LIST OF FIGURES (continued) 



Page 



Figure 4-4. Three-dimensional view of the August 1995 Royal River Project Area 

 (NAD 27) depicting natural features in the central disposal location, 

 1.0 m contour interval (MLLW) 61 



Figure 4-5. Bathymetric chart of the February 1996 1950 m x 1000 m survey 

 area (NAD 27) over the southern region of Portland Disposal Site 

 relative to the project area and disposal area boundary, 2.0 m contour 

 interval (MLLW) 63 



Figure 4-6. Three-dimensional view of the February 1996 survey area over the 

 Portland Disposal Site depicting the rough, irregular bottom 

 topography, 1.0 m contour interval 64 



Figure 4-7. Characterization of ambient sediments and dredged material within 

 the Royal River Project Area, as detected by the February 1996 

 REMOTS® camera survey 65 



Figure 4-8. REMOTS® photographs collected from stations 100 NW and 50 NW 

 during the February 1996 survey showing the appearance and 

 thickness of Harraseeket River material 66 



Figure 4-9. Planview images obtained from stations 100 NW, CTR, and 50 SE 

 showing differences in surface conditions and sediments in close 

 proximity to the central disposal point 68 



Figure 4-10. Results from the side-scan sonar survey performed over the southern 



region of the Portland Disposal Site in February 1996 70 



Figure 4-11. Side-scan sonar data from February 1996 survey lanes 20 and 24 

 overlaid with bathymetry showing rapid changes in depth due to 

 bedrock outcrops 71 



Figure 4-12. Depth difference plot of the November 1996 UDM survey versus the 

 February 1996 baseline survey (NAD 27) showing apparent 

 accumulation of pseudo-UDM in close proximity to the PDA buoy, 

 0.25 m contour interval 72 



