calculations in doubt, however . The ammonium and total organic 

 carbon concentrations ranked mid-range in comparison to regionally 

 and hydrologically similar sites. The orthophosphorous 

 concentration was among the highest found in western Montana sites. 



Arsenic, copper and iron concentrations rank mid-range within the 

 site class. Other trace elements were below reporting limits. 



Chemical history. No other chemical data from this site are known. 

 The somewhat unusual chloride fraction raises the possibility that 

 low-level contamination with chloride salts is occurring. 



Sediments. Reported extractable concentrations of arsenic, 

 vanadium, and zinc ranked mid-range among sample sites of the 

 intermontane basins. Extractable boron, copper, nickel and 

 selenium concentrations were relatively high when compared with 

 western Montana sites lacking mine and mineral processing impacts. 

 The boron and selenium concentrations exceeded the mean 

 concentrations for soils of the western United states by factors 

 of 1.6 and 1.7, respectively. Other trace element concentrations 

 were below the regional mean soil concentrations. 



