Color. In accordance with APWA Uniform Color Code for Temporary Marking of Underground Facilities. Red Electric power lines, cables, conduit, and lightning cables Orange Communicating alarm or signal lines, cables, or conduit Yellow Gas, oil, steam, petroleum, or gaseous materials Green Sewers and drain lines Blue Potable water Purple Reclaimed water, irrigation, and slurry lines *As specified in NEMA Z535.1, Safety Color Code.
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