PART IV: APPLICATION OF RESULTS TO CONCEPTUAL DESIGN OF A 

 TYPICAL CONFINED DISPOSAL FACILITY 



Sediment Characteristics 



38. Sediment characteristics of the dredged material are important in 

 the design of a CDF. A grain size distribution curve of the upper estuary 

 composite sample is shown in Figure 14. The typical sediment characteristic 

 values for the upper estuary are listed below. 



Sediment Characteristic 

 Initial water content 

 Specific gravity 

 Initial void ratio 

 Liquid limit 

 Percent sand 



Upper E stuary Composit e 

 110 

 2.5 

 2.8 

 105 

 43 



Predominant Unified Soil Classification System classifications are organic 

 silts and clays (OH and OL) with silty sands (SM) . 



Typical Project Conditi ons 



39. Preliminary design of a CDF also requires knowledge of specific 

 project conditions. The dredge production rate, dredge flow rate, site capac- 

 ity, dike height, sediment storage depth, ponding depth, and freeboard depth 

 are needed. For the purpose of illustrating how to use the information devel- 

 oped in this study, the following project conditions are assumed: (a) the 

 dredging equipment is expected to dredge at an effective production rate of 

 800 cu yd/day; (b) site capacities of 100,000 and 300,000 cu yd represent the 

 available range; (c) the dredged material slurry flow rate is 3,200 cu yd/day 

 for a slurry concentration of 125 g/£; and (d) the dike, storage, ponding, and 

 freeboard depths are 12, 8, 2, and 2 ft, respectively. 



27 



