1 . INTRODUCTION 



The Central Long Island Sound (CLIS) disposal site 

 (Figure 1-1) has been under study by the New England Division (NED) 

 since 1974. Several experiments have been conducted at the CLIS 

 site to assess the impact of dredged material disposal on the 

 surrounding environment and to determine the effectiveness of 

 capping contaminated dredged material. 



Monitoring efforts have continued throughout the DAMOS 

 program to document recolonization of the site as well as document 

 changes in the sediment characteristics. The field operations 

 conducted at the Central Long Island Sound disposal site in August, 

 1985 were designed to accomplish the following objectives: 



■ assess the impact of previous dredged material disposal 

 operations (with special emphasis on the MQR mound) and 



■ characterize the southeast quadrant of CLIS, in terms of 

 sediment type and possible presence of dredged material, 

 in order to identify a location for future experiments 

 that will not be influenced by dredged material disposal 

 elsewhere at CLIS. 



The tasks required to accomplish these objectives 

 included precision bathymetry, REMOTS® sediment-profiling, side 

 scan sonar, sediment sampling for physical, chemical, and 

 biological analysis, and visual observations. 



With the occurrence of Hurricane Gloria in September 

 1985, additional field studies were performed to address the 

 following objectives: 



■ verify the containment qualities of the CLIS disposal 

 site after exposure to storm conditions and assess the 

 stability of the disposal mounds. This was accomplished 

 with precision bathymetric surveys and REMOTS® sediment- 

 profiling at STNH-N, STNH-S, CS-1, CS-2, and MQR disposal 

 mounds in October. 



■ document the physical interaction between the water 

 column and disposed dredged material in Long Island Sound 

 before, during, and after the passage of the storm. This 

 task was accomplished by deploying a bottom-mounted 

 instrument array known as the Disposal Area In-situ 

 System (DAISY) at the New London (NLON) disposal site. 



The passage of Hurricane Gloria in September provided a 

 rare opportunity to document any significant storm-associated 

 changes in the characteristics of the disposal mounds at the CLIS 

 site as well as to monitor the response of the sediment-water 



