3. Future biological monitoring of the Sacramento River should 

 be done at intervals of about five years. Ten or 12 stations should be 

 sampled intensively during each season of the year. 



LocslL studies, in connection vith specific waste discharges 

 or problems, must be scheduled as needed. 



h. The causes and significance of variations in dissolved oxy- 

 gen within stream gravels should be determined. 



5. Future investigations shoxild be planned so that adequate 

 time is available to eveiLuate the data and write the report. It is sug- 

 gested that from three to five man-days of laboratory time be provided 

 for each man-day spent in the field. In addition, a minimum of two man- 

 days of professional time in the office for each day in the field are 

 required from the outset of the investigation for evaluation of the data, 

 and at least two more man-days are required during the final eval\iation 

 and report-writing stage. 



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