"Install underground utility warning tape immediately above the circuit cables that are in duct or conduits. Bury the tape at a depth of 6 to 10 inches."
"Provide tape that is 6 inches wide and 7.0 mils (nominal) thick. Provide tape that has a minimum tensile strength of 600 pounds per 6 inch width and that is color-coded and impregnated with alkali and acid stable, lead-free, organic pigments that are suitable for direct burial. Use tape that is ultraviolet colorfast and non-distorting with no elongation. Use tape that includes black lettering and symbols on a gray background that conforms to the APWA-ULCC national color code for DOT. Provide tape that continuously reads, "CAUTION: ELECTRIC LINE BURIED BELOW" alternating with a “No Digging” symbol."