33 
The current data obtained during the bay survey is dealt 
with in an accompanying report and will not be considered in 
detail here. However, an inspection of the drift card returns 
show that the great majority of the cards released at the sites 
of the proposed sludge and effluent lines required considerably 
longer than 24 hours to reach the beach, if they were carried 
ashore at all. Actually, only two required less than 24 hours, 
the times being 21 and 18 hours, respectively. Even this rate 
of movement would not result in beach pollution under the worst 
set of conditions assumed. Therefore, on the basis of measured 
currents around the proposed outfall sites, one must conclude 
that there is an ample margin of safety as for meeting the coli- 
form requirements set down. 
It must be pointed out that velocities of greater than 
the critical ones cited above were found in the bay. Indivi- 
dual drift cards released on 2 of the 13 trips had velocities 
exceeding 0.58 miles per hour, and on 4 of the 13 trips 
exceeding 0.31 miles per hour, with one cruise (Aug. 20 and 21) 
not included. For the most part, the high velocities were from 
cards released im the inshore stations, particularly those 
towards the south end of the bay. In some of these instances 
the cards did not move directly to the beach, so even though the 
velocities were high the actual time of travel in the water would 
have been sufficient to reduce the coliform population below the 
specified maximum. However, many cards of high velocity traveled 
directly towards shore. 
If sustained currents towards the beach of greater than 
0.58 miles per hour were observed more than 20% of the time, 
