Sediments. Extractable concentrations of arsenic were toward the 

 low end of the range shown for sites of the glaciated plains. Most 

 other trace elements with reportable concentrations (boron, copper, 

 chromium, iron, nickel, vanadium and zinc) ranked toward the upper 

 end of their respective ranges. Only boron (by a factor of 2) and 

 zinc (1.2) exceeded the mean soil values for the western United 

 States. 



