14 



detailed discussion of the bathymetric analysis technique is provided in the DAMOS 

 Navigation and Bathymetry Reference Report (Murray and Selvitelli 1996). 



2.3 REMOTS® Sediment-Profile Photography 



REMOTS® photography was used to detect the distribution of dredged material 

 layers, map benthic disturbance gradients, and monitor the benthic infaunal recolonization 

 and/or successional status of the NHAV 93, CLIS 94, and FVP mounds relative to the 

 CLIS reference areas. Cross-sectional photographs of the top 20 cm of sediment were 

 taken for analysis and intercomparison with the adjacent CLIS reference areas. 



Three replicate photographs were taken at thirteen stations over each of the three 

 disposal mounds (Figure 2-1). The REMOTS® sampling grids over the disposal mounds 

 formed a cross-shaped pattern with three stations along each of four arms and one station 

 in the center. The REMOTS® survey over the NHAV 93 mound was centered at 

 41°09.122' N, 72°53.453' W with station spacing at 200 m. The CLIS 94 and FVP grids, 

 centered at 41°09.343' N, 72°53.099' W and 41°09.390' N, 72°51.750' W, respectively, 

 were based on the same cross-shaped pattern, but sampled every 100 m (Figure 2-1; 

 Appendix A: Table 2-1). 



Data from three reference areas (CLISREF, 2500W, and 4500E) were used for 

 comparison of ambient central Long Island Sound sediments relative to the sediments 

 deposited at CLIS through disposal operations. Reference areas 2500W (41°09.254' N, 

 72°55.569' W) and 4500E (41°09.254' N, 72 50.565' W) were sampled at four randomly 

 selected stations. CLISREF (41°08.085' N, 72°50.109' W) was sampled at five randomly 

 selected stations (Figure 2-1; Appendix A: Table 2-1). 



2.4 Geotechnical Coring 



The geotechnical coring operations completed on 28 and 29 August were the final 

 replicates collected for the NHAV 93 project. A total of eleven sediment cores were 

 collected from seven stations oriented to produce a cross-section of the NHAV 93 mound. 

 The cores were obtained in an SAIC and University of Rhode Island (URI) joint effort. 

 The sampling scheme was centered on the NHAV 93 buoy position (41°09.122 ? N, 

 72°53.453' W). Cores GC-1 through GC-5 and GC-8 through GC-11 were taken in a 

 northeast-southwest transect across the NHAV 93 mound. Cores GC-6 and GC-7 were 

 obtained on a northwest-southeast transect of NHAV 93 mound (Figure 2-3; Appendix A: 

 Table 2-2). 



Monitoring Cruise at the Central Long Island Sound Disposal Site, September 1995 



