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

INTRODUCTION

In Part VII (March 1971) of our report series relative to the Donald C.
Cook Nuclear Station, we established the following report format:
A. COOK PLANT PREOPERATIONAL STUDIES
A.1 Recording of Local Water Temperatures
A.2 Study of Floating Algae and Bacteria
A.3 Development of a Monitor for Phytoplankton (ABANDONED)
A.4 Study of Attached Algae
A.5 Study of Zooplankton
A.6 Study of Aquatic Macrophytes
A.7 Study of Benthic Organisms
A.8 Study of the Local Fishes
A.9 Support of Aerial Scanning
A.10 Study of Entrainment and Impingement
B. SURVEYS OF EXISTING WARM WATER PLUMES
C. THE ICE BARRIER AT THE COOK PLANT SITE
D. EFFECTS OF EXISTING THERMAL DISCHARGES ON LOCAL ICE BARRIERS
E. EFFECTS OF RADIOACTIVE WASTES IN THE AQUATIC ENVIRONMENT
E.1 Gamma Scan of Bottom Sediments (FINISHED)
E.2 The Most Sensitive Organism for Concentration of
Radwastes (FINISHED)
E.3 Study of Lake Michigan's Present Radioactivity Content
(FINISHED)
This report covers only items A.2, A.5, and A.7 of the above format.
These studies constitute four surveys of the large-scale set of biology stations related to the Donald C. Cook Plant carried out during 1971.
The layout of sampling stations, with indication of how the stations are
numbered, is given in Figure 1. The sampling stations, their positions relative to the Cook Plant, their distances offshore, and the water depths encountered are given in Tables 1 and 1A.
The four biological surveys of 1971 were carried out on 15 April, 9 July,
2 September, and 8 November. Station DC-1 could not be occupied in July or
September because of dredges working at the station position; in November the
NDC-7 and SDC-7 stations were not visited because of high seas and severe
cold.
Except for omissions pointed out above, phytoplankton samples were taken

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