The seasonal biological surveys of 1971 / John C. Ayers, Samuel C. Mozley, John A. Stewart.

TABLE 1A. Additional stations for phytoplankton only (all
in 4 ft of water).

Station

Position relative to the Cook Plant

NDC-. 5-0
NDC-1-0
NDC-2-0
NDC-4-0
SDC-. 5-0
SDC-1-0
SDC-2-0
SDC-4-0

1/2
1
2
4
1/2
1

mi north of the plant, just off
It It

the beach

II.I

I,
I!

mi south of the plant, just off
it tI

the beach

2
4

II
II

II
It

COOK PLANT PREOPERATIONAL STUDIES

A.2 STUDY OF FLOATING ALGAE AND BACTERIA
THE THERMAL BAR IN THE COOK SURVEY AREA
During the survey of 15 April 1971 the thermal bar of southeastern Lake
Michigan was present in the Cook Plant survey area and ran in a sinuous line
from south to north at distances between two and four miles from the beach.
The position of the bar as derived by linear interpolation between the statioi
surface water temperatures is shown in Figure 2; it quite closely approximate
the 18-m depth contour.
The data have been inspected for any evidences that convergence along th4
4~C isothermal might be concentrating materials there. The evidence, if any,
is slight and inconclusive. In comparisons of water color across the isotherl
there were no significant color changes. Secchi disc transparencies lakeward
of the bar were greater by 1.0 to 2.3 m, but this could possibly be a reflection of the smaller numbers of phytoplankton there.

5