reporting limits. 



Chenical history. No previous chemical data from this site are 

 known. 



Sedinents. Extractable concentrations of arsenic, chromium, 

 copper, nickel, vanadium and zinc rank near the upper end of the 

 ranges shown for western sites, reflecting contamination of 

 surficial sediments with mineral processing waste. WET75 was also 

 one of the few sites with a reportable mercury concentration (at 

 the reporting limit) . 



The extractable arsenic, copper, and zinc concentrations exceed the 

 geometric mean soil concentrations for the western United States 

 by factors of 4, 4.8 and 2.4 respectively. Other trace element 

 concentrations are near or below the regional means. 



