Figure 3. Chronological profiles of chemical concentrations in sediment cores 



2000 

 1990 

 1980 

 1970 

 1960 

 1950 

 1940 

 1930 

 1920 

 ro 1910 

 >■ 1900- 



1890- 



1880- 



1870- 



I860- 



1850- 



1840 



1830- 



1820 



1810 



1800 



Southern California 



Finney and Huh (1989) 



tPAH 



00 5 1 1 5 20 25 30 3 5 40 45 5 



Concentration relative to 1845 



Puget Sound 



Bates etal. (1984) 



4000 



tPAH (ng/g-dry) 



2000 -, 



1990- 



1980 



1970- 



1960- 



03 



^ 1950- 



1940- 



1930 



1920 



1910 



1900 



Puget Sound 



Crecelius and Bloom (19i 



2000 



1990 



1930- 



1920 



1910- 



1900 



Southern California 



Eganhouse and Kaplan (1988) 



0.0 05 10 15 20 2 5 30 35 40 45 50 5 5 50 



Concentration relative to 1940 



20 40 60 80 100 120 



tPDT (nq/g-dry) 



13 



