Most measured trace element concentrations were below reporting 

 limits. Arsenic, copper and iron concentrations ranked raid-range 

 within this site class. Chromium was reported at the detection 

 limit, one of only three western sites with quantifiable 

 concentrations . 



Chemical history- No other surface water chemistry is known for 

 this site. 



Sediments. Extractable arsenic, iron and copper concentrations 

 rank mid-range or lower with respect to this site class, and most 

 other trace element concentrations were below reporting limits. 

 Extractable chromium and zinc concentrations, by contrast, were 

 exceeded only at sites with known impacts from mining and mineral 

 processing. These relatively elevated concentrations may reflect 

 input to the lake basin from geothermal ground water enriched with 

 trace elements. 



