Mijf.'iit; F,v<^li!ation of (:• ii cu'venKfs and Cntnpliancfi 
P^ob^^^rr rormu=dt:n 
Exposure 
Sources & 
Pathways 
Ecological 
Critical 
E fleets of 
Species and 
Concern 
Endpoints 
Population & 
Community 
Dynamics 
T oxicant 
Conceptu al 
E cosystem 
Properties 
Model 
Properties 
Loading 
M agnitude 
ST 
Loading 
Distribution 
S 
.... 
Fate and 
Speciation, 
Receptor 
T ransport 
Partitioning 
Distribution 
< >• ••••«•>•••« •• •• . .. 
.. ... 
^Analysis 
Toxicological and Ecological 
Data 
Organism 
Response 
Population 
Dynamics 
Spatially- 
distributed 
Response 
Exposure Profile 
Response Profile 
(Temporal^patial/Form Distribution) 
(As Function of Exposure Distribution) 
Figure 8. Ecological risk assessment framework (modified from EPA 1992). 
80 
