Finally, we have very little information as to which chemicals or groups 
of chemicals are causing the observed effects. More and more circum¬ 
stantial evidence suggests the aromatic hydrocarbons are involved with 
some types of effects. Without firm knowledge however, the regulatory 
agencies must make educated guesses concerning which chemicals are the 
"bad actors" that must be removed from the Sound. 
References 
Long, E. R. and R. M Chapman. 1986. A sediment quality triad: Measures 
of sediment contamination, toxicity, and infaunal community 
composition in Puget Sound. Mar. Pollu. Bull. 16(10):405-415. 
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