3e
Water
321
Sr?° in Tap Water - New York City
New York City tap water has been analyzed since August 195i.
Until the end of November 1956, the sampling period lasted about two
weeks during which time an average of 50 liters was collected (3-4
liters per day).
Since December 1956, the collections are made over
a period of a month and the total volume
is about 100 liters.
‘The
atrontium 90 content in ppo/liter is shown in Table 10 for collections
made in 1957 and 1958.
Data for collections carried out before 1957
have been presented in HASL=l,2 entitled "“Envirommental Contamination
from Weapon Tests".
Data for all samples analyzed are presented
graphically in Figure 6,
The error term depicts one standard deviation
due to the error in counting.
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