Washington Specifications & Guidelines

7-09.3 (20) Water Mains, Detectable Marking Tape

"Detectable marking tape shall be installed over nonmetallic water lines including services lines. The tape shall be placed approximately 1 foot above the top of the line and shall extend its full length. Detectable marking tape shall meet the requirements of Section 9-15.18."

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8.03.3(6)A2 Irrigation Systems, Detectable Marking Tape

"Detectable marking tape shall be placed in all trenches 6 inches directly above, parallel to, and along the entire length of all nonmetallic water pipes, sleeving, wiring, conduits, and casing pipes. Detectable marking tape shall meet the requirements of Section 9-15.18."

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8-20.3(5)A1 Fiber Optic Conduit

"Where conduit to contain fiber optic cable or conduit identified to contain future fiber optic cable is installed by open trenching, Detectable Underground Warning Tape shall be placed 12-inches above the conduit unless otherwise detailed in the Plans. Detectable Underground Warning Tape shall extend 2-feet into boxes or vaults. Splicing of the tape shall be per the tape manufacturer’s recommended materials and procedures."

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9-15.18 Irrigation System, Detectable Marking Tape

"Detectable marking tape shall consist of inert polyethylene plastic that is impervious to all known alkalis, acids, chemical reagents, and solvents likely to be encountered within the soil, with a metallic foil core to provide for the most positive detection and pipeline location.

The tape shall be color coded and shall be imprinted continuously over its entire length in permanent black ink indicating the type of line buried below and shall also have the word 'Caution' prominently shown. Color coding of the tape shall be as follows:

Utility Tape - Color
Water - Blue
Sewer - Green
Electrical - Red
Gas/Oil - Yellow
Telephone/CATV - Orange
Non-Potable Water - Purple

The width of the tape shall be as recommended by the manufacture based on depth of installation."

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9-29.1(6) Illumination, Signal, Electrical; Detectable Underground Warning Tape

"Detectable Underground Warning tape shall be Orange imprinted in black lettering with the message “FIBER OPTIC CABLE BURIED BELOW” or equal. The warning tape shall be polyethylene with a metallic backing. The polyethylene shall be a minimum 4 mils thick and 3 inches wide."

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