VI-125 



2. Study the effects of combined wastes, i.e., multiple 

 pollutants. 



3. Ascertain water quality requirements for desired uses. 



4. Develop water quality criteria for optimal beneficial 

 use rather than minimum tolerable quality. 



E. Natural variability 



1. Determine the natural variability of the biotic 

 populations as well as of the physical -chemical 

 environment and water quality. 



2. Learn to distinguish between the effects of natural 

 variability and of man-induced alterations. 



F. Interface Factors 



1. Determine the amounts and quality of fresh water 

 required to support the desired estuarine ecosystem. 



2. Identify and understand the characteristics, the 

 phenomena associated with, and the influence of the 

 estuary-ocean and estuary-fresh water interfaces. 



3. Identify and quantify the residual pollutants introduced 

 by land drainage and their effects. 



4. Determine the relationships of contiguous wetlands 

 to estuarine ecosystems. 



5. Determine exchanges between the bottom sediments and the 

 overlying water mass. 



