organic compounds with a log octanol-water partition coefficient 

 greater than or equal to 2.3 were recommended by Tetra Tech (1985a) 

 for inclusion in EPA Section 301(h) (Clean Water Act) monitoring 

 programs. EPA priority-pollutant metals are listed in Table 2 in 

 descending order of bioaccumulation potential, according to their 

 BCF (Tetra Tech 1985a). 



TABLE 2. Inorganic Priority Pollutants Ranked According to 

 Bioconcentratlon Factor (BCF) 



Priority 



Pollutant No. Substance log BCF^ 



4.602 

 4.602 

 3.447 

 3.073 

 2.762 

 2.544 

 2.513 

 2.253 

 2.190 

 2.104 

 2.000 

 1.699 

 1.176 

 ND 

 ND 

 ND 

 ND 

 ND 

 BCF = Bioconcentraction Factor. The value shown is the geometric mean BCF 



among studies summarized by Tetra Tech (1985a). U.S. EPA (1986h) provides 



additional information on BCF values for selected chemicals. 



ND = No data. 



Screening of potential contaminants of concern should be done on a 

 case-by-case basis during preparation of risk assessments. When data 

 on concentrations of contaminants in edible tissues of fishery or- 

 ganisms are available, preUminary calculations of potential risks may 

 be made to rank chemicals by relative priority for detailed evaluation. 

 If contaminant concentration data are available for soils, air, and water 

 (at a hazardous waste site, for example), U.S. EPA (19860 methods 

 for selecting indicator chemicals for public health evaluations at Su- 

 perfund sites may be used to gain perspective on contaminants of 

 concern. For potential carcinogens, the qualitative weight of evidence 

 for carcinogenicity should be considered. Those chemicals with suffi- 

 cient evidence of carcinogenicity in humans should generally be con- 

 sidered as contaminants of concern. 



Toxicity profiles are summaries of the following information for the 

 selected chemicals of concern: 



• Physical-chemical properties (e.g., vapor pressure, octanol- 

 water partition coefficients) 



Toxicity Profiles 



19 



