Yeah, I’m a registered civil engineer in California and there should only be ONE corner monument at a given corner. Make sure you are looking at a monument and not some tie in points. What I’ll do is use ONX for rough orientation and look for the corner monument near where my ONX shows the corner tip. The tricky thing is not to trespass looking for the corner monument, considering that tip is surrounded by private property! If I find any monument where the ONX shows the tip, I will call it good. That’s plenty good due diligence. I’m not going to get maps and records and actually verify the monument with records. I’m not going to build something on that monument. There should only be ONE corner monument at any given property corner.Being a land surveyor, i see a lot of opportunities for land surveyors, both private and government, to help everyone comply with the spirit of this ruling.
The case-by-case implementation of this ruling will be tricky, and I would caution non surveyors about deciding whether a corner monument is valid.
Bill