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Water Table?


mapjunkie

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I have noticed in the description of a couple vertical control marks that the disk is set in the"water table" of a building. Now I know where I would expect to find the disk, but I'm curious about the terminology - is this an archaic term or does it describe a particular feature of a construction technique? I've only seen it on marks set on government buildings (so far). (see LF0490 , which I intend to collect this weekend)

 

-Matt

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