cores were combined and placed into bags for subsequent chemical 

 analysis. The fourth sample was saved for physical analysis. The 

 samples were kept cold (at approximately 4°C) and submitted to the 

 NED laboratory. The parameters measured included sediment grain 

 size, trace metals (As, Cd, Cr, Cu, Pb, Hg, Ni, Zn) , total organic 

 carbon (TOC) , polychlorinated biphenyls (PCBs) , pesticides and 

 polycyclic aromatic hydrocarbons (PAHs) . Analytical methods were 

 those of the U.S. Environmental Protection Agency (EPA, 1987). 



3.0 RESULTS 



3 . 1 Bathymetry 



Depths in the area surveyed at Buzzards Bay Disposal Site 

 ranged from 8.2-14.4 m (Figure 3-1). An 11.6 m contour separated 

 the survey area into a northwest quadrant with depths ranging from 



8.2 - 11.6 m and a southeast quadrant with depths up to 14.4 m. 



In general, the disposal site consisted of small 

 topographic elevations. The REMOTS® survey, taken in conjunction 

 with the bathymetric survey, assisted in determining the nature of 

 these elevations, i.e., whether they were natural or man-made. 

 Three mounds were included in both the bathymetric and REMOTS® 

 surveys: 1.) a center mound, 1.2 m high and approximately 60 m 

 wide, 2.) a mound to the southwest, 1.6 m in height and about 90 

 m in diameter, and 3.) a mound, west and north of center, 1.2 m in 

 height and 100 m in diameter. All three mounds exhibited a steeper 

 slope to the southeast. 



3.2 REMOTS® Sediment-Profile Photography 



3.2.1 Major modal grain size and boundary roughness 



The major modal grain size over the surveyed area ranged 

 from medium sand (2-1 phi) to silt-clay (>4 phi) (Figure 3-2) . The 

 coarsest sediments, consisting of patches of fine to medium sands 

 intermixed with some silt-clay, were located at reference area 1 

 and at the REMOTS® stations located in the northwest quadrant of 

 the surveyed area (Figure 3-3) . The finest sediments were located 

 in the southeast quadrant of the disposal site, reference area 2, 

 and reference area 3 (Figure 3-4) . This transition occurred along 

 the 11.6 m isobath. 



All stations containing a major mode of medium (2-1 phi) 

 and fine sand (3-2 phi) fractions were rippled (Figure 3-5) . 

 Several stations showed the superposition of sand over mud, 

 suggesting that the net sediment transport in this region was from 

 the northwest (sand source) to the southeast (mud area) . This was 

 particularly apparent in reference area 2 (Figure 3-6) . While this 

 statement generally holds true for the mapped area, individual 

 stations showed evidence of stratigraphy related to disposal events 



