Locating elements of construction beneath the surface of earth soils

Claim 1

In an area of earth soil which carries beneath the surface thereof at least one underground facility and a frangible colored body beneath the surface and located above and overlying the underground facility, the frangible body having a coloring coded to the type of facility and printing identifying the type of facility, the improvement wherein the frangible colored body comprises: a sheet of clear plastic film having printing indicia in the form of a cautionary phrase on the film lower, inner face visible through the film upper, outer face, the printing indicia identifying the type of underground facility; a sheet of flexible metal foil bonded to the plastic film lower, inner face, the metal foil having a plurality of color coded striped indicia on the foil upper, inner face, each of the color coded striped indicia having a color coded to correspond to the type of underground facility and being visible through the plastic film upper, outer face; and a plurality of light reflective stripes on the foil upper, inner face being visible through the plastic film upper, outer face, and contrasting with the color coded striped indicia and with the surrounding earth soil to provide high visibility of said frangible body under a variety of earth soil color conditions.