Geological Survey near WET21 in 1991 and 1992, and sampling 

 elsewhere in Freezeout Lake occurred in 1987; DHES collected time- 

 series sampling of the Freezeout-Priest Butte Lakes-Teton River 

 system in 1980-82. In comparison to the WET21 sample, specific 

 conductance near the WET21 site was up to 1.5 times higher in 1992. 

 Within the short period of record, ammonium concentrations varied 

 by a factor of 5 and orthophosphate concentration by a factor of 

 4. 



Specific conductance measurements collected by DHES from 1980 to 

 1982 at the outflow from Freezeout Lake show a range from 3000 to 

 8500 microsiemens/cm. Six drains conveying irrigation return flows 

 into Freezeout Lake ranged in average specific conductance from 832 

 to 4900 microsiemens/cm. The evaporative setting, shallow water 

 depths and variability in inflow water quality imply significant 

 spatial variability in water quality within Freezeout Lake. Trace 

 element concentrations (notably selenium) are elevated in certain 

 inflows remote from the WET21 site, and may be largely removed from 

 the water column by geochemical process in the vicinity of inflow. 



Sediments. The WET21 sediment sample contained arsenic and copper 

 concentrations which ranked low within the site classification. 

 Boron and zinc concentrations ranked mid-range within the site 

 classification, and the vanadium concentration reported was among 

 the highest for the entire sample set. Extractable cobalt was 

 reported at slightly above the detection limit, one of only five 

 sample sites with a reportable concentration. The boron and cobalt 

 concentrations exceeded the mean values for soils and other 

 surficial materials of the western U.S. by a factor of 1.7; other 

 trace element concentrations were below the regional mean values. 



