The western portion of Pond #1 has been treated and capped and the 

 process of establishing vegetation on the capped surface begun. 

 Future water levels in the eastern portion of Pond #1 may be 

 manipulated to retain reducing conditions in wetland sediments. 



Water chemistry. At the time of sampling, Pond #3 at WET78 

 exhibited relatively dilute, moderately alkaline calcium- 

 bicarbonate chemistry. Mineral equilibria indicate near-saturation 

 with carbonate phases. Nitrogen and phosphorous concentrations 

 rank mid-range in comparison to other sites of the intermontane 

 valleys. The total organic carbon concentration was low in 

 comparison to other sites in this class. Water-column 

 concentrations of arsenic, copper, cadmium, iron and zinc rank at 

 or near the upper end of the ranges shown by intermontane valley 

 sites, and are generally higher than those at the other two Warm 

 Springs Ponds sites. Other trace element concentrations were below 

 reporting limits. 



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

 Data from a site approximately 1 mile from WET78 include seasonal 

 time-series water quality analyses. See the site bibliography for 

 references. 



Sediments. Sediments from WET78 display highly elevated 

 concentrations of trace elements. Extractable concentrations of 

 arsenic, copper, lead, mercury, selenium, and zinc near the top of 

 the ranges shown by sites of the intermontane valleys, and for most 

 elements are exceeded only at other sites contaminated with mining 

 and mineral processing wastes. Extractable concentrations of all 

 of these elements (and boron) exceed the geometric mean values for 

 soils of the western Unites States by up to factors of 50. 



