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Washington SPECIFICATIONS FOR DAMAGE PREVENTION
Washington State Department of Transportation
WSDOT Standard Specifications for Road, Bridge, and Municipal Construction 2021
7-09.3 (20) 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 (2) Irrigation Systems, Construction Requirements, Excavation
“… 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 and all nonmetallic and aluminum sleeves, conduits, and casing pipes. The width of the tape and installation depth shall be as recommended by the manufacturer for the depth of installation or as shown in the Plans.”
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9-15.18 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 in 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
Electric - 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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