18 
winter months, there was no particular turbid layer, the material 
settling to the bottom within a short distance of the outfall. 
Whites Point Outfall Area 
Temperature distributions in the immediate waters surrounding 
the Whites Point boil are typical except that the greater diffusion 
of the effluent prevents the development of the sharp temperature 
inversions noted at Orange County and Hyperion. The inversions 
in these waters are spread through a thicker layer of water and 
the temperature ranges are smaller. 
The surface water layer was usually separated from the sub- 
surface water by a marked thermocline which was complex in structure. 
Turbid layers derived from the sewage discharge were closely associ- 
ated with the thermocline, but in this area generally below rather 
than above. As in the other areas, the surface water temperature 
approaches that of the subsurface water in the winter, eliminating 
the thermocline and consequently, any discrete intermediate turbid 
layer (Table 6). 
Hyperion Outfall Area 
Thermograms from the Hyperion outfall area show similar 
features to those from the Orange County coastal waters, Temper=- 
ature inversions are even more striking and extend for greater 
distances, in some instances being marked as far as three miles 
from the outfall. Thermoclines were also complex showing the 
incomplete mixing of several distinct water masses in the diluted 
zone, Temperature conditions in this water area differ significantly 
from those near the Orange County outfall. In the latter waters, 
surface heating in the winter is minor causing the temperature of 
