73 



7f00' 



7Cf00'W 



4300'N 



4200' 



Figure 1 . Bathymetric map showing Massachusetts and Cape Cod Bays, present sewage 

 outfalls at President Roads and Nut Island in Boston Harbor (diamonds), location of new 

 ocean outfall for treated Boston sewage in western Massachusetts Bay (average flow about 20 

 m' s '), the boundaries of the Stellwagen Bank National Marine Sanctuary, and the location of 

 the Massachusetts Bay Disposal Site (MBDS). The annual rate of river discharge from the 

 Merrimack is about 215 m' s' and through Boston Harbor is about 10 m' s'. 



I 



