Louisiana National Guardsman Spc. Allen Cormier of Central, La., feels the ground under the water for signs of a sand boil on the west side of the Mississippi River levee outside of Vidalia, La., May 14. More than 25 members of the 225th Engineer Brigade have been working 24 hours a day searching for sand boils and looking for seepage along portions of the 72 miles of levee that protect Concordia Parish from the brimming Mississippi River.