85 



PDS Grab Samples Mineralogy Means 



Coarse/ -i c 

 Abundant 



Medium/ -i 

 Common 



Fine/ 

 Rare 



0.5 



Ave. Grab Sample 



Grain size 



■ Blacl< porous material 

 EaDarl< minerals 



□ Flyash 



B Fibrous minerals 



□ Rock fragments 



□ Insect parts 



13 Plant fragments 



□ Benthic Diatoms 



■ Planktonic Diatoms 

 S Textured Ostracods 



□ Smooth Ostracods 



□ Pellets 



□ Shell fragments 



13 Gastropod fragments 

 Q Bryozoan fragments 



Figure 4-19. ffistogram displaying mean abundance (rare, common, abundant) and particle 

 size (fine, medium, coarse) for the mineralogical components within the fine 

 fi-action of grab samples collected during the precap (pseudo-UDM) survey 



The Portland Disposal Site Capping Demonstration Project, 1995-1997 



