Data from these initial, winter low-flow conditions 

 indicated that the most toxic species of copper constituted 

 about 6 . 3 percent of the total amount of copper in the 

 river. During winter, there also appears to be a significant 

 inhibition factor (buffering) provided by relatively high 

 hardness levels. 



FUTURE ACTIVITIES ; Bimonthly sampling will continue through 

 the summer of 1986. Some additional analyses and species 

 equilibria calculations for metals other than copper are also 

 planned to be conducted. Samples collected during runoff 

 1986 will be of special interest. A model or models will be 

 developed to interpret copper toxicity and the transport of 

 copper through the study area. 



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