Figure 4. — Location of sampling stations and gold tracer drop zones in the Cape Fear River. 



salinity of 24 %o, temperature of 18° C, and 

 pH of 7.9. 



Animals and sediment from the drop zone area 

 were collected before and after the release of the 

 labeled sediment. Samples of sediment and sea 

 water, and of blue crabs; Atlantic croaker; star 

 drum, Stellijer lanceolatus: flounder, Paralichthys 



sp.; and American menhaden, Brevoortia tyrannus, 

 were collected 1 week prior to the first drop in 

 order to measure background activity. Orga- 

 nisms and sediment were collected again on the 

 third day following the release of the labeled 

 sediment. In addition to those species collected 

 before the release of labeled sediment, the white 



RADIOACTIVE GOLD USED AS A SEDIMENT TRACER 

 774-711 O — 66 10 



433 



