Figure 7. Annual concentration of total PCB in mussels at NS&Tsite at Palos Verdes, CA. 



clearly the effects of human activity 

 from natural influences on chemical 

 concentrations. 



ACKNOWLEDGMENTS 



The NS&T Mussel Watch samples have 

 been gathered and analyzed by the 

 Battelle laboratories in Duxbury, MA, 

 and in Sequim, WA; the Texas A&M 

 University Geochemical and Environ- 

 mental Research Group in College Sta- 

 tion, TX; and the La Jolla, CA, labora- 

 tory of Scientific Applications Interna- 

 tional Corporation. Appreciation is due 

 the several scientists who took the time 

 to review draft versions of this report. 



REFERENCES 



Goldberg, E.D., M. Koide, V. Hodge, 

 A.R. Flegal, and J. Martin. 1983. U.S. 

 Mussel Watch: 1977-1978 results on 

 trace metals and radionuclides. Estua- 

 rine, Coastal and Shelf Sci. 16: 69-93. 



Hayes, S.P. and P.T. Phillips. 1987. 

 California State Mussel Watch Ma- 

 rine Water Quality Monitoring Pro- 

 gram 1965-86. Wat. Qual. Mon. Rpt. 

 87-2WQ, California. Water Research 

 Control Board, Sacramento, CA 58 pp. 

 (More recent data in Figure 4 supplied 

 directly to A. J. Mearns by CA Mussel 

 Watch). 



27 



