10-3- 



OC 10-^- 

 HI 



CD 5 



LU 



F 10'5- 

 u. 



10-6- 



10 



,-7 



STUDY AREA 



N- 25 BUTTER CLAMS 



/ 



~\^V. 



REFERENCE AREA 

 N = 25 BUTTER CLAMS 



1 

 (2) 



10 

 (25) 



1 00 g/day 



(250) (meals/yr) 



CONSUMPTION RATE 



PCBs Weight-of-evidence classification: 

 PROBABLE HUMAN CARCINOGEN [B2] 



All cancer risks are plausible-upper- limit estimates of excess risk based on 

 linearized multistage procedure and assumptions suimarized in the text. Solid lines 

 are risks associated with average PCB concentrations in butter clams. Dashed lines 

 are for uncertainty range (e.g., 95 percent confidence limits) for average 

 concentrations of PCBs, not the total uncertainty. Actual risks are likely to be 

 lower than those shown above and may be zero. 



Figure 7 Example graphic format for display of quantitative risk 



assessment results for hypothetical study area and reference 

 area. 



