community, and sediment textural characteristics. 

 Photodocumentation was conducted using 35mm still camera apparatus. 

 A diver-operated epibenthic net was utilized to sample the smaller 

 species in abundance along the photo transects. Table 2-1 presents 

 a summary of the dives conducted at CLIS . The Appendix presents 

 photographs from the diver transects at each mound. 



2.7 Bottom-mounted Instrumentation Array (DAISY) 



The bottom-mounted instrumentation array deployed at the 

 NLON disposal site was similar in character to those used 

 previously within the DAMOS Program. The array contained a variety 

 of instruments including a two-axis electromagnetic current meter, 

 two optical transmissometers to monitor suspended material 

 concentrations, temperature-conductivity probes, and a tide and 

 wave gage. Logic control and data recording were provided by a 

 digital data logger. All data were recorded on magnetic tape 

 cassettes which later were converted into standard IBM compatible 

 format for analysis. 



All array instruments were attached to an aluminum 

 framework configured to sample conditions at points approximately 

 1 m above the sediment-water interface. With the exception of the 

 wave gage, all primary array components were sampled four times 

 each hour for a period of 3 minutes and 10 seconds. The wave gage 

 was sampled twice each hour over periods of approximately 17 

 minutes each. This sampling provided 4096 wave measurements and 

 4 measurements of concurrent tidal amplitude. The wave gage and 

 the primary data logger operated from independent time bases. No 

 attempt was made to provide a common standard. 



The bottom-mounted instrumentation array was located 

 along the southern margin of the New London disposal site (Figure 

 2-2) . Pre-deployment bathymetric surveys indicated that the depth 

 contours in the area were relatively smooth and gave little 

 indication of obstructions sufficient to affect the near-bottom 

 flow regime. Water depth at the deployment station was 

 approximately 2 5 meters. Sediments were predominantly fine-grained 

 sandy silts containing moderate concentrations of organic 

 materials. There was no evidence of recent dredged material 

 disposal at the deployment location. 



3 . RESULTS 



3 . 1 Bathymetry 



Results of the analysis of the large bathymetric survey 

 (50 m lane spacing) covering the entire CLIS site (Figure 3-1) 

 indicated the location of the ten disposal mounds. Comparison with 

 the same survey conducted in September 1984 did not reveal any 

 large-scale changes in the bottom topography. The surveys at the 



