retention time beyond 40 hr provides little additional improvement in superna- 

 tant suspended solids concentration. 



31. The hot spot material supernatant suspended solids at the 2-ft 

 ponding depth settled more efficiently than the upper estuary composite and 

 potential capping sediments, resulting in a slightly lower supernatant solids 

 concentration (Figure 12). In other words, better suspended solids removal is 

 possible with hot spot material as compared with upper estuary composite sedi- 

 ment at a given retention time. Actual field suspended solids will be greater 

 because of resuspension by wind and wave action. The resuspension factor is 

 approximately 1.5, depending on ponding depth and surface area (Palermo 1985). 



Evaluation of Polymers for Chemical Clarification 



32. Both qualitative and quantitative test observations were made dur- 

 ing each test procedure. Qualitative observations included floe size and cap- 

 ture of fines. Quantitative observations included initial suspended solids, 



1 00 1 50 



RETENTION TIME, HR 



Figure 12. Supernatant suspended solids curve at 2-ft 

 ponding depth 



24 



