4.4 Capped Mound Coring Study: 

 Conclusions 



The coring investigation at CLIS was 

 conducted to test several of the hypotheses 

 formulated during the experimental 

 capping projects at CLIS. Results 

 indicated that 



• Cores showed very clear chemical 

 and visual boundaries, presumably 

 between original mound and cap 

 material; 



• Silt caps deposited on silt mounds 

 are apparently just as effective at 

 containing contaminants as sand 

 caps deposited on silt; and silt caps 

 deposited on silt mounds may cause 

 less disturbance than sand-on-silt; 



• Clamshell dredging may preserve 

 some of the stratification, texture, 

 and contaminant distribution from 

 the original deposit. 



Sediment Capping of Subaqueous Dredged Material Disposal Mounds 



