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North Dakota SPECIFICATIONS & guidelines
North Dakota Department of Transportation
NDDOT Standard Specifications for Road and Bridge Construction, 2022
Section 724.04 C.5
Construction Requirements, Water Main, Marking Tape
“During backfilling, install marking tape 2 feet above the water main. Use non-detectable tape with a minimum width of 5 inches. Use blue tape with the words “CAUTION, WATER LINE BELOW” imprinted on the tape in black capital letters.”
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