Jim, Looks like you were off a tenth, so no doubt they HAD to set it in the correct location! That kind of thing gets under my skin.
The funniest one I ever saw was two capped iron pins that were almost touching on the edge. Looked at the caps, and they were the same surveyor! This guy is in Alabama, and has a good reputation with the public. I've found three or four others that he pincushioned himself, but none that close. I don't think he keeps very good records. I don't see how his help/rodman kept from seeing the pins that were touching.
> ... but I'm wondering why the field crew felt it necessary to set the nail and shiner on top of my rebar and cap.
Obviously they couldn't set a rebar, it would have disturbed your monument. They were being respectful. :'(
Once I found a section corner, with 3 mons, one was 0.35' from the others, and two were about 0.12' apart. All were by the same surveyor. Turns out, that they were REPLACING the "Missing" monument. It was extremely hard ground, and they were pounding the magnetism out, by hard driving it. And, were probably replacing it from witness trees, with no nails in them, for a specific measure point, on the tree. It is not well known enough, that when you pound them hard, then touch the top with a magnet, and they will ZING for the next metal detector that comes along. Once I did a survey, and was setting a mon. Checked with Mr Shonestedt, and he said nothing was there. I dug down 6", and there was one there already. It had just been pounded hard.
I magnetized it, with a magnet, and yielded to the found mon.
Nate
Permanent magnetism can increase the response, but iron usually distorts the earth's magnetic field enough that the magnetic locator can find a vertical rod at some reasonable depth, even without a permanent magnetic field of its own.
Just another Technician (number cruncher) with a license.
At the above section corner, I could get no signal, except as much as a little furniture tack would give.
After digging, I found all three.
I think they went out with pin finder, and found no signal, and reset it with the witness trees. Twice. Assuming that the farmer had pulled the pin.
The ground was hard.
N
If there is no LS # and (and if you are a recording state), then can that even be considered a survey marker? Perhaps it was an errant child that obscured your carefully set (and quite permanent) mark with something destined to disappear?