A.P.W.A. Red -
For electric power lines, cables, conduit, and lighting cables.
A.P.W.A. Yellow -
For gas, oil, stream, petroleum, or gaseous materials.
A.P.W.A. Orange -
For telephone, communication, alarm, or signal cables or conduit.
A.P.W.A. Blue -
For water, irrigation, and slurry lines.
A.P.W.A. Green -
For surveying and general construction markings.
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