displacement pump into an 8-in.-diam, 6-ft column, with ports at 0.4-ft inter- 

 vals beginning at the 5.4-ft depth (see Figure 1). Before the slurry was 

 mixed, salinity of the site water was measured to be 26 ppt. After the slurry 

 was thoroughly mixed and pumped into the column, six samples for total solids 

 were extracted from ports at 5.4-, 5.0-, 4.0-, 3.0-, 2.0-, and 1.0-ft levels. 

 The average total solids concentration for the slurry was determined to be 

 130 g/A. 



15. The hot spot sediment and potential capping sediment slurry con- 

 centrations were determined in the same manner. Sediment solids concentra- 

 tions were 381 and 600 g/l for each sample, respectively. The average total 

 solids concentrations for these slurries when placed in the column were deter- 

 mined to be 134 and 109 g/£, respectively. 



Compression test 



16. The depth to the interface was measured every 15 min for the first 

 13 hr. Thereafter, for 15 days, depth to the interface was measured at daily 

 intervals. 



Zone test 



17. A series of zone settling tests were run on the upper estuary com- 

 posite sediment at solids concentrations ranging from 50.0 to 181.3 g/£. 

 After loading the column, the depth to the interface was read every 15 min. 

 The total solids concentration was determined from six samples extracted from 

 ports at 5.4-, 5.0-, 4.0-, 3.0-, 2.0-, and 1.0-ft depths immediately after 

 loading. Each zone test ran for approximately 5 or 6 hr. From the plots of 

 the depth to interface (feet) versus time (hours) , zone settling velocities 

 were determined. 



18. The zone test was not run on the hot spot or potential capping sed- 

 iment samples. It was determined that the zone settling velocity of the upper 

 estuary composite sediment was not the controlling design parameter for the 

 CDF. This relationship was determined from the information that the initial 

 storage area exceeded the minimum area needed for zone settling. Experience 

 with other marine sediments also contributed to this decision. 



Flocculent test 



19. Flocculent settling tests were performed concurrently with the com- 

 pression settling test on the same slurry. Therefore, the flocculent test 

 slurry concentrations are the same as the compression test slurry concentra- 

 tions. For the upper estuary composite sediment, samples of the supernatant 



