" ... 6. Provide detectable warning tape on all underground non-metallic lines. Use acid and alkali-resistant, PE film warning tape manufactured for marking and identifying underground utilities, a minimum of 6 inches wide and 4 mils thick, continuously inscribed with a description of the utility. The tape shall have a metallic core encased in a protective jacket for corrosion protection, detectable by metal detector when tape is buried up to 30 inches deep. Follow APWA and ANSI/ASME A13.1 for installation and color requirements."
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