6Q.SO sampled during periods when they cariued large amoxints of drainage 

 water. 



It became apparent at about the middle of the field-collecting 

 phase of the investigation that, with the resources at hand, the labora- 

 tory work would not be completed in the time available. The biological 

 program was therefore reduced by approximately one -third for the remainder 

 of the investigation. This was accomplished by discontinuing some sta- 

 tions, and sampling on a bimonthly basis at certain others. 



In addition to sajupling of bottom organisms and attached plants, 

 the following measurements were made: temperatiire of water and air; 

 weather conditions; dissolved oxygen at the surface and at the bottom 

 of the river; dissolved oxygen in the gravels at selected locations known 

 to be important for fish spawning activities; water transpstrency; plankton 

 samples; and bottom sediment sizes. No attempt was made to collect or 

 evaluate fish populations during the investigation. 



-3- 



