Lake Michigan environmental survey : final report / [edited] by John C. Ayers.

Second sampling cruise
25 October-6 November, 1969 —reoccupied all stations in northern portion
of lake with the exception of station EF-4.
7-11 November, 1969 —completed the second sampling of stations C-5, C-4,
C-3, C-2, C-l, B-4, B-3, B-2, and PAL before the end of the 1969
field season.
25 April-4 May, 1970 —completed second sampling with the taking of stations A-3, COOK, A-4, A-5, A-6', BAILLY, AB-1,, B- B-6, B-7', ZION,
C-6, and C-7.
Third sampling cruise
7 May-11 June, 1970 —all survey stations were reoccupied for the third time.
RESUME OF SAMPLES
Of the 100 stations planned for the summer and fall of 1969, 85 were taken.
Of these 85 station samples, 34 were complete stations at which we collected:
sediments for radioactivity (R), for neutron activation (NA), and for atomic
absorption analysis (AA); water for R, NA, and AA (the NA and AA were Millipore
filtered); phytoplankton for R, NA, AA, and for biologic count and identification (Biol.); zooplankton for R, NA, AA, and Biol.; and benthos for R, NA, AA,
and Biol. A sediment sample for R was taken at each station with the exception
of station F-6 which could not be sampled on one occasion (giving a total of 84
R samples). There would have been 34 samples of each of the remaining samples
had bad weather not necessitated the pooling of all but the Biol. samples from
stations KEW and PTB (giving a total of 33 samples for each parameter other
than the Biol. portion which was collected from both the KEW and PTB locations
and therefore totaled 34). One bottle of NA water leaked away reducing this
total to 32.
During the spring 1970 cruises the 13 stations not occupied for the second
time during the 1969 field season were taken twice to produce the station total
of three separate samples.
The remaining 37 stations which had been occupied twice during the 1969
field season were occupied for the third time during the spring 1970 cruise
with the exception of stations E-4 and E-5 which were cancelled due to bad
weather. This gave a total of 61 sample stations taken during the spring 1970
cruise from which 25 stations supplied a complete spectrum of samples with the
exception of station PTB from which no samples of phytoplankton, zooplankton,
or benthos were secured for R, NA, and AA analysis (giving a total of 24 samples
for these parameters). This portion of the PTB station was again combined with

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