1.0 INTRODUCTION 



The Western Long Island Sound Disposal Site (WLIS) is located 2.5 nautical 

 miles north of Lloyd Point, NY between the Stamford and Eaton's Neck historic 

 disposal grounds. Since disposal first began at the site in March 1982, varying 

 quantities of dredged material have been deposited annually. As a result, four 

 dredged material disposal mounds currently exist at the site (Figure 1-1). 



The disposal buoy was south of the "C" mound at coordinates 40° 59.2 54'N 

 and 73° 29.095W during the 1989 - 1990 disposal period. Barge estimates indicated 

 that 185,044 m 3 of dredged material were disposed near the buoy during this time. 



Field operations at WLIS were initiated on 12 July, 1990 to provide 

 information on the fate of recently-disposed dredged material and to assess the 

 environmental effects of past and recent disposal operations. Field operations 

 included two bathymetric surveys, REMOTS® sediment-profile photography, near- 

 bottom dissolved oxygen determination, and sediment chemistry and grain size 

 sampling. The objectives for the 1990 monitoring cruise at WLIS were to: 



• delineate the areal extent and topography of the dredged material 

 deposited since the July 1988 survey and determine the stability of 

 disposal mounds formed prior to the July 1988 survey 



• assess the extent of recolonization at the WLIS disposal mounds and 

 monitor the ambient benthic infaunal successional stages present 

 within the three reference areas; 



• assess near-bottom dissolved oxygen concentrations relative to 

 REMOTS® benthic analyses at and near the disposal site; 



• provide additional baseline information on sediment chemistry and 

 grain size at each reference station and at the disposal site; and 



• provide a detailed bathymetric survey of the entire WLIS Disposal Site. 



Monitoring Cruise at the Western Long Island Sound Disposal Site 



