ADA Ramp Surveys in Walnut Creek, CA

Walnut Creek concentrates its accessibility exposure in a small footprint. The downtown retail core around Broadway Plaza, the office blocks along North Main and Locust, and the structured parking that serves both create long, compound paths of travel: an accessible stall in a garage, a crossing of a drive aisle, a ramp or elevator lobby, a sidewalk, then an entrance threshold into a tenant space. Every one of those segments has its own slope, cross-slope, and landing requirement, and the failures that generate demand letters are usually in the transitions between them rather than in any single ramp. Out in the hillside neighborhoods above town, the problem is different: sidewalks running across grade in Lakewood, Saranap, and the ridge streets are where cross slope is hardest to hold, because the panel has to stay near level sideways while the street climbs. The City complies with Title II and has a designated ADA Coordinator, and its paving and roadwork projects add or reconstruct curb ramps as they go, which matters because federal guidance treats resurfacing as an alteration that triggers curb ramp upgrades in the work limits.

The measurement problem is that the tolerances are thin and the surfaces are not flat. A 2010 ADA Standards ramp run is 1:12 maximum, cross slope 1:48, and California Building Code Chapter 11B holds cross slope to 2 percent; accessible stalls and access aisles have to stay within 1:48 in all directions. A two-foot smart level on a warped concrete panel gives a different answer at every setup. We measure the ramp and the route as a surface instead: dense scan or total-station observation tied to survey control, so running slope is computed over the actual run, cross slope over the actual panel, and the stall over the whole stall.

Deliverables are slope and cross-slope exhibits, colorized slope maps over the route, spot elevations at landings and thresholds, and CAD a design team can build from. We document conditions; the compliance determination stays with your CASp or architect. See also Walnut Creek as-built surveys and Walnut Creek 3D scanning.