66 



survey did not detect changes in topography over the area since 1984. The mound detected 

 at the 1989 buoy location was detected previously on the northern boundary of the 1984 

 survey. The thin distribution of dredged material detected in the 1989 REMOTS® survey 

 was attributed to a combination of the small volume of material disposed, the water depth, 

 and the wide watch circle of the conventionally moored disposal buoy (Figure 6-36). The 

 barge logs also recorded release points up to 150 m away from the buoy location (Figure 6- 

 37). 



The irregular, rocky, and steep-sided topography of PDS contributes to the 

 containment of dredged material within the site. However, given the depth of PDS, and the 

 use of a conventionally moored buoy, the accumulation of dredged material would not be 

 expected to be as concentrated as in shallower, more protected disposal sites. 



6.5.3 References for Section 6.5 



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. 



SAIC. 1990j. Monitoring cruise at the Portland Disposal Site, January 1989. DAMOS 



Contribution No. 78 (SAIC Report No. SAIC-89/7560&C80). US Army Corps of 

 Engineers, New England Division, Waltham, MA. 



DAMOS Summary Report, 1985-1990 



