Vl-220 



be accomplished by means of pertinent physical, chemical, 

 or biological measurements sufficient to define the signif- 

 icant nature of the water body throughout a time period 

 specified on the basis of statistical validity. 



(2) Provide a knowledge of all sources of mass movement 

 Into and residence time within the receiving water body, 

 establish the significant character* of such sources, and 

 evaluate the relative contribution of each to the nature 

 of the water body. 



(3) Provide for rapid data evaluation and Indicate the 

 response procedures appropriate for the given water 

 condition. 



Efforts to characterize wastes and receiving waters should take cog- 

 nizance of the need for rapid, accurate, and economical methods for 

 neasurenent of the selected parameters. In addition. Instrumentation 

 should be adapted or developed to perform the analyses and to trans- 

 mit or record the observed data. Finally, data analysis techniques 

 should be developed so that corrective action can be Initiated 

 promptly. 



* The phrase "significant character" for these purposes Is In need of 

 further definition and this subject Is dealt with In the main part of 

 this report. Criteria for such classification would necessarily have 

 to be applied on a case-by-case basis. 



