alkalinity. Equilibrium calculations indicate moderate 

 oversaturation with respect to carbonate minerals. Depressed 

 dissolved oxygen and apparent non-equilibrium of pH, carbonate and 

 bicarbonate with surface conditions may reflect ground-water 

 discharge to the WET80 site. The high sodium concentration (64% 

 of the cation load in meq/1) may reflect some input from deeper 

 aquifers to the alluvial gravel aquifer. 



The nitrate concentration at WET80 was below the reporting limit; 

 the ammonium concentration was among the highest for sample sites 

 from the unglaciated plains province. Phosphorous concentrations 

 were also relatively high, exceeded in the region mainly by closed- 

 basin sites. The total organic carbon concentration ranked mid- 

 range among sites of the plains. 



Arsenic, boron, and copper concentrations ranked mid-range or lower 

 in comparison to the site class, while iron and lead concentrations 

 ranked relatively high. Most other trace elements analyzed were 

 below reporting limits. 



Chemical history. No previous data from this site are known. 



Sedinents. Most extractable trace element concentrations are 

 relatively low in comparison to other sites of the unglaciated 

 plains. Extractable lead and zinc concentrations, however, rank 

 relatively high, and in the case of lead are exceeded almost 

 entirely by sites with known impacts from mining or mineral 

 processing. Boron, lead and zinc concentrations exceed geometric 

 mean concentrations for soils of the western United States by 

 factors of 2.3, 2.4 and 1.5, respectively. Other trace element 

 concentrations reported are below regional geometric mean soil 

 values. 



