8 
ferences between the effluents might be a considerable factor of 
importance, 
Two parameters that would probably affect coliform dis- 
appearance are analyzed by the sanitation districts with enough 
frequency to give satisfactory averages, These are suspended 
solids and chlorinity. The averages for the three outfalls are 
as follows: 
Average 
daily flow - mgd 25 
Average 
Suspended solids 115 
ppm 
Average 
chlorinity 
0/00 2.5 0.25 
BOTTOM SEDIMENTS IN THE OUTFALL AREAS 
Whites Point 
The sea floor of the continental shelf off Whites Point is 
an area of accumulation of land-derived sandy silts. The color 
of the sediment ranges from dark olive-green to black, the latter 
color being the result of a high sludge content in the sediment. 
Bottom material with a high sludge content releases a strong odor 
of hydrogen sulfide, an indication of oxygen deficiency (Table 1). 
All material in the sampling area, which covered 1.5 square miles 
around the outfall, contained varying quantities of the particulate 
sewage debris, but there is no apparent pattern that would be 
indicative of different rates of sludge sedimentation. 
