(calcium and magnesium) and sodium were present in similar 

 proportions. Mineral equilibria indicate oversaturation with 

 carbonate phases. Nitrate and ammonia concentrations were below 

 detection limits, and phosphorous concentrations (total and 

 orthophosphorous ) were near the lower end of the ranges shown for 

 all sample sites. 



Arsenic, boron, copper and iron concentrations were low to moderate 

 in comparison to similarly classified sites. Zinc and lead were 

 reported at concentrations near the high end of the range shown for 

 the classification. Most other trace element concentrations were 

 below detection limits. 



Chemical history. No other water quality data from this site are 

 known. The site is probably leant hydrologic stability by ground- 

 water storage in the Burns Creek alluvium and (possibly) in upland 

 gravels and clinker; water quality variability may be less than for 

 many of the plains sampling sites. 



Sediaents. Extractable copper, boron, arsenic, vanadium, nickel 

 and zinc were all reported at concentrations near the lower end of 

 their respective ranges for sites classified with Burns Creek. 

 The reported boron concentration exceeded the mean for western U.S. 

 soils by a factor of two; concentrations of other elements were 

 below regional mean soil values. 



