So I'm reading through the specimen notes in the 2009 manual - on Page 429....
what do you think? Anyone ever see one in real life?
page 429 from here? http://cfeds.org/docs/sml/ManualOfSurveyingInstructions2009_060414.pdf
I have never seen real life notes like that
"identified by magnetic location, and presumably monumented with Kiebert's 1984 railroad spike, as described by Weatherly in 1986, at a presently undetermined depth below the asphalt surface of Glengary Bay Road. (The monument was not exposed for practical reasons related to county road maintenance.)"
Truth in coding. I am sure that other evidence such as measure to other marks and prior records that was evaluated to support the word "presumably".
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I have seen the reference "set iron rod at found location of residual rust remains".
:8ball:
nope!! never seen that one before
I've never seen that in actual BLM notes and hope I never do. I've seen too many instances of random metallic junk having been buried in the subgrade, mixed in with the AC, or sandwiched between overlays to ever trust a magnetic signal. I've even seen one location where Caltrans had set a control mon on an overpass approach - a 3" cap - and set 4 #5 rebar around it, with the tops of the rebar being a few hundredths higher than the cap and bent toward the cap. They had actually filed an RS and described the cap and the rebar "guard stakes". There was a later filed RS where the surveyor said there was no evidence of the original mon as described by Caltrans, but that they had found and accepted a 5/8" rebar set by persons unknown to perpetuate the position.
We showed up, got a heck of a magnetic reading that wouldn't localize very well. We scraped out a couple of years worth of accumulated road crud and found the top of a bent rebar in a divot in the AC. Chipped out about an 8" circle at the edge of the overlay. Found 3 more rebar in an approximate circular pattern with the tops all bent toward the center of the pattern about 0.1' down, and a 3" cap another tenth or two down.
Heck, if Penry can use a backhoe to dig a crater big enough to lose a Smart Car in to find corners, the rest of us ought to at least be willing to chip out enough AC to reach an arm through and dig as deep as our arms will reach.
If the county is worried about it's road surface, they shouldn't have paved over the monument or should have placed a mon well over it the last time they did an overlay.