265 



On fourteen cruises in the bay, between September 9, 1955 

 and August 21, 1956, 5,326 drift cards were released, of which 

 34% were recovered. Included in tlje patterns were stations 

 near the terminals of the proposed sludge and effluent outfalls. 



During the period of September 8, 1955 through February 

 16, 1956, the pattern of surface flow was variable, but the 

 bay appeared to be well flushed, at least intermittently, by 

 relatively strong currents directed either to the north or 

 to the south. Of the five cruises during this interval, on 

 only one (September 29, 1955) was there a general drift to 

 the east and inshore from part of the area. On one (September 

 8, 1955) the initial drift was to the north and outside the 

 bay, and on the other three the surface waters appeared to 

 have been removed almost completely from the bay (December 29, 

 January 18, and February 16), 



Beginning on February 22, and extending through the cruise 

 of August 9-10, 1956, the predominant drift was toward the 

 shores of the bay, but frequently superimposed upon this was 

 a moderate southerly or northerly component. Many of these 

 later cruises, as well as the earlier one of September 29, 1955, 

 showed signs of a divergence in the current as the water 

 approached the shore. It is most clearly marked on the charts 

 showing drift card returns of September 29, Area III and of 

 August 9-10, where returns trom stations north of a particular 

 line were separated by an evident gap from those below the 

 line. The cruise of August 19-20, 1955, with its strong north- 

 ward component and low velocities suggests a return to con- 

 ditions noted in the fall of 1955. 



