3.3 REMOTS® Sediment-Profile Photography 
July 1985 Survey 
Most of the sediment surface consisted of medium to very 
fine sands (Figure 3-11). Sorting appeared to be poor; several 
subordinate grain-size modes (both finer and coarser) were mixed 
into these sediments. In addition, these surface sands were 
superimposed over silt-clay muds (>4 phi) throughout much of the 
site. It is possible that subsurface mud extended over the whole 
area. If the surface sand layer was thicker than the camera prism 
penetration depth, only the surface grain-size was apparent in the 
photographs. In general, the finest sediments (very fine sand) 
were located along the northern and southern boundaries of the 
area. Local patches of coarse sand and cobble-sized (<-1 phi) 
sediment were located in the center of the disposal site. This 
coarse material may have represented dredged material. Two large 
areas predominated by fine to medium sands were located in the 
northern and southwestern portions of the survey area (Figure 3- 
aLal)) Strong kinetic gradients could occur along the borders of 
these regions. 
,Photographs from four stations in this survey indicated 
the presence of dredged material (Figure 3-11). Only one station 
(F-13), exhibiting a buried RPD layer (indicative of a dredged 
material deposit), was located outside the disposal site. However, 
dredged material could have been more widespread than indicated. 
Due to the relatively coarse nature of sediments at the New London 
site, REMOTS® prism penetration was shallow (i.e., less than 8 cm) 
at many stations. Consequently, buried redox layers were not 
evident in the photographs at stations G-7 and G-9 (Figure 3-11). 
Two regions, the southwest and northeast corner of the surveyed 
area, exhibited highly reduced sediments (Figure 3-12). This 
reflected either the presence of dredged material or high natural 
organic enrichment. 
Most of the boundary roughness values for the stations 
at New London ranged from 0.2 to 1.6 cm (Figure 3-13). Roughness 
values greater than 0.8 cm represent stations where large 
disarticulated mollusc shells, many fouled by epifauna, occurred 
on the bottom. These stations were located near the western and 
southern edges of the surveyed area. 
The observed RPD values were low compared with other 
DAMOS sites. Fifty-eight stations exhibited no or extremely 
shallow (i.e., less than 1 cm) RPD's (Figures 3-13 and 3-14). 
These sites were concentrated along the northern edge and in the 
southeast corner of the surveyed area. These shallow RPD depths 
appeared to be related to low concentrations of dissolved oxygen 
in bottom waters. This hypoxic bottom-water condition likely 
represented the "August Effect" (Rhoads and Germano, 1982): high 
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