Table 5 Stepwise multiple regression analyses for Ussue trace metal 

 concentrations involving the variable "disposed volume. * = 

 tne amount of variance in the trace metal concentration ex- 

 plained by the model. Variable code: L = shell length, W/D = 

 wet/dry tissue weight ratio, T = temperature, D = disposal volume, 







WLISc 



Stations 



500MW 







Metal 



Variables 





X 





X 





Cr 



1 



W/D 



65.1 



W/D 



52.6 







2 



L 



73.6 



L 



58.1 







3 



D 



88.8 









Cu 



1 



W/D 



47.7 



W/D 



24.8 







2 



L 



66.0 



L 



40.0 







3 



T 



79.2 



T 



77.3 







4 







D 



91.9 





Fe 



1 



W/D 



71.0 



W/D 



29.8 







2 



L 



84.1 



I 



43.8 







3 



T 



95.6 



T 



87.3 







4 



D 



97.4 



D 



95.3 





Ni 



1 



W/D 



6.5 



W/D 



43.7 







2 



L 



11.0 • 



L 



60.7 







3 







T 



78.3 







4 







D 



88.3 





Disposal volume (D) as a variable was not entered in the other multiple 

 regression models dealing with Cd, Co, Hg, Zn, and V. 



28 



