FILE - In this July 13, 1994 file photo, a cavernous hole, 106 ft. wide by 185 ft. deep, opened in the center of an IMC-Agrico waste stack near Mulberry, Fla., The sinkhole, shown in photo taken July ... more 
FILE - In this July 13, 1994 file photo, a cavernous hole, 106 ft. wide by 185 ft. deep, opened in the center of an IMC-Agrico waste stack near Mulberry, Fla., The sinkhole, shown in photo taken July 13, 1994, at IMC-Agrico's New Wales plant released 20.8 million pounds of liquid phosphoric acid into the ground below. The company was able to clean up the spill before it harmed the drinking water supply, regulators say. (AP Photo/Selbypic) less 
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Associated Press | Photo By Selbypic
Fri, Mar 1, 2013 1:06 PM EST