the survey center and along the upper portions of the east and west 

 borders (Figure 3-3) . Dredged material was observed at 62% of the 

 disposal site stations and was located principally in the central 

 and southern areas. This material extended as far as some stations 

 along the eastern, southern, and western borders of the REMOTS® 

 grid (Figure 3-3) . 



Fine sands (3-2 phi) and very fine sands (4-3 phi) were 

 the most prevalent grain sizes on the disposal site, whereas very 

 fine sands (4-3 phi) were the major grain size mode at the 

 reference stations (Figure 3-6) . Stations north of the disposal 

 site center and along the eastern and western borders had finer 

 grain sizes than central and southern stations. The coarsest 

 sediments (medium sands, 2-1 phi) were found at the center of the 

 survey grid. 



The grain size major modes of the disposal site and 

 reference stations were significantly different (p < 0.05, Mann- 

 Whitney U-test) . The northern reference station (REF-1) yielded 

 few photographs with sufficient penetration, indicating a hard 

 bottom. The second reference station (REF-2) was positioned 

 northwest of the main REMOTS® grid and generally consisted of very 

 fine sand (4-3 phi) . Bed formations were visible at the sediment 

 surface in most photographs taken at REF-2 . These features were 

 similar to bed forms at the central and southern portions of the 

 disposal site (Figure 3-7) . Reference station 3 (REF-3) was 

 positioned south-east of the main survey grid and consisted of 

 mostly very fine sand (4-3 phi) and some fine sand (3-2 phi) , with 

 no bed forms present. 



Mean apparent Redox Potential Discontinuity (RPD) depths 

 ranged from 1.3 to 5.5 cm over the entire disposal site (Figure 3- 

 8) . In comparison with the reference stations, RPD depths were 

 significantly shallower for disposal site stations with measurable 

 dredged material present (p < 0.05, Mann-Whitney U-test) (Figure 3- 

 9 ) . Mean RPD depths of the reference stations ranged from 2.4 to 

 6.3 cm. 



Infaunal successional seres in the central and southern 

 regions of the disposal site were generally either Stage I or Stage 

 I on III (Figure 3-10) . To the north and along the eastern and 

 western borders, Stage II and Stage II on III were the dominant 

 seres. The reference stations consisted principally of either 

 Stage I on III at REF-2, or Stage II and Stage II on III at REF-3. 

 Large infaunal burrows (some as long as 9 cm) were present in 

 REMOTS® photographs taken at both the disposal site and the 

 reference stations (Figure 3-11) . 



The distribution of median Organism-Sediment Index (OSI) 

 values was patchy but generally lower (4-8) in the central and 

 southwest region of the disposal site, and higher (9-11) in the 

 north and along the northeast and northwest borders (Figure 3-12) . 



