Use of Hanford waste water ponds by waterfowl

Census and environmental surveillance information on waterfowl that use the Hanford Site 200 Area waste water ponds are described and evaluated. Physical features of the ponds are discussed in relation to their use and suitability for waterfowl. Seasonal distributions observed for the years 1971 through 1974 indicate that the highest use by waterfowl occurs during the spring and fall migratory periods. Base population estimates are 300 to 400 resident waterfowl with a few tens of pairs nesting during the summer. Environmental surveillance data on 137Cs in muscle tissue are presented for the years 1971 through 1977. Comparisons are made between Columbia River and waste water pond waterfowl, between waterfowl groups, and among ponds. Waterfowl collected from ponds frequently have easily detected levels of 137Cs in muscle tissue. However, those waterfowl collected from the Columbia River seldom show a 137Cs level above that expected from worldwide fallout. Waterfowl collected from the pond with the smallest 137Cs inventory and the poorest waterfowl habitat contained the lowest levels of 137Cs in muscle tissue