A saw cut is the one place a slab has no cover over its steel. The concrete on top of the mesh or the bar is what keeps the salt in the air from reaching it, and a blade goes straight through that cover and leaves the steel bare on the face of the cut. Left open, that face rusts, the rust swells and the concrete beside the cut spalls off within a few winters of sea air. So no cut here is left as it was sawn. It is closed, coated or poured against before the crew leaves.
Scott Ferreira lays out every cut himself, after 19 years of opening slabs along the Orange County coast, and the jobs that bring the saw out are the ones this city is built of. A pool deck from the 1970s opened at the skimmer line, a garage floor trenched for a bathroom in a conversion off Warner, a driveway approach cut at the curb to widen it for a boat, or one broken panel taken out of a drive that is otherwise sound.
The slab is scanned for steel, conduit and pipe before the line is chalked, the blade runs wet and the slurry is vacuumed at the cut rather than hosed to the gutter, since every gutter here drains to the beach or the wetlands. Work at the curb is an encroachment permit from Public Works, held under a CSLB C-8 license with liability insurance on every job. Every cut and the pour that closes it carry a written workmanship guarantee against defects in how it was built.