3. WATER 3.1 TAP WATER New York City tap water has been sampled since August of 1954. Daily samples are pooled to obtain a total volume of about 100 liters for the monthly period. Results are tabulated in Table 16 and are plotted in Fig. 8. 0.337- 90.30 9.25 0.104 -—]-|—— —_—— >7. — |} 0054 Fig. 8—Sr™ in New York City tap water. Earlier samples have been reported from both the University of Chicago and the Lamont Geological Observatory. The results of these analyses are presented in Table 17. 3.2 RIVER, PRECIPITATION, AND RESERVOIR WATER As part of a study in marine waste disposal being conducted by the Agriculture and Mechanical College of Texas, samples of river water from the Mississippi drainage system were analyzed for Sr™. Additional water samples were collected at the southwest pass of the Mississippi Delta. The results are shown in Table 18. Data obtained on surface waters at the laboratories of the University of Chicago and the Lamont Geological Observatory are shown in Table 19. 3.3 SEA WATER The area of the oceans is much greater than that of the land masses; therefore a large fraction of fallout is probably deposited in the sea. The sea is a mobile system, and deposition 48