m 



percentage of samples appropriately classified into the pre-determined groups. 



Discriminant statistical analyses of both the mineralogic composition and the 

 microfossil assemblage classified 95 % of the core samples correctly according to the 

 designated layer. The graphs display three clusters of core samples which were described 

 by two canonical discriminant functions (Figure 4-34). The first function presents the 

 largest difference in the sample group based on the multi-variable composition, which 

 clearly separated the AMB material from the disposed dredged material. The second 

 function determines the next largest difference between the layers; the pseudo-UDM and 

 CDM were more closely associated, though distinguishable. Similar to the MDS 

 ordination plot, the microfossil discriminant scores showed denser clusters with greater 

 distances between layer means than the mineralogy. The mean values for each layer 

 (CDM, pseudo-UDM, ambient) was marked. The top samples of pseudo-UDM, from 

 cores with more than one pseudo-UDM sample, are marked on the graph and tended to be 

 close to the CDM cluster on both graphs. 



The Portland Disposal Site Capping Demonstration Project, 1995-1997 



