The ammonium concentration in this sample is uniquely high for 

 sample sites in the Rocky Mountains, exceeding all other sample 

 sites by an order of magnitude. The orthophosphate concentration 

 was also the highest for Rocky Mountain sites, though not disjunct 

 from the range shown by other sites as was the ammonium 

 concentration. The total organic carbon concentration ranked mid- 

 range among Rocky Mountain sites. 



The boron concentration was the highest shown by Rocky Mountain 

 sites, most of which did not contain the element in reportable 

 concentrations. Arsenic, iron and copper were reported at 

 concentrations ranking mid-range within the site classification. 

 Most other trace elements occurred at concentrations below the 

 reporting limits. 



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



Sediments. In comparison to other dilute Rocky Mountain sites, 

 the McKillop Creek wetland appears to display a diverse array of 

 detectable trace elements. Arsenic, boron, copper, nickel, 

 selenium, vanadium and zinc were all reported at concentrations 

 ranking the site mid-range among similarly classified sample 

 wetlands. Only selenium (by a factor of 1.7) and zinc (by a small 

 amount) exceeded the mean concentrations for soils and other 

 surficial materials in the Western United States. 



