14 ( UPI ) -- A bipartisan group of U.S. senators says the Navy should carry out a $ 1.8 million study of tainted drinking water at Camp Lejeune , N.C. Sens. Kay Hagan , D-N.C. , Richard Burr , R-N.C. , Bill Nelson , D-Fla . , and George LeMieux , R-Fla . , have sent a letter to Navy officials urging they follow through on a request by the U.S. Agency for Toxic Substances and Disease Registry , part of the Centers for Disease Control and Prevention , to carry out the study at the Marine Corps camp , the military newspaper Stars and Stripes reported Monday .