File - In a Dec. 27, 2010 file photo, a fallen tree supports numerous heron nests in the mud of Southern California's Salton Sea. As public officials sought a solid answer for what made Monday, Sept. 10, 2012 so pungent in Southern California, one answer proposed was a weather-aided waft of a fish die-off from the Salton Sea. (AP Photo/Lenny Ignelzi, File)

Associated Press
File - In a Dec. 27, 2010 file photo, a fallen tree supports numerous heron nests in the mud of Southern California's Salton Sea.  As public officials sought a solid answer for what made Monday, Sept. 10, 2012 so pungent in Southern California, one answer proposed was a weather-aided waft of a fish die-off from the Salton Sea. (AP Photo/Lenny Ignelzi, File)
File - In a Dec. 27, 2010 file photo, a fallen tree supports numerous heron nests in the mud of Southern California's Salton Sea. As public officials sought a solid answer for what made Monday, Sept. 10, 2012 so pungent in Southern California, one answer proposed was a weather-aided waft of a fish die-off from the Salton Sea. (AP Photo/Lenny Ignelzi, File)
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