11 



distance of 4,000 feet with an average surface concentration 

 which was five times the value found at the bottom near the 

 outfall. 



The phosphate and nitrate reflect the same distribution; 

 the shift of the area of concentration, the increase of concen- 

 tration on December 20, and the similar location of the areas 

 of high concentration. 



The surface distribution of the nutrients on December 19 

 had a lobate character extending generally to the southeast 

 and east (Figure 4). The influence of the silicate and nitrate 

 fields were still apparent almost 25,000 feet from the outfall; 

 even though the average concentration of the nutrient salts 

 for both days, plotted against depth and distance from the out- 

 fall, reveal the simple form of dispersion in the surface layers 

 (Figure 1)» 



Hyperion Outfall 



The vertical distribution of the nutrients around the 

 Hyperion outfall on January 12 and 13, 1956, were different 

 than those near the Orange County outfall (Figure 5). In 

 addition to that portion of the nutrients which rose to the 

 surface with the effluent, a subsurface layer was present for 

 all except ammonia. It is believed that this striking dissim- 

 ilarity between the two areas is due to the chemical and 

 physical differences of the two effluents. Although only 

 four paramaters had been measxired in the Orange County effluent, 

 (chlorinity, suspended solids, phosphate, and coliforms) and 

 three in the Hyperion effluent (chlorinity, suspended solids. 



