8" 



\PORTABLE\ 

 MIXER 







'! 



\\ DREDGED 

 \\ MATERIAL 

 \Y SLURRY '* 



I 



POSITIVE- 

 DISPLACEMENT 

 PUMP 



mm£ 



ti 



— o- 



^m 



-o- 



vim 



mtv 



■ VAL VES FOR SAMPLE 

 EXTRACTION 



SETTLING COLUMN 

 Figure 1. Schematic of the settling column 



POROUS STONE 



were extracted with a syringe at 5.0-, 4.7-, 4.4-, 4.0-, 3.8-, 3.5-, 3.0-, and 

 2.8-ft depths above the interface at different time intervals (1.5, 3.5, 6.0, 

 12.0, 24.0, 48.0, 97.0, and 192 hr) . For the hot spot material, samples of 

 the supernatant were extracted with a syringe at 5.4-, 5.0-, 4.4-, and 4.0-ft 



10 



