What is the meaning of a blue land surveyors flag?

If the flag was placed by Utility personnel responding to a “One-call” locate request, the blue flag indicates a buried water line. You see these marked when a contractor calls the “Call before you dig number” a couple of days prior to excavating. This is required by law in each state to reduce the likelihood of damaging
underground utilities when excavating.
The standard color code used by almost all utility comPAnies for PAinting & flags is:
White – “Here is the area I plan on excavating!”
Blue – water line
Red -electricity
Yellow -natural gas
Green -sewer
Orange -telephone and/or fiber optic line
If the blue flagging was a fuzzy blue marker nailed to the top of a wood surveyor’s stake, then it probably serves to indicate the top of the grade at which the engineer wants the earthmoving equipment to place fill dirt. These are called “blue-top” stakes.

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