l = Si02 (median size 17/xm) 

 2=Si02 (median size 6.2/i.m) 

 3=Patuxent River Silt 

 4= Fuller's Earth 



20 



£ 30 

 5 40 



OD 



50 



.E 60 



c 70 



9) 



0. 80 



90 



95 



99 

 cfi 4 



/i.m62.5 



5 

 31.3 



6 



7 



8 



9 



15.6 



7.8 



3.9 



1.95 





Stokes' 



Diameter 





10 

 0.98 



II 

 0.49 



Figure A-1. Particle-size distribution of sediments, 



43 



