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<br />ww <br /> <br />Draft Proposal (11/27/94) <br /> <br />Bvaluation ot contaminant impact. on rasorbaok .ucker. utili.inq <br />restored flooded bottomlands in the Upper Colorado River. <br /> <br />Kevin J. Buhl and Steven J. Hamilton <br />U.S. National Biological survey <br />Midwest Science Center <br />Yankton Field Research Station <br />RR 1 Box 295 <br />Yankton, SO 57078-9214 <br />Comm. 605-665-9217 FAX 605-665-9335 <br /> <br />Introduction <br />In effort to stabilize and enhance populations of razorback <br />suckers and other endangered fishes in the upper Colorado River, <br />the Flooded Bottom Lands Restoration Program is attempting to <br />restore floodplain habitats for use by razorback sucker larvae <br />and adults. The proposed strategy for achieving these goals is <br />to reconnect selected floodplain habitats to the main river <br />channel in a manner that simulates historic hydrological , <br />conditions. An important component of this program is to select <br />sites that after restoration will not pose contaminant problems <br />to the fish. Preliminary site screening processes have selected <br />two sites in the Colorado River, Walter Walker State Wildlife <br />Area and Adobe Creek, to serve as pilot test sites for evaluating <br />the potential of these remediation measures to restore suitable <br />habitat for razorback suckers. One of the proposed benefits of <br />the restoration efforts is that increased river flows into these <br />habitats may reduce the concentrations of selenium and other <br />inorganic contaminants. In order to determine the potential <br />hazard posed by selenium and other inorganic contaminants present <br />at these sites to razorback suckers, ambient concentrations of <br />selenium and other inorganic contaminants in water, sediments, <br /> <br />1 <br />