The ornamental design for a riser for marking and detecting a large undergroundutility, as shown and described.
FIG. 1 is a top, side and front perspective view of the riser for marking and detecting a large underground utility. The broken line illustration of a compartment is not part of the design.
FIG. 2 is a top view thereof.
FIG. 3 is a front view thereof.
FIG. 4 is a left side view thereof, the right side view being a mirror image thereof.
FIG. 5 is a bottom view thereof.
FIG. 6 is another top, side and front perspective view of the riser for marking and detecting a large underground utility as it might be used in combination with an underground utility, a belt and a beaded cable. The broken line illustrations of the underground utility, the belt, the beaded cable and the compartment are not part of the design; and,
FIG. 7 is a top, side, and front perspective view of a second embodiment of my design thereof.