Table 1. Chemicals discussed in this report 



Elements: 



As, Cd, Cu, Hg, Ni, Pb, Se, Zn 



Goups of Organic Compounds: 



ZPCB = sum of concentrations at each level of chlorination or, equivalently and since 1988, twice 

 the sum of concentrations of these 18 congeners; 



PCB 8+PCB 1 8+PCB28+PCB44+PCB52+PCB66+PCB 1 1 +PCB 1 05+PCB 1 1 8+PCB 128+ 

 PCB 1 38+PCB 1 53+PCB 1 70+PCB 1 80+PCB 1 87+PCB 1 95+PCB206+PCB209 



SDDT = sum of concentrations of ortho and para forms of parent and metabolites; 

 opDDE+ppDDE+opDDD+ppDDD+opDDT+ppDDT 



XCdane = sum of concentrations of four compounds; 

 alpha-chlordane+trans-nonachlor+heptachlor+heptachlor-epoxide 



ZDieldrin = sum of concentrations of two compounds; aldrin + dieldrin 



XBT = sum of concentrations of parent compound and metabolites; 

 monobutyltin+dibutyltin+tributyltin (concentrations in terms of tin) 



XPAH = sum of concentrations of 24 compounds*; 



naphthalene+ 2-methylnaphthalene+ l-methylnaphthalene+ biphenyl+ 2,6-dimethylnaphthalene+ 

 acenaphthene+ acenaphthylene + l,6,7-trimethylnaphthalene+ fluorene+ phenanthrene+anthracene+ 

 l-methylphenanthrene+ fluoranthene+ pyrene+ benz[a]anthracene+ chrysene+ 

 benzo[&]luoranthene+ benzo[^]fluoranthene+ benzo[f]pyrene+ benzo[a]pyrene+perylene+ 

 dibenzanthracene+ indeno[l,2,3-c^pyrene+ benzo[^/zz]perylene 



* Six of these compounds did not begin to be measured until 1988. Analysis for trends in tPAH 

 concentrations have not used data from 1986 or 1987. 



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