CAPPING- 



I I I Mill 



I I I I I 



1 10 100 



TIME, DAYS 



Figure 2. Comparison of compression test curves 



after 1 day of settling was different for all tests because the zone settling 

 velocities were different. The potential capping sediment sample settled 

 faster the first few hours than the upper estuary composite and hot spot sed- 

 iment samples, causing the capping sediment to exhibit compression settling at 

 a greater solids concentration with time (Figure 3). 



Zone Settling Tests 



28. Zone settling velocities for the upper estuary composite sample 

 were determined for each of the zone tests, i.e., for each solids concentra- 

 tion. Depth to interface and the corresponding time intervals were entered 

 into a plotting routine used to determine the zone settling velocity 

 (Tables 4-15) . The zone settling velocities were recorded, along with the 

 corresponding slurry concentrations. These data were then entered into 

 ADDAMS, except the zone settling velocities with high slurry concentrations, 

 i.e., 128.6, 148.6, 167.4, and 181.3 g/JU The zone settling velocities were 



14 



