u_ 



differentiate between the dredged material and the ambient bottom reflectors. However, a 

 slight rise in the seafloor could be detected near the disposal location (Figure 3-5). 



On the subbottom record, what appear to be sand ripples are located on the western 

 flanks of the disposal mound (Figure 3-6). Their amplitude ranges from approximately 

 30 cm in lane 4 to less than 20 cm in lane 10. The larger ripples extend approximately 

 150 m along the slope northwest of the disposal location. Closer to the disposal location, 

 the ripples are less than 20 cm in amplitude and are concentrated in a swath less than 

 100 m wide (Figure 3-7). Larger waves with amplitudes of approximately 50 cm are 

 located on the slope of the depression in the southeast corner of the survey (Figure 3-7 and 

 Figure 3-8). 



Bathymetric and Subbottom Survey at the Cornfield Shoals Disposal Site, July 8, 1994 



