Sodium Dichromate (Chromium) and various effects on the environment?

So I have been doing research for a project and am having some difficulty getting started on a particular problem relating to sodium dichromate (Chromium).  
Specifics:
-120 km of road has Sodium Dichromate spilled on it.
-Possible run off of Sodium Dichromate into side ditch which lead to dugouts.
-Dugouts filled with rainbow trouts.
-One dugout was treated last summer with copper sulfate for control of aquatic plants.
-The dugouts are covered with ice.
-20m from road is a water well.

Question is: what are the possible effects to the fish, cattle, and humans, along with recommendations for the well?
The addition of the copper sulfate is also confusing me.  

If you could help me get a professional idea on this question it would be greatly appreciated.