58 



1990, REMOTS® sediment-profile results identified a patch of fresh dredged material within 

 a relatively large area of relic dredged material (Figure 6-31). The wide and thin distribution 

 of dredged material at CSDS may be due to both tidal action and barge release point 

 distribution (Figure 6-32). 



6.4.2 CSDS: 1990 Monitoring Results 



In July 1990, SAIC conducted field operations at CSDS to assess areal distribution of 

 dredged material deposited since the previous July 1987 monitoring survey and to verify the 

 usefulness of REMOTS® sediment-profile photography as a survey tool at this site. Field 

 operations included a 1000 x 1000 m bathymetric survey and a 13-station REMOTS® 

 survey. 



According to the barge logs, 104,000 m 3 of material were deposited at CSDS between 

 1987 and 1990. Volume calculations based on the 1990 and 1987 bathymetric surveys 

 showed that an estimated 16,600 m 3 of dredged material had accumulated at the site. The 

 remaining material was presumably too thin to be accounted for using bathymetric volume 

 estimation methods. 



As a result of the high energy regime at CSDS, no significant changes in topography 

 (e.g., the development of distinct disposal mounds) were detected in consecutive bathymetric 

 maps. REMOTS® photography, however, did detect fresh and/or relic dredged material at 

 several stations, supporting the utility of REMOTS® technology to track dredged material 

 distribution at CSDS. Enlargement of the REMOTS® grid to incorporate stations outside of 

 the dredged material dispersion area (where ambient bottom conditions persist) would assist 

 future monitoring efforts at the site. 



6.4.3 References for Section 6.4 



SAIC. 1988a. A summary of DAMOS physical monitoring of dredged material disposal 



activities. SAIC Report No. SAIC-88/7527&C71. Final report submitted to US Army 

 Corps of Engineers, Waterways Experiment Station, Vicksburg, MS.. 



Germano, J. D.; Parker, J.; Christiansen, C. 1994. Monitoring cruise at the Cornfield Shoals 

 Disposal Site, July 1990. (SAIC Report No. SAIC-90/7597&C91). Submitted to US 

 Army Corps of Engineers, New England Division, Waltham, MA. 



NUSC. 1979. DAMOS disposal area monitoring system annual data report: proceedings of 

 symposium, 14-15 May 1979. Naval Underwater Systems Center, Newport, RI. 



DAMOS Summary Report, 1985-1990 



