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<br />N <br />"'.... <br />-J <br />0') <br /> <br />constitqents that can be used to define the source(sl and <br />pathway(sl of the saline water in the freshwater aquifers, (21 to <br />utilize surface-geophysical techniques to determine the area and <br />volume of the aquifers that contain saline water, (3) to utilize <br />the geochemical data from objective 1 in forward and inverse mixing <br />models and the geochemical pattern-recognition model ARTHUR to <br />identif~ and quantify source solutions throughout the freshwater <br />aquifer~, and (41 to reconstruct the historical process by which <br />saline water has moved into or has been generated within the <br />aquifers, and identify probable future paths of movement. <br /> <br />A report, summarizing well records and chemical data for water from <br />wells within the study area was completed and published during FY <br />92. Data collection continued during FY 92 and included sampling <br />sixteen 'additional wells and one source of brine. Water samples <br />were analyzed for major ions, selected minor and trace elements, <br />sulfur, oxygen, hydrogen, and strontium isotopes, and total organic <br />carbon. Fresh to moderately saline water was sampled from wells <br />completeld in the Navajo, Entrada, and alluvial aquifers. Water <br />from wel'ls not sampled for water-quality analyses was measured for <br />pH, temperature, and specific conductance. <br /> <br />Chloride, bromide, iodide, del 0-18, and del H-2 data from the <br />study site were utilized to provide preliminary information about <br />sources of saline water from the Navajo aquifer and to guide <br />sampling priorities for FY 93, Comparison of br,bmide <br />concentrations in oil-field brines collected from the study area to <br />non-oil":field brines showed enrichment of bromide:chloride weight <br />ratios by a factor of about 7, This enrichment factor was used to <br />construct mixing models using bromide and iodide to determine the <br />contribution of sampled oil-field brine to salinity increases in <br />the Anetih area. Del 0-18 and del H-2 data were used to assist in <br />verifyin;g the mixing relationships suggested by the bromide and <br />iodide mixing models. Data-collection and interpretive activities <br />will continue during FY 93. <br /> <br />Irrigation Drainage and Selenium-Middle Green River Basin <br /> <br />Detailed study of wildlife areas in the middle Green River basin <br />of Utah during 1986-90 has shown that concentrations of selenium in <br />water and biological tissues were harmful to wildlife at the <br />Stewart Lake Waterfowl Management Area, lower Ashley Creek, and the <br />Ouray National Wildlife Refuge, The sourc~s of the Ashley Creek <br />contamination were springs and seeps that discharged water <br />containing as much as 9,000 jlg/L of selenium. Selenium <br />concentrations in irrigation drainage entering Stewart Lake ranged <br />from 14 to 140 jlg/L; liver tissue from coots collected from the <br />lake contained as much as 26 jlg/g; and samples of carp contained as <br /> <br />i ,~ <br /> <br />,~~,~, ..d', <br /> <br />~, ",",,'"; -;;jtnll <br />