SSPOT is a user-friendly tool with integrated algorithms to help users determine the optimal placement of samples needed to comprehensively understand soil activity in various soil types over time.

On his map, Nebraska, for example, is covered with the state's dark brown Holdrege loam, while Maine is represented by its pale Chesuncook glacial soil.

YUTAN -- The U.S. Army Corps of Engineers says it has cleaned up all of the contaminated soil at the former Nebraska Ordnance Plant near Mead.