activities. As in the 1988 REMOTS® survey, stations near the "A", "B", and "C" 

 disposal mounds had discontinuous sand layers buried at depth, representing relic 

 dredged material (Figure 3-12). Reference area grain size data varied from station to 

 station, with notable differences occurring in some replicate photographs at the 

 same station (Figure 3-13). Several stations within the 2000S reference area 

 exhibited poorly-sorted sediments with layering of sand and mud (Figure 3-14). 



The frequency distribution of apparent RPD depths for WLIS and pooled 

 reference REMOTS® stations had major modes in the 3.0 to 4.0 cm class interval, 

 with a mean of 3.3 and 3.8 cm, respectively (Figure 3-15). This represented a 

 significant difference in the distribution of RPD values at the two areas (Mann- 

 Whitney U-Test, p = 0.03). Disposal site stations with a mean apparent RPD depth of 

 less than 3.0 cm were primarily southwest and northeast of the "D" mound and in 

 the vicinity of the WLIS "A" and "C" mounds (Figure 3-16). Mean apparent RPD 

 depths near the "B" mound increased since the 1988 REMOTS® survey to greater 

 than 3.0 cm. Numerous on-site stations (200NE, 200SE, 200S, 200SW, and 200W) and 

 several stations within the "2000S" and "WLIS-REF 1 reference areas had relic RPD 

 layers buried at depth (Figures 3-17 and 3-18). 



Approximately 50% of all replicate photographs within the WLIS Disposal Site 

 contained evidence of Stage III infaunal taxa (Figure 3-19). The majority of stations 

 exhibited combinations of Stage I on III and Stage III seres, with the exception of a 

 small cluster of stations to the west and north of the disposal point which exhibited 

 exclusively Stage I infaunal taxa. Several stations located on and adjacent to the "D" 

 mound exhibited rapid recolonization of the recently-deposited dredged material by 

 Stage III infauna, characterized by feeding voids at depth (Figure 3-20). 

 Approximately 63% of all reference station REMOTS® photographs (N = 107) 

 provided evidence of Stage III infaunal activity, compared to 61% (N = 36) in the July 

 1988 survey. Only 6 of 39 reference stations had exclusively Stage I in all replicate 

 photographs, whereas all other stations had combinations of Stage I on III, Stage III, 

 and/or Stage I seres. 



The frequency distribution of Organism-Sediment Index (OSI) values for the 

 on-site stations (Figure 3-21) had major modes at the +5 and +11 class intervals. 

 Approximately 53% of the WLIS stations had OSI values of < +6 (Figure 3-22). The 

 majority of these stations were close to the disposal mounds, although stations on 

 the apex of the "D" and "B" mounds had an OSI value of +11. The median OSI value 

 for the reference stations was +9, with a major mode at the +11 class interval (Figure 

 3-21), and differed significantly from OSI values calculated for disposal site stations 

 (Mann-Whitney U-Test, p = 0.01). OSI values calculated for the 1988 reference 

 stations had a major mode at the +11 class interval. 



3.3 CTD and Dissolved Oxygen Sampling 



Winkler titration determined DO concentrations of near-bottom water 



Monitoring Cruise at the Western Long Island Sound Disposal Site 



