Topographic Surveys in El Sobrante, CA

El Sobrante is unincorporated Contra Costa County — there is no city hall, so building and grading permits run through the county's Department of Conservation and Development, and plan checkers there expect a competent site topographic map with hillside and creek-adjacent applications. The community's character works in your favor as a property owner and against you as a designer: semi-rural lots along San Pablo Dam Road are larger than their Richmond and San Pablo neighbors, some with horse facilities, long driveways, and hillside edges rising toward the San Pablo Reservoir watershed. Big, irregular terrain is precisely where a conventional topographic survey gets thin, because every shot costs field time. Our Trimble terrestrial laser scanner inverts that economics — millions of survey-grade points in one site visit — so a two-acre parcel gets the same surface density as a city lot.

Driveways are a recurring theme in our El Sobrante work. Long access drives climbing from San Pablo Dam Road to an upper building pad must meet county and fire-district grade and width standards, and proving a workable alignment requires a continuous, accurate profile — not a handful of shots at guessed grade breaks. From the point cloud we generate the full centerline profile and cross-slopes, and we produce a vegetation-filtered digital terrain model so the ground surface under brush and tree canopy is modeled correctly, which matters on parcels that have not been cleared in decades. Creek-adjacent lots get top-of-bank location and channel sections for county setback review, and older parcels with septic systems benefit from accurate slope mapping for dispersal-field siting.

Deliverables include one-foot contours, spot elevations, DWG/DXF base mapping, and the point cloud itself for your engineer. Records research for these parcels goes through the Contra Costa County Recorder and County Surveyor in Martinez, and where boundary questions ride along with the topography — common on older El Sobrante acreage — we resolve both in a single combined survey.