ranked mid-range among hydrologically similar sites, while the 

 total phosphorous concentration was the highest of any sample site 

 with surface drainage and among the highest for the entire sample 

 set. 



Gaffney Lake's arsenic concentration ranked among the highest in 

 the sample set and in it's classification. The reported boron 

 concentration was among the highest for sample sites lacking 

 surface water outflow. Most other trace element concentrations 

 were below detection limits. 



Chemical history. Previous water quality analyses from Gaffney 

 Lake generally show more dilute conditions than at the time of the 

 DHES sampling. Specific conductance measurements in September 1984 

 and August 1980 were 3100 and 4870 microsiemens/cm, compared to 

 10500 microsiemens/cm at the time of the DHES sampling. During 

 1994 and 1995 monthly monitoring of field water chemistry, specific 

 conductance generally ranged from 2500 to 3000 microsiemens/cm; (a 

 single March 1995 measurement of 310 microsiemens/cm seems likely 

 to be either measurement error or the local effect of spring ice- 

 melt. ) 



The dissolved oxygen concentration in Gaffney Lake dropped to a 

 measured value of 4 milligrams per liter during the winter of 1995. 



Sediments. The arsenic concentration in the Gaffney Lake sediment 

 sample was among the lowest in the site classification. For the 

 most part, concentrations of other trace elements were below 

 analytical detection limits. The reported arsenic concentration 

 was well below the mean value for soils and other surficial 

 materials in the Western U.S. 



