conducted by C. R. Environmental that confirmed some of the monitoring observations and 

 provided visual evidence of the surface of the CAD cell. 



The acoustic and coring survey was planned and implemented to assess the success 

 of capping for two objectives of equal importance: 



• to verify coverage of the first CAD cell and locate areas potentially requiring additional 

 cap material; 



• to provide a resource for operational and monitoring modifications for application to 

 the remainder of the BHNIP. 



The results of the monitoring survey presented here indicated that the majority of the 

 CAD cell was capped with a highly variable thickness of sand, but that the southern end had 

 little or no cap material. Postcap operations designed to level the sand cap appeared to have 

 resulted in highly uneven sand coverage, and potentially served to enhance mixing of the cap 

 and underlying dredged material. The acoustic data suggested that unsupported cell walls had 

 become less steep, and provided evidence that consolidated blocks of material had fallen from 

 the walls and settled on top of the dredged/cap material. Finally, the sediment placed in the 

 cell (maintenance material and cap) had continued to consolidate, resulting in a topography 

 that grossly mimicked the topography of the cell floor. 



MONITORING RESULTS FROM THE FIRST BHNIP CONFINED AQUATIC DISPOSAL CELL 



