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<br />N <br />10-" <br />...J .. <br />c.o <br /> <br />much as 31 ).Ig/g. The sources of selenium at stewart Lake are <br />irrigation drainage and shallow__ ground water flowing through <br />sedimentary deposits of marine and nonmarine origin. <br /> <br />A significant linear relation (R'=0.65), exists between <br />concent~ations of dissolved selenium discharging to Ashl~y Creek <br />and concentrations of dissolved solids, but no relation (R'=<0.011 <br />exists ~etween loads of selenium and loads of dissolved solids. <br />This indicates that salinity controls that are chosen only to treat <br />large sources of salt loading may fail to control loads of <br />selenium. <br /> <br />Concentrations of selenium in a pond at the Ouray National Wildlife <br />Refuge, which receives irrigation water and shallow ground water, <br />were as high as 93 ).Ig/L. Liver tissues from coots collected on <br />this po~d contained as much as 43 ).Ig/g, and water bird eggs <br />contained as much as 120 ).Ig/g (dry weight). The source of the <br />contamination is' shallow ground water which contains as much as <br />9,300 ).I9/L of- selenium. study results indicate that only 10 <br />percent of the refuge is contaminated. <br /> <br />Consumption of fish or fowl from stewart Lake or contaminated areas <br />at Ouray National Wildlife Refuge could provide amounts of selenium <br />that exceed the "safe and adequate" intake suggested by the <br />National Academy of Sciences. The Utah Department of Health issued <br />a health advisory in 1988 limiting consumption of fish and <br />waterfowl from Stewart Lake to 10 ounces per week. <br /> <br />In FY 1991, the Bureau of Reclamation, with input from USGS and <br />Fish and Wildlife Service (FWS), began planning remedial action at <br />the contaminated sites. USGS and FWS will continue to monitor the <br />areas until a remedial plan is selected in FY 1993. <br /> <br />Uinta Basin Ground-Water Salinity Monitoring <br /> <br />In 1992, the U.S. Geological Survey, Water Resources Division, <br />collected water samples from ten water wells in the Uinta Basin in <br />cooperation with the Utah Division of Oil, ~as, and Mining. The <br />samples were analyzed for constituents typically associated with <br />oil-field brines in an effort to detect early any movement of <br />saline water, related to injection of oil-field brines as a method <br />of disp~sal, into the aquifers used for water supply in the area. <br />Constituents analyzed included common ions, total dissolved solids, <br />halogens, boron, barium, strontium, lithium, and isotopes of <br />hydrogen, oxygen, and sulfur. Dissolved-solids concentration in <br />water f~om one well has increased from August 1991 to July 1992, <br />but the cause has not yet been determined. <br /> <br />,L 1 <br /> <br />I <br />\; 'f <br />:,j:~ >:1: <br />'. ..:io.___ ~;_' .;&-,';' "'",L,-,..i~;',_~ _~~~& <br />