Cook Plant preoperational studies 1970 / John C. Ayers ... [et al.].

This was a marginal day, with wind out of the southwest at 20 mph and
wave and surf conditions according; our sampling was in the period 1500 to
1630 when we believed the plane to be coming.
As shown in Table 13, the water colors on this day indicate the presence
of four slightly differing water masses each of which is a blend of the two
water masses characteristic of the region: green offshore lake water, and
the brown effluent from the St. Joseph River.
Analyses of phytoplankton samples representative of each of the four
apparent water masses also indicate blending of offshore water and river water.
The results suggest that a recent storm had fairly well mixed the area
and that the general lake circulation had not yet reestablished the typical
condition of more distinctly different water masses.
B. SURVEYS OF EXISTING WARM WATER PLUMES
The Bagged-Water Technique for Testing In Situ Response of Planktonic
Organisms to Waste Heat of Existing Generating Plants. During the winter of
1969-70 Drs. Ayers and Arnold worked extensively on the problem of tests
adequate to investigate the observed fact that plumes of warm cooling water
from existing electric generating plants are not supporting nuisance blooms
of planktonic algae as a result of their discharged excess heat.
After several sorts of experiments had been considered and discarded, it
was decided to try an experimental technique that appeared capable of testing
the combined effects of passage through a generating plant and the effects of
waste heat in the plant plume. The technique is simple, direct, and allows
separate evaluation of the effects of 1) waste heat alone, 2) passage through
the plant without waste heat effects of the plume, and 3) the combined effects

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