Beneath East Bay streets sits a network of survey monuments — brass disks, iron pipes, nails and tags — that anchors every property line in the neighborhood. Street paving, utility trenching, and grading destroy them routinely. California law has a specific answer for this, and it puts the obligation on the people doing the work.
What §8771 Actually Requires
Business & Professions Code §8771 requires that when survey monuments will be disturbed or destroyed by construction, they must first be referenced by a licensed land surveyor so they can be replaced afterward. The mechanism:
- Before construction, the surveyor locates each monument in the work zone and sets durable reference ties outside the disturbance area.
- A Corner Record (or Record of Survey where required) documenting those references is filed with the county surveyor.
- After construction, the monuments are reset from the references, and a post-construction Corner Record is filed documenting the replacement.
The result is an unbroken public record: anyone retracing boundaries in the future can recover the monument positions even though the physical markers were destroyed and replaced.
Who Is Liable When Monuments Are Destroyed?
The party performing the work. And the economics are lopsided:
- Preservation beforehand is a short field task: locate, tie, file. Modest, predictable cost.
- Restoration afterward — once the monument is gone with no references — requires a retracement survey rebuilding the position from surrounding evidence: record maps, adjoining monuments, occupation lines. Routinely several times the cost, and every affected boundary inherits uncertainty in the meantime.
This is why public agencies increasingly write §8771 compliance directly into capital-project specifications, and why cities condition encroachment and grading permits on proof of monument preservation. On public contracts, monument destruction without preservation can become a compliance problem with the funding agency, not just a survey bill.
What Triggers It
- Street paving, reconstruction, and pavement grinding — centerline monuments in wells are the classic casualty
- Utility trenching: sewer, water, gas, joint trench, fiber
- Grading and excavation near property corners
- Demolition, especially where corners sit at or near building lines
- Curb, gutter, and sidewalk replacement over offset monuments
In older East Bay grids — Oakland, Berkeley, Alameda, Albany — monumented intersections are dense, and a single paving project can cross dozens of them. In the hills, monuments are sparser, which cuts the other way: each one destroyed is harder and costlier to rebuild from remaining evidence.
What a Corner Record Is
A Corner Record is a standardized filing with the county surveyor documenting a monument's position, character, and the references tied to it — a lighter instrument than a Record of Survey, designed exactly for this workflow. Monument preservation uses them in pairs: one filed before construction documenting the references, one after documenting the reset monument. Alameda County and Contra Costa County each maintain these filings through their county surveyor's offices.
A Pre-Grading Checklist for Contractors
- Send the surveyor your work limits — records research identifies affected monuments before anyone visits the site.
- Get the pre-construction Corner Records filed before mobilizing equipment; some agencies want the filing proof with the permit package.
- Flag known monument locations on the ground for crews where practical.
- If an unexpected monument turns up mid-project — a pipe in a trench line, a disk under old pavement — stop and call the surveyor before removing it.
- Schedule the post-construction reset after final paving, not before, so the reset monuments survive.
Fast, Predictable, Off the Critical Path
Monument preservation is short-duration work that sits on the permit critical path — so we prioritize it. Send us your work limits and we will identify affected monuments from record data, quote the scope, and get the filings done before your deadline. Details on our monument preservation service.