The recoverable boron concentration at WET69 ranked near the upper 

 end of the range shown for sites of the intermontane valleys and 

 western sample sites overall. Arsenic, copper, zinc and lead 

 (slightly above the reporting limit) also ranked relatively high 

 in comparison to intermontane valley sites, exceeded mainly at 

 wetlands experiencing known impacts from mining and mineral 

 processing. 



Chemical history. No other data from this site are known 



Sediments. The relatively high extractable calcium concentration 

 may in part reflect authigenic carbonate precipitation from 

 influent ground water. Extractable concentrations of trace 

 elements are generally high; arsenic, boron, copper, and lead rank 

 near the upper end of the ranges shown for the intermontane valleys 

 and among western are exceeded mainly at those with known impacts 

 from mining and mineral processing. Arsenic, boron, copper, lead 

 and zinc exceed the geometric mean soil concentrations for the 

 western United States by factors of 5.5, 3.6, 3.9, 5.8 and 2.3 

 respectively. 



