This Standard provides a framework for the classification of subsurface utility location and attributes information in terms of specified quality levels.This Standard applies to subsurface utilities and associated surface features that facilitate the location and identification of subsurface utility infrastructure. These features may include access chambers, stop valves, terminal pads and other surface related facilities. This Standard does not apply to utility infrastructure that is above the surface, such as overhead wires.This Standard applies to all existing (including redundant) and under-construction subsurface utility infrastructure.For the purpose of this Standard, the term 'subsurface' includes 'submerged' (see Clause 1.4.21).