with gypsum. 



Water column zinc and copper concentrations were among the higher 

 values for hydrologically similar sites. Other trace element 

 concentrations were below detection limits or were near mid range 

 for hydrologically similar sites. 



Orthophosphate and total phosphorous concentrations were the second 

 highest among the entire sample set. As with other very high 

 phosphorous sites, almost all of the total phosphorous occurred as 

 orthophosphate. Nitrate was reported at the detection limit of .01 

 mg/1 and ammonium was found to be below detection limits. The 

 total organic carbon concentration was near the upper end of the 

 range for all sample sites. 



Chemical history. No chemical data prior to the DHES sampling are 

 known for the Long Lake site. Measurements in August of 1994, two 

 months after sample collection, showed specific conductance of 

 20500 microsiemens/cm. This represented a fourfold seasonal 

 increase in two months. With this concentration increase. Long 

 Lake probably reached saturation with gypsum and other mineral 

 phases. Water quality is inferred to be typically very transient 

 due to shallow basin geometry, high effective evaporation rates and 

 the lack of surface outflow. 



Sediments. Concentrations of nickel, chromium, vanadium, selenium 

 and zinc were at or near the upper end of the range for sample 

 sites of this hydrologic type. Concentrations of zinc, nickel, 

 selenium and arsenic exceed mean soil values for the western United 

 States. Very high iron concentrations, in combination with 

 obviously reduced sediment conditions, suggest possible iron 

 sulfide (pyrite) formation. 



