02540.3-13 is a part of the US Army Corps of Engineers' Standard Specification forFabric Coverings used in Construction of Underground Structures Stego. It describes the requirements for the fabrication, testing, and use of specialized fabrics for the protection of underground structures from moisture and water vapor when employed in conjunction with a waterproofing membrane. Specifically, it covers the requirements for fabric identification, roll widths, roll lengths, roll weight, mill tolerances, fabric sample testing, and field testing.