rather than lateral transport. For example, Station 19 had a 

 surface layer of mud over sand apparently related to the presence 

 of dredged material (Figure 3-7) . Sand over mud at stations 17 and 

 32 may also be related to disposal events (Figure 3-8; see section 

 3.4 below). The disposal site center (station 1) consisted of 

 rippled bedforms and fine sands which limited penetration by the 

 REMOTS® camera (Figure 3-5) . 



The small-scale boundary roughness frequency distribution 

 for the disposal site showed a major mode at 1.0-1.4 cm (class 3) 

 with values as high as 2.6-3.0 cm (class 7; Figure 3-9). The mean 

 was 1.10 ± 0.56 cm (n=100) . The origin of this roughness was 

 related largely to the presence of rippled bedforms in the sandy 

 facies and biogenic (bioturbational) features in the mud facies. 

 On dredged material, small-scale boundary roughness can also be 

 related to the presence of gravel deposited at the site. 



The boundary roughness frequency distribution for the 

 reference stations indicated a major mode at 0.6-1.0 cm (class 

 2), and a mean of 0.80 ±0.43 cm (n=27; Figure 3-10). Boundary 

 roughness values at the disposal site were significantly greater 

 than the reference areas (p<0.05, Mann-Whitney test). Reference 

 areas were located in areas with a lower kinetic energy regime 

 (i.e., fewer bedforms) and lacked dredged material. 



3.2.2 Distribution of Dredged Material 



The "footprint" of past disposal at the Buzzards Bay 

 site was determined primarily from REMOTS® photos; the presence of 

 dredged material was indicated by chaotic sedimentary fabrics and 

 anomalous grain size distributions at the site (Figure 3-11) . The 

 bathymetric survey showed a 60 m wide mound at the center of the 

 site with a height of 1.2 m. The distribution of dredged material, 

 as deduced from REMOTS® photographs, extended well beyond this 

 mound. Dredged material extended at least 100 meters west and 200 

 meters east of the mound apex. Most of the area occupied by 

 disposed material was located south of the mound apex (to at least 

 200 meters south). Station 28, located 200 meters south and west 

 of the mound, was apparently located on a second 1.6 meter-high 

 mound of dredged material. 



3.2.3 Mean Apparent RPD Depth Distributions 



Steep spatial gradients existed between the disposal 

 site, where most RPD values fell between 2 and 4 cm, and the three 

 reference areas, where most values were greater than 4 cm (Figure 

 3-12) . The mean apparent RPD depths for the reference areas were 

 significantly greater than those for the disposal site (p<0.05, 

 Mann-Whitney, Figure 3-13) . The mean value for reference stations 

 was 5.7 ± 2.14 cm while the mean apparent RPD depth distribution 

 for the disposal site was 3.43 ± 1.25 cm. 



