21 



been found at various depths at Orange County and Hyperion. 

 However, on occupying the same traverse on the following day 

 these areas of high oxygen depletion were not found. For 

 example, at the Orange County outfall on December 19, a column 

 of water 2,000 feet west of the boil showed a depletion of 

 52% for the intermediate water and 77% below saturation for 

 the bottom water. The latter is the minimum value (1.38 ml/D 

 found at any of the outfalls. On December 20, the intermediate 

 water was only 6% and the bottom water 13% below saturation. 

 The pockets of low oxygen depletion, as well as areas of high 

 nutrient content, are ascribed to the hourly variations in the 

 character of the effluent, and inadequate mixing of the efflu- 

 ent on discharge. From an examination of the average distri- 

 bution of the dissolved oxygen, it is apparent that adequate 

 ventialation occurs in all outfall areas. 



The vicinity of the Hyperion outfall generally shows the 

 highest oxygen values, whereas Orange County has the lowest. 

 Of interest in the vertical sections showing oxygen deficiency 

 (average values for January 12 and 13, 1956) is the tongue of 

 supersaturated water that extended from the surface diagonally 

 into the intermediate water about 1,500 feet from the boil at 

 Hyperion (Figure '5), Saturated areas were also found around 

 the Whites Point outfall at the surface, but at the Orange 

 County outfall there was no water approaching saturation. 



Discussion 



The methods of diff^ sion at Whites Point and Hyperion 

 probably account for the difference in the nutrient distri- 



