted. On C-402, a storm line moved three feet, and a flatwork callout changed from a 6-inch slab to an 8-inch slab.
Each project manager runs this review differently. Some catch the material changes. Some catch annotation noise and miss the regrade. The comparison lives in one person's head and one set of markups nobody else can trace. A grade or utility change caught in the field costs demolition, re-fabrication, an RFI cycle, schedule slip, and usually a change order. The change was knowable. The detection failed.
