41 



December 19, 1955, and in March and April, 1956. The average 

 increase in volume at Orange County and Whites Point was 

 about eleven times that in the surrounding waters, and at 

 Hyperion the increase was seven times. Furthermore, at 

 Orange County, there were stations where the increase was 30 

 to 40 times that in the nearby waters. 



In several samples, the greater volume in the boil was 

 accompanied by em increase in the percentage of zooplankton. 

 The increase was due to fewer numbers of dinof lagellates; the 

 diatom numbers remaining more or less constant. All samples 

 from boil areas did not show this increase. Some, particularly 

 those at Orange County, showed no change from samples taken 

 several thousand feet from the outfall. 



Distribution with Time . The average ntimber of plankton 

 for each month from August 1955 through July 1956 are shown 

 in Figure 15. The lowest numbers occurred in the latter part 

 of September and in October 1955; the maximtim for the year in 

 December. There was a secondary low in January and then began 

 a general rise to the secondary maximum in May. This seasonal 

 distribution does not correlate with the average for southern 

 California noted by Allen (1941) in his studies extending 

 over a period of 20 years. His normal distribution showed a 

 peak abundance in April? in general decrease through October 

 followed by a slight increase in November? then a rapid drop 

 to the winter low. However, in 1932, numbers of dinof lagellates 

 in December were nearly as high as the maximum in April. A 

 similar condition occurred at Oceanside in 1922 and 1924, when 

 diatoms were high in December, although not at maximum concen- 



