From: feed.supplier@somewhere.cbr   
      
   ..tlet of a contaminated river.   
      
      
   I often go to the coastal area in North Carolina near where the cape fear   
   river empties into the Atlantic. The river is known to contain potentially   
   dangerous levels of GenX as a result of leakage from an upstream industrial   
   site.   
      
   I would like to make a pound or two of sea salt from water collected a few   
   miles away from that river outlet. However, making salt greatly concentrates   
   heavy metals, plastics, PFOAs and other solids that may be present in the   
   water. For this reason, it    
   would be unwise to make salt from water knowingly contaminated with some   
   unwanted solid.   
      
   So here's my question: Do I need to be concerned about making salt from the   
   local sea water since it is so close to the contaminated river outlet, or is   
   the river water so diluted by that point that it doesn't matter? I don't   
   really know how to think    
   about how dilution would take place at this kind of scale.   
      
      
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